# Application Notes

### How to Excite a 2-wire, 4-20mA Continuous Level Sensor & Provide 2 Relay Outputs for Pump Down with High Alarm – 8400390

Pump Down with High Alarm This document illustrates how to use the APM765-6R2-10 for exciting a 2-wire, 4-20mA continuous level sensor, and provide two relay outputs. One relay for pump down and one relay for high alarm with automatic or manual reset. Defining the Problem: Need to excite a 2-wire, 4-20mA continuous level sensor, and…

### How to Create a 4-20mA Output Proportional to Flow Rate – 8400304

Problem: A flow sensor has a non-linear reversed output. Solution: Create a 4-20mA output proportional to flow rate using the following Acromag transmitter and software products: Model: 811T-0500 DC to DC Isolated Transmitter Model: 800C-SIP Software Interface Package Optional: PS5R-D24 Power Supply The 811T offers a 25 break-point table for sensor linearization. Input percentage is…

### How to Monitor RTDs for Temperature Differential – 8401008

Defining the Need: Monitor three RTDâ€™s on a stack and transmit two differential 4-20mA signals representing -7 to 18Â°F. Each RTD transmitter is calibrated -20 to 120Â°F. Solution: Model 892M-0500 math module (qty. 3) Model 800C-SIP software interface pkg. (qty. 1) ModelÂ PS5R-VD24 power supply (qty. 1)   Download PDF for complete application note.

### How to Calculate a V-notch Weir Discharge Rate Q (GPH) – 8401009

Defining the Need: Calculate the discharge rate Q (g.p.h.) output of a V-notch weir. Provide a 4-20mA output for flowrate and frequency output for totalization and alarm output for high-level alarm. Solution: Model 892M-0500 DC output math module Model 895M-0800 freq. output math module Model 800C-SIP software interface package Optional: Model PS5R-VD24 power supply  …

### How to Transmit the Dosing Percentage of an Additive Based on Total Flow of Effluent – 8401006

Defining the Need: Transmitting the dosing percentage (ratio) of an additive based upon total flow of effluent. Solution: Model 892M-0500 dual-input math module Model 800C-SIP software interface package Optional: Model PS5R-VD24 power supply

### How to Take the Square Root and Sum up to Four 4-20mA Signals from Flow Sensors – 8401005

Defining the Need: Taking the square root and summing up to four 4-20mA signals from flow sensors. Solution: Model 894M-0500 quad-input math module Model 800C-SIP software interface package Optional: Model PS5R-VD24 power supply

### How to Scale and Sum up to Four 4-20mA Signals from Flow Sensors – 8401004

Defining the Need: Scaling and summing up to four 4-20mA signals from flow sensors. Solution: Model 894M-0500 quad-input math module Model 800C-SIP software interface package Optional: Model PS5R-VD24 power supply

### How to Use a Toroidal AC Current Sensor – 8401044

Using Acromagâ€™s Toroidal AC Current Sensor Model 5020-350 Transmitters with DC current input can be used in conjunction with an external toroidal AC current sensor in order to precondition an AC current input signal. This sensor is a highly accurate toroidal instrument transformer; which converts an AC current signal to a safe, low-level, DC milliampere…

### How to use Thermocouple Transmitters to Monitor Temperatures in Paint Systems – 8400818

This document illustrates using Acromag’s TT330 Series to monitor high temperatures in an automotive paint curing oven and transmit to the existing PLC 4-20mA input card/software setup. Defining the Problem The area around an auto manufacturerâ€™s paint curing ovens is at elevated temperatures affecting the performance of locally installed instrumentation. Placing Signal Conditioners rated for…

### How to Split Gas Detector Outputs for Monitoring & Process Control – 8400861

Defining the Problem: At a remote wastewater pumping station, Methane (CH4) and Hydrogen Sulfide (H2S) are monitored with MSA X5000 Gas Monitors. The 4-20mA outputs must be split to a GasCard XL Controller and Emerson Ovation I/O. The Controller has powered inputs, but the Ovation inputs require an external power source. Typical splitters have two…