APM765 Series: Universal Input with Alarm Panel Meter

The APM765 Panel Meter displays data collected from process current, DC voltage and temperature inputs. Several output options convert the display into a transmitter with proportional 4-20mA output or a serial communication interface. A relay output option adds limit alarm and pump control capabilities.

Process inputs can be scaled with or without applying an input for virtually any engineering units. Temperature inputs can be programmed to display in degrees Fahrenheit or Celsius.

Inputs
4-20mA DC, ±20mA DC, ±10V DC
Type J, K, T, E thermocouples
100 ohm platinum RTDs

Outputs (optional)
4-20mA (sink/source)
Dual SPDT (Form C) 3A relays
RS-232, RS-422/485 serial communication

Power Requirements
Standard unit: 85-265V AC or 90-265V DC
Optional: 12-24V AC or 12-36V DC

Operating Temperature: 0 to 65°C

Approvals: CE marked, UL, cUL listed

DC Process and Temperature Inputs

The APM765 Panel Meter is factory calibrated to accept 4-20 mA, ±10 VDC, Type J, K, T, E thermocouples and 100 ohm platinum RTDs. Process inputs can be scaled with or without applying an input for virtually any engineering units. Temperature inputs can be programmed to display in degrees Fahrenheit or Celsius and a type K thermocouple can display up to 2300°F.

Current/Voltage Input
Setting up the panel meter to accept a current or voltage input is very easy. All setup steps are performed by push-buttons or through software so there are no switches or jumpers to adjust.

Thermocouple/RTD Input
Setting up the APM765 Panel Meter to accept thermocouple or RTD input is simply a matter of setting a switch at the rear of the case and selecting the input type from the menu.
Meters accept J, K, T, or E type thermocouples as well as two, three, or four-wire 100 ohm platinum RTDs.

Serial or Modbus Output
The APM765 Panel Meter can be used as a data acquisition device, with the added benefit of a digital display, by connecting an optional RS-232 or RS-422/485 serial communication adapter.
Acromag offers MeterView software for simple data acquisition and to program the meter.

Serial Communications

Meter Address: Modbus protocol: 1 – 247 (default 247)
Baud Rate: 300 – 19,200 bps (default 2400)
Transmit Time Delay: Programmable between 0 and 199mS or Transmitter always on for RS422 communication (default 10mS)
Data: 8 bit (1 start bit, 1 stop bit)
Parity: None, even, or odd (default even)
Byte-to-Byte Timeout: 0.01 – 2.54 seconds (default 0.01 seconds)
Turn Around Delay: Less than 2mS (fixed)

MeterView Software

MeterView software enables PC programming of the APM765 and sets up data logger operation.

Remote Programming
MeterView software allows all setup parameters to be programmed from a PC and saved to a file for reporting or programming other meters.

Data Acquisition
MeterView software provides a convenient way to collect the data generated from the serial output of up to 100 panel meters. The user can select the logging time interval and the engineering units that will be displayed on the computer screen. Data is written to a file that could then be imported into a spreadsheet or other application.

Performance Specifications

Specifications apply to operation at 25°C.

General

Display: 0.56”(14.2 mm) red leds. Four digits (-1999 to 9999)

Display Intensity: Eight user-selectable intensity levels

Front Panel: Nema 4x, ip65. Panel gasket provided

Programming Methods: Four front panel push buttons, pc and meterview software, or cloning with copy feature.

Noise Filter: Programmable between 2 – 199 (0 will disable filter)

Display Update Rate: 1.8-2.5/sec for tc input or 3.7-5/sec for process/rtd

Overrange and Underrange: Display flashes 9999 (over) or -1999 (under)

Max/Min Display: Stored until reset by user or meter is turned off

Non-volatile Memory: All programmed settings are stored in nonvolatile memory for a minimum of ten years if power is lost.

Power:
AC: 85-265 VAC, 50/60 Hz, 20 VA
DC: 90-265 VDC, 20 W
Option: 12-36 VDC or 12-24 VAC

Required Fuse: Ul recognized, 5a max, slow blow (up to six meters may share one fuse)

Normal Mode Rejection: 64 db at 50/60 hz

Isolation
Input or output to power line: 4kv
Input or output to p1 or p2: 500v
Input to output: 500v
p1 to p2: 500v

Environmental
Operating range: 0 to 65°c (32 to 149°f)
Storage range: -40 to 85°c (-40 to 185°f)
Relative humidity: 0 to 90% non-condensing

Connections
Power & signal: removable screw terminal blocks accept 12 to 26 awg.
Serial: rj11 header, standard on all meters.

Enclosure: 1/8 din, high impact plastic, 94v-0, color; gray

Weight: 8 oz (227 g) (no options)

Process Inputs

Inputs: Field Selectable: ±20 Ma Dc and ±10 VDC

Accuracy: ±0.05% Of Calibrated Span ±1 Count, Square Root: 10-100% F.S.

Low-Flow Cutoff: 0 To 9999 (0 Disables Cutoff Function)

Decimal Point: Up to Three Decimal Places: d.ddd, dd.dd, ddd.d,or dddd

Calibration: Internal or External Signal or with PC

Calibration Range: User Programmable Over Entire Range of Meter

Input Impedance
Voltage Range: Greater Than 1m Ohms
Current Range: 50-100 Ohms

Input Overload: Protected by Automatically Resettable Fuse

Temperature Drift: ±50 Ppm/°C

Transmitter Supply
Isolated, one or two transmitter supplies (optional)
p1 (-1 option): 24 vdc ±10% @ 200ma max
p1/p2 (-2 option)
p1: 24 vdc ±10% @ 200ma
p2: 24 vdc ±10% @ 40ma

Temperature Inputs

Inputs: Factory calibrated, field selectable: type J, K, T, or E thermocouples and 100 ohm. platinum RTD (0.00385 or 0.00392 curve).

Resolution: 1°; type T, 1° or 0.1°

Accuracy:

Type        Temperature Range                     Accuracy
J             -58 to 1382°F (-50 to 750°C)           ±2°F (±1°C)
K            -58 to 2300°F (-50 to 1260°C)         ±2°F (±1°C)
T          -292 to 700°F (-180 to 371°C)           ±2°F (±1°C)
E            -58 to 1578°F (-50 to 870°C)            ±2°F (±1°C)
RTD    -328 to 1382°F (-200 to 750°C)         ±1°F (±1°C)

Cold Junction Reference: Automatic

Temperature Drift: ±2°C maximum, 0 to 65°C ambient temperature

Offset Adjustment: Programmable to ±19.9°. This allows the user to apply an offset value to the temperature being displayed.

Input Impedance: Greater than 100k ohms

Sensor Break:
All relays and alarm status LEDs go to alarm state.
Analog output may go to pre-programmed state.
Display will flash.

Relays

Rating: 2 SPDT (form C); rated 3 amps @ 30 VDC or 3 amps @ 250 VAC resistive load; 1/14 HP @ 125/250 VAC for inductive loads.

Deadband: 0-100% of full scale, user selectable

High or Low Alarm: User may program any alarm for high or low

Relay Operation:
1. Automatic (non-latching)
2. Latching
3. Pump alternation control

Relay Reset:
User selectable via front panel buttons or PC
1. Automatic reset only (non-latching)
2. Automatic + manual reset any time (non-latching)
3. Manual reset only, at any time (latching)
4. Manual reset only after alarm condition has cleared (latching)

Automatic reset: Resets when input passes reset point

Manual reset: Front panel ACK button

Time Delay: 0 to 199 seconds, on and off delays; programmable

Fail-Safe Operation:
Programmable, independent for each relay.
Relay coils are energized in normal condition.
In case of alarm or power failure, relays will go to de-energized state.

Auto Initialization: When power is applied to the meter, relays will reflect the state of the input to the meter.

Isolated 4-20mA Output

Output Range:
1.00 to 23.00mA typical
Scalable for 0.00 to 23.99mA
Factory calibrated for 4-20 mA

Accuracy: ±0.1% F.S. ±0.004 mA

Temperature Drift: 50 PPM/°C from 0 to 65°C ambient.
Note: Analog output drift is separate from input drift.

Output Loop Resistance:

Power Supply        Minimum    Maximum
24 VDC                          10 ohms         700 ohms
35 VDC (external)    100 ohms        1200 ohms

Output Maximum Load: R_load (max) = (V_supply – 10V) / 0.020A

External Power Range: 10-35 VDC