
Frequently Asked Questions
Q1: How do I select the right 4-20mA isolator for my application?
Q2: Why is my IntelliPack module's 4-20mA output different than I expected or different from the configuration software's "Test Page" values?
Q3: Why am I having trouble communicating with an IntelliPack module from my notebook computer?
Q4:Which operating systems are compatible with IntelliPack and BusWorks configuration software?
Q5: Do you have a 4-20mA Isolator that can handle a 24V DC power supply on the input and output side?
Q6: Does Acromag offer any of the following outputs: +/-10V DC, +/-15V DC, 0-15VDC, 0-20VDC, or 0-30V DC?
Q7: Does Acromag offer an Analog Input to Pulse-Width Modulated Output device?
Q8: I don’t see a product to fit my needs. What should I do?
Q9: Does Acromag offer one Thermocouple (TC) input to two isolated 4-20mA outputs? It needs to be accurate, linearized, and economical.
Q10: What’s an accurate, rugged and low-cost method to read a lot of Thermocouples or RTD’s remotely from my PC, PLC, DCS, or Controller?
Q11: I need to monitor a 0-1mA input. What product(s) do you suggest?
Q12: Do you support 125V DC powered signal conditioning?
Q13: What are the advantages to using a PC-programmable transmitter?
Q14: Do you have a fast acting Frequency Alarm unit that responds in 150ms or so? The application is for an "overspeed" shutdown device monitoring a magnetic pickup on a gas turbine. The input frequency is 0-12000hz.
Q15: Does Acromag have a module that will select the higher or lower of incoming signals?
Q16: Do you have a device that cross-references for JAQUET FTW 1613 AC 230, 47 - 63 Hz, 84 - 264 VAC. Pulse - Current signal conditioner?
Q17: Can I us a Cu RTD 10 ohm @ 25 DegC with the 658T transmitter?
Q18: Does Acromag have a solution for a non-linear response curve or the monitoring of only a portion of an incoming analog input signal?
Q19: Is it possible that my firewall or proxy server is interfering with communication to my BusWorks 900EN Ethernet I/O Modules?
Q20: What is your new i2o feature for the Ethernet products?
Q21: What are Acromag’s quality control procedures?
Q22: Does Acromag supply or recommend a supplier for metal samples that can be used with the Model 1101 Metal Tester product?
Q23: I have an application involving drum level signals at a power plant. Could one of your Intellipack modules take in three two-wire transmitter inputs and output the median value signal?
Q24: Does Acromag's Ethernet I/O products w/ Modbus TCP/IP protocol work NI's Labview 8.2 using NI's Modbus TCP/IP driver?
Q25: Do you know if National Instruments has a Modbus TCP/IP Driver for Labview 7.1 and 8.2? Will the drivers work with Acromag's Ethernet I/O using Modbus TCP/IP protocol?
Q26: Do you have a "Low Signal Clamp" 4-20mA isolator that will hold the output at 4mA if the input drops below 4mA? Our customer's existing isolator output tracks the input to zero, but our governor will fault whenever the input drops below 2 mA. The isolator also needs to source the output current. It cannot be powered off the output loop. The customer has 115 VAC power available.
Q27: I have an application involving drum level signals at a power plant.Could one of your Intellipack modules take in three two-wire transmitter inputs and output the median value signal?
Q28: Does Acromag have an amplifier that can interface with Delphi Manifold Air Temperature Sensors (Thermistor) # 12110446 or # 15326386 and can provide an accurate 4-20mA output?
Q29: Does Acromag have a 2ch, 4-20mA input, "Low Selector" Instrument with a broken input wire detection feature that will clamp the output to 4mA if I lose both inputs? I have a Thermal Oxidizer and need to monitor/control using the lowest of two 4-20mA signals coming from my temperature transmitters. If either loop breaks open, I need to pass thru the active loop. However, if both loops break open, I need the output to clamp at 4mA.
Q30: Do you have a product with a 1-5V DC input, frequency output (0 to 10hz) and on-board programmable relay? I’m replacing an old valve positioner system. I have a 1-5V DC "error correction signal" and need to convert it to 0 to 10hz in such a way that 3 to 5V DC or 3 to 1V DC equals 0 to 10Hz (ie; absolute value). If possible, I need the frequency output to have a duty cycle less than 50% (ie; on-time is approximately 50mS to 100mS only). Next, I need a relay output that will trip when I’m above 3V DC or below (ie; a direction signal output). I’d like a 2% deadband around 3V DC on both the relay and before updating the frequency output.
Q31: Will a Hart Communicator work on a loop that simply has a Rosemount 3051 Smart Transmitter and the input of an Acromag 653T-0600 4-20mA isolator/splitter? I’m re-transmitting the 4-20mA signal thru the Acromag splitter but am having connection problems with my Hart Communicator on the input side.
Q32: Do you have a “Peak Picker” transmitter/solution that can scan a 4-20mA input and provide a 4-20mA output that will hold the peak value if the input drops out? I need a response time of around 160mS or less. Lastly, I need 12Vdc power if available.
Q33: If you can’t view the Acromag website, try the following.
Q34: How do I order an Acromag Model 4683-TTM-1F for a Johnson Controls system that requires a special UL864 approval?
Q35: Does Acromag recommend a USB to RS232 or RS485 converter that works well with the 800C and 900C Software Packages for Windows XP and Vista Operating Systems?
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A1: How do select the right 4-20mA isolator for my application?
Very often the simple task of choosing an isolator requires more than just comparing the number of channels and the cost per point. To help you with this exercise, here are a few concepts to know when specifying a 4-20mA isolator. pdf 179KB
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A2: Why is my IntelliPack module's 4-20mA output different than I expected or different from the configuration software's "Test Page" values?
Check your wiring on Terminal Block #3 (TB3). The white jumper used for voltage outputs should be removed when current outputs are required.
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A3: Why am I having trouble communicating with an IntelliPack module from my notebook computer?
Try running your notebook PC from battery power. Sometimes the noise generated by the AC outlet power supply can interfere with serial port communications.
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A4: Which operating systems are compatible with IntelliPack and BusWorks configuration software?
Acromag's configuration software packages are compatible with Windows 95, 98, 2000, ME, NT, XP.
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A5: Do you have a 4-20mA Isolator that can handle a 24V DC power supply on the input and output side?
Yes. For this application requirement you’ll need an "output loop powered" isolator with a passive 4-20mA input. See Acromag’s 651T, 652T, 250T-C1, or the 15xT transmitters. Also, see application note #1.
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A6: Does Acromag offer any of the following outputs: +/-10V DC, +/-15V DC, 0-15V DC, 0-20V DC, or 0-30V DC?
Yes. Contact the factory regarding your input and output requirements. Acromag has special 450T models designed for these unique output ranges.
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A7: Does Acromag offer an Analog Input to Pulse-Width Modulated Output device?
Yes. See Model 895M-0800 (single channel) or Model 896M-0800 (dual channel). These units offer programmable "Duty Cycle" or PWM outputs.
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A8: I don’t see a product to fit my needs. What should I do?
Try 4 things: Check the FAQ’s or Knowledge Base, call Acromag’s Sales Department at 1-800-881-0268 or use the Contact Us form or send an e-mail to sales@acromag.com. Please provide your contact information for quickest available service. We’ll be glad to assist.
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A9: Does Acromag offer one Thermocouple (TC) input to two isolated 4-20mA outputs? It needs to be accurate, linearized, and economical.
Yes. You can use Acromag’s Model 656T-0600 (universal dual channel TC transmitter). Calibrate both channels the same and turn the sensor break detection off on one channel. When wiring the inputs, simply bring your TC wire to the Ch1 input and jump over to Ch2 using the same TC wire.
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A10: What’s an accurate, rugged and low-cost method to read a lot of Thermocouples or RTD’s remotely from my PC, PLC, DCS, or Controller?
If you’re converting to an analog signal, go with 4-20mA and see Acromag’s Model 656T-0600 (dual channel TC xmitter) or 658T-0600 (dual channel RTD xmitter). To simplify the design, lower your costs further, and run everything back serially over two wires, see Acromag’s Modbus (924MB or 934MB) or Profibus Network I/O products (965PB or 966PB). For low-cost and "wireless" serial communication, use Acromag’s Modbus I/O and OS2400-485-x wireless modems.
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A11: I need to monitor a 0-1mA input. What product(s) do you suggest?
Acromag’s Model 811T-0500 will support and scale for this input with it’s standard 0-5mA input range. Otherwise, using a precision 1K ohm conversion resistor across the terminals, you can order any model or package that supports a 0-1V DC input. Acromag will supply a resistor(s) for each channel at no-charge when ordered with an instrument. Simply specify P/N 1110-401 (1Kohm, 0.1% 1/8Watt precision resistor). For maximum convenience, order your instrument factory calibrated and set-up for a 0-1V DC input.
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A12: Do you support 125V DC powered signal conditioning?
Yes. Acromag offers a Universal Din Rail Mounted Power Supply, Model PS5R-D24. This supply supports 85 - 264V AC or 105 - 370V DC rails and delivers a 24V DC (2.1A, 50W) output. It’s compact and ideal for use with any standard DC powered instrumentation offered (ie; 10-36V DC typical ratings).
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A13: What are the advantages to using a PC-programmable transmitter?
Acromag's IntelliPack models feature Windows configuration software that reduces setup time, enables precise calibration, archives settings for rapid duplication, and provides visual input/output readings to confirm proper operation. You can even perform custom signal characterization/linearization with 25 break points. Why bother with pots and switches to select I/O types and zero/span settings? See how easy it is to configure an IntelliPack Transmitter as demonstated on our brief video tutorial, Windows Media Player (best viewed in full screen mode).
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A14: Do you have a fast acting Frequency Alarm unit that responds in 150ms or so? The application is for an "overspeed" shutdown device monitoring a magnetic pickup on a gas turbine. The input frequency is 0-12000hz.
Yes. Check out Acromag's Model 942MB-0900, 2 channel Frequency Alarm w/ Modbus-RTU Communications. When configuring the module, the user has the option of selecting the 0-50khz input range along with a programmable gate time between 0.1second and 1second. Also, the unit offers 2 SSR DO's that can act as high and/or low alarms for their respective inputs (response time for the ssr's is better than 5ms). So, you can set this unit up using the 50khz input range, a gate time of 0.1second (100ms), along with a high, failsafe alarm output as needed. The DO's switch up to 48Vdc at 1Amp.
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A15: Does Acromag have a module that will select the higher or lower of incoming signals?
Yes, the 892M-0800 or 894M-0800 Math Modules can easily be programmed to perform a signal selector function. The MIN(n1,n2,...,n5) expression can be used to return the minimum value of two to five channels, numbers, or expressions. Conversely, the MAX(n1,n2,...,n5) expression can be used to return the maximum value of two to five channels, numbers, or expression.
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A16: Do you have a device that cross-references for JAQUET FTW 1613 AC 230, 47 - 63 Hz, 84 - 264 VAC. Pulse - Current signal conditioner?
The closest Acromag solution to the p/n specified would be Acromag's Model 841T-0500. It's a 3-way isolated Frequency/Pulse Xmitting Alarm unit. It's powered by 10-36V DC, however; Acromag offers a universal power supply for wide ranging AC, Model PS5R-B24. If you only need a frequency xmitter, Acromag also offers a 450T-FQ1 product that is AC powered.
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A17: Can I us a Cu RTD 10 ohm @ 25 DegC with the 658T transmitter?
Yes. The 658T is a 2-channel instrument. Both channels have dipswitches to select the type of RTD sensor and 10 ohm Cu is an option. Further, you can calibrate the channels within the range of the sensor type selected.
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A18: Does Acromag have a solution for a non-linear response curve or the monitoring of only a portion of an incoming analog input signal?
Yes, Acromag offers several products that can perform this function.
First, the Intellipack 801T, 811T and 851T Transmitters offer a linearizer function in the transmitter configuration page of the Acromag Intellipack software package. This will linearize different response curves or select a range for a corresponding output signal. Selecting the linearizer option allows the user to enter up to 25 breakpoints to facilitate up to 24 segments of linearization from input to output. Input and output break points are entered in percent and correspond to 0-100% at the input (scaled value) mapped to 0-100% at the output.
Second, the 89xM math modules have the ability to perform mathematical computations on up to 4 analog input signals and provide an isolated analog output response based on the programmed equation. Individual channel scaling for both inputs and outputs and up to a 200 character equation makes the math module very versatile for complex response curves or transfer functions.
Third, the 151T/155H Transmitters also offer a linearizer function in the Transmitter Setup screen of the Acromag Hockeypuck Configuration Software package. By clicking on the Sensor Offset Curve button, the software will allow you to enter up to 22 breakpoints to facilitate up to 21 segments of linearization from input to output.
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A19: Is it possible that my firewall or proxy server is interfering with communication to my BusWorks 900EN Ethernet I/O Modules?
Yes. Many industrial networks use a Proxy Server to create a firewall. With this configuration, the Proxy Server prevents the computer from communicating with the module. If using the Internet Explorer browser, go to the top tool bar and click: Tools / Options / Connections / LAN Settings. Then Uncheck the Proxy Server.
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A20: What is your new i2o feature for the Ethernet products?
i2oTM technology enables direct input-to-output communication without a controller in between! more info
Ethernet i2o technology (PDF, 507KB)is the easiest way to link your inputs to your outputs without a PLC, PC or master CPU. Many BusWorks® 900EN I/O modules now have the ability to operate like a long-distance transmitter. Convert your sensor inputs at Point A to process control signals at Point B. Or, monitor a discrete device at one site by reproducing the discrete level with a relay output at another location.
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A21: What are Acromag’s quality control procedures?
Acromag is committed to provide products of quality that meet the initial and continuing needs and expectations of our customers. Please view this brief Flash video presentation for more information.
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A22: Does Acromag supply or recommend a supplier for metal samples that can be used with the Model 1101 Metal Tester product?
The Model 1101 Metal Tester is a "comparative device" and gives users the ability to create standards using their own "in-house" metal samples. Therefore, metal sample kits are not supplied as accessories for the instrument. However, a suggested source for the purchase of metal samples would be listed below:
Metal Samples Company
A division of Alabama Specialty Products, Inc.
PO Box 8
152 Munford, AL 36268
Phone 256-358-4202
Fax 256-358-4515
Email: msc@alspi.com
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A23:I have an application involving drum level signals at a power plant. Could one of your Intellipack modules take in three two-wire transmitter inputs and output the median value signal?
Yes, Acromag's Model 894M-0500 Quad Input Math Module should work fine. To pass thru the "Median" value, simply add all inputs together (ie; A+B+C) and subtract out the MAX and MIN inputs. Example: Output=A+B+C-(MAX(A,B,C))-(MIN(A,B,C)).
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A24: Does Acromag's Ethernet I/O products w/ Modbus TCP/IP protocol work NI's Labview 8.2 using NI's Modbus TCP/IP driver?
Yes. Here's a tip for Labview 8.2. When you're using NI's Modbus Driver for Labview 8.2 and reading Acromag's Analog Input Registers (ie; Acromag Register Map Address 30013), simply use the last two digits of the register map address and subtract one. For example, if you want to read the channel data at address 30013, type in starting address 30013 in Labview's Modbus Command module. See a picture here.
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A25: Do you know if National Instruments has a Modbus TCP/IP Driver for Labview 7.1 and 8.2? Will the drivers work with Acromag's Ethernet I/O using Modbus TCP/IP protocol?
Yes and Yes. Please see the link below for NI's Modbus TCP/IP driver downloads.
NI's Modbus TCP/IP Driver download for Labview 7.1 and 8.2: http://sine.ni.com/devzone/cda/epd/p/id/4756#1requirements
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A26: Do you have a "Low Signal Clamp" 4-20mA isolator that will hold the output at 4mA if the input drops below 4mA? Our customer's existing isolator output tracks the input to zero, but our governor will fault whenever the input drops below 2 mA. The isolator also needs to source the output current. It cannot be powered off the output loop. The customer has 115 VAC power available.
Yes, Acromag has two solutions. They are:
1. Use a Universal V or I Transmitter with a 3 breakpoint linearizer function:
IntelliPack Model 811T-0500, where:
Input= 0-20mA
Output= 0-20mA
Linearizer Setup as:
Input=0%, Output=20%
Input=20%, Output=20%
Input=100%, Output=100%
2.Use a Math Module with a "Max" Function. Also good for CL1Div2 ABCD Locations:
IntelliPack Model 892M-0500, where:
Input (A) = 4-20mA, Scaled 0 to 100%
Output = 4-20mA, Scaled 0 to 100%
Output Equation = MAX(A,0)
[This equation will pass thru Input A or 0% (ie; 4mA), whichever is higher]
Both solutions are 4-Wire DC Powered devices with sourced current outputs. For AC power, use Acromag’s Universal PS5R-B24 power supply or others in the PS5R family.
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A27: I have an application involving drum level signals at a power plant.Could one of your Intellipack modules take in three two-wire transmitter inputs and output the median value signal?
Yes, Acromag’s Model 894M-0500 Quad Input Math Module should work fine. To pass thru the "Median" value, simply add all inputs together (ie; A+B+C) and subtract out the MAX and MIN inputs. Example: Output=A+B+C-(MAX(A,B,C))-(MIN(A,B,C)).
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A28: Does Acromag have an amplifier that can interface with Delphi Manifold Air Temperature Sensors (Thermistor) # 12110446 or # 15326386 and can provide an accurate 4-20mA output?
Yes. The solution is to use Acromag’s Model 801T-0500-C Universal Temp/ohms/mV Xmitter with 16Bit Sigma Delta A/D’s and D/A’s along with a precision 500 ohm resistor (Acromag p/n 1100-274, 0.1%, 1/2W) for the input. Order as shown below and be sure to specify upon order “Configure for Delphi Manifold Temperature Sensor p/n # 12110446 (or p/n # 15326386). Input 0 to 100C, Output 4-20mA (for example)”. When you receive the units, you’ll wire up to the sensor using a 2-wire Resistance Hook-up and place the 500 ohm resistor across the input +/- terminals (ie; so the resistor is in “parallel” with the sensor).
Order: 1pc, Model 801T-0500-C
1pc, P/N 1100-274
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A29: Does Acromag have a 2ch, 4-20mA input, "Low Selector" Instrument with a broken input wire detection feature that will clamp the output to 4mA if I lose both inputs? I have a Thermal Oxidizer and need to monitor/control using the lowest of two 4-20mA signals coming from my temperature transmitters. If either loop breaks open, I need to pass thru the active loop. However, if both loops break open, I need the output to clamp at 4mA.
Yes. Acromag's Model 892M-0500 Dual Input Math Module and Model 800C-SIP Configuration Software Kit should work fine. See below for the ranging, scaling, equation, and explanation.
Configure and Scale the 892M I/O as follows:
Input A= 0 to 20mA, scaled 0 to 20.000
Input B= 0 to 20mA, scaled 0 to 20.000
Output = 0 to 20mA, scaled 0 to 20.000
OutputEquation=(((A<4)*(B<4))*4)+(((A<4)*(B>=4))*B)+(((A>=4)*(B<4))*A)+(((A>=4)*(B>=4))*MIN(A,B))
Note, the equation above uses conditional logic statements that translate to a mathematical number 1 when true and 0 when false.
The equation performs as follows:
- When A<4mA and B<4mA, output goes to 4mA.
- When A<4mA and B>=4mA, pass thru B to the output
- When A>=4mA and B<4mA, pass thru A to the output
- When A>=4mA and B>=4mA, pass thru Minimum of A or B to the output
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A30: Do you have a product with a 1-5V DC input, frequency output (0 to 10hz) and on-board programmable relay? I’m replacing an old valve positioner system. I have a 1-5V DC "error correction signal" and need to convert it to 0 to 10hz in such a way that 3 to 5V DC or 3 to 1V DC equals 0 to 10Hz (ie; absolute value). If possible, I need the frequency output to have a duty cycle less than 50% (ie; on-time is approximately 50mS to 100mS only). Next, I need a relay output that will trip when I’m above 3V DC or below (ie; a direction signal output). I’d like a 2% deadband around 3V DC on both the relay and before updating the frequency output.
Yes, please review Acromag’s Model 895M-0800 Universal V/I to Freq/Relay Math Module that programs using "spreadsheet" style equations. See below for input ranging, scaling, equations and brief explanation.
Input A: 0 to 5Vdc, scaled -15Hz to +10Hz
Output B (Freq): 0 to 36000CPH w/ prog on-time of 50mS, scaled 0Hz to 10Hz
Output C (SS Switch): Initial Condition=0 (ie; logic 0 = switch open/de-energized, non-zero=switch closed).
Output BEquation(FreqOut): IF(AND(A>=-.2,A<=0.2)) THEN(0) ELSE(ABS(A))
Explanation: If Input A is 0Hz +/-0.2Hz (ie; 3Vdc +/-2%), then output 0Hz, otherwise output the absolute value of input A
OutputC(SSSwitch): (A>0.2)+(AND(A<=0.2,A>=-0.2)*C)
Explanation: If A is greater than 0.2Hz (ie; 3V+2% deadband) then always turn on output relay (C). If A is 0Hz +/-0.2Hz (ie; in the deadband region) and the output relay (C) was on (ie; logic 1) previously, then keep the relay on. If the A input is in the deadband region and output relay (C) was off previously, then keep the relay off (ie; logic 0).
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A31: Will a Hart Communicator work on a loop that simply has a Rosemount 3051 Smart Transmitter and the input of an Acromag
653T-0600 4-20mA isolator/splitter? I’m re-transmitting the 4-20mA signal thru the Acromag splitter but am having connection problems with my Hart Communicator on the input side.
Yes, however, you’ll probably need to add some external series resistance in the loop (ie; 250ohm resistor, 1/2W typical, in series with the Acromag input). Most Hart Transmitters & Hart Communicators require 250ohms of minimum load resistance in the loop. However, most all Acromag 4-20mA isolators/splitters have much lower input impedances (ie; 10 to 150ohms depending on the model). If this is the case, an external resistor in series with the Acromag input should work fine.
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A32: Do you have a “Peak Picker” transmitter/solution that can scan a 4-20mA input and provide a 4-20mA output that will hold the peak value if the input drops out? I need a response time of around 160mS or less. Lastly, I need 12Vdc power if available.
Yes, Acromag has a two module solutions to meet all of these requirements. Actually, Acromag’s Model 895M-0800 (Universal V/I to Freq Math Module) will perform a complete peak picker function in approximately 70mS with a frequency output (ie; 0 to 10,000Hz or less is no problem). To get a 4-20mA output, simply add 1pc of Model 841T-0500 (ie; Freq/Pulse Transmitter) to convert the Frequency output of the 895M back to a 4-20mA signal. Both units work with 10-36Vdc power sources. Click here for an example "peak picker" configuration on an 895M using a 0 to 1000Hz output. The ranging, scaling, output equation, and a brief explanation are included.
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A33: If you can’t view the Acromag website, try the following.
1) Does the Title Bar say “refresh to domain for dev”?
2) Type www.acromag.com/index.cfm in the address bar instead of just www.acromag.com.
If this works, you probably have the Meta Refresh function disabled. Here are the steps to enable it on Internet Explorer.
From the toolbar, go to Tools > Internet Options. Select the Security Tab and click the Custom Level button. Scroll down and enable Meta Refresh
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A34: How do I order an Acromag Model 4683-TTM-1F for a Johnson Controls system that requires a special UL864 approval?
Try calling Johnson Controls Customer Service in Milwaukee at Tel. 800-445-4757. Place an order for JCI P/N NU-RPT101-0
A35: Does Acromag recommend a USB to RS232 or RS485 converter that works well with the 800C and 900C Software Packages for Windows XP and Vista Operating Systems?
Acromag has tested many different USB to RS232 or RS485 units and some don’t work reliably. Below are recommendations on units that have been qualified to work:
1. Quatech SSU2-100, this is a single port USB to RS232 converter. www.qualtech.com
2. Quatech DSU2-400, this is a two channel USB to RS232/RS485 converter. This one is larger in size, but it can go straight to RS485 so an additional converter is not needed for use with the 9xxMB RS485 modules.www.quatech.com
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