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German Biogas Association

EngineSens Motorsensor GmbH

Mannheimer Str. 44 b

E-Mail  info@enginesens.com

D-68519 Viernheim / Germany

phone  +49 6204-986 08 23

fax       +49 6204-986 08 25

Sensing the future

Our Portfolio:

Temperature Probes, Differential Pressure Sensors for Particle Filters, Airflowmeters, NOx-Probes and consultancy regarding Exhaust Gas Purification and Exhaust Gas Sensors.




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Ammonia Monitoring System was introduced at “Sensor + Test 2022” trade fair in Nuremberg

NH3 Transmitter 70591mit LED

Based on a series-manufactured ammonia sensor, EngineSens Motorsensor GmbH developed an NH3 monitoring system consisting of the sensor, a sensor control unit, the wiring harness and a transmitter. The NH3 sensor, proven in commercial vehicles, is a heated gas sensor with an Al2O3 substrate. A separate sensor control unit (SCU) controls the heating element. The ammonia content is transferred to the transmitter as a CAN bus message via a cable with a maximum length of 15 m (50 ft). This outputs the ammonia content as an analog signal 4...20 mA, which can be processed by any PLC control. This significantly simplifies the monitoring of SCR catalytic converters. These generally use a nitrogen oxide sensor with zirconium oxide ceramics and are cross-sensitive to ammonia in the 0…300 ppm range. It is impossible to differentiate between ammonia and nitrogen oxide at these concentrations. The user must find out by testing whether there is an overdose or underdose of DEF. With the "NH3 monitor" there is no doubt. A more precise dosing strategy is possible. The ammonia sensor is designed to last more than 5,000 hours and can be easily replaced. First pilot plants in Austria and California have successfully started operation. Target applications are exhaust gas cleaning using SCR from biogas plants, combined heat and power plants (CHP), GenSets, off-road and

ship drives as well as the cleaning of industrial flue gases. The system is precise in the 0…100 ppm NH3 range, but can detect much higher concentrations. Available are versions with 12 V and 24 V DC power supplies. The transmitter is clipsed to a top-hat rail (DIN mounting).

NH3 Monitor with PLC

Part-No. No. 70582e
NH3 sensor, 24 V, heavy duty version 0-100 ppm NH3. Requires a Sensor Control Unit (SCU) for heater control and signal generation.

Part-No. No. 40103e
Welding sleeve with M 18x1.5 thread for screwing in NH3 and O2 sensors

40103 M18x1-5

Part-No. No. 40011e
Closing cap for closing the welding sleeve 40103 if no sensor is installed.

NH 3 Sensor

Part-No. No. 70583e
Sensor Control Unit (SCU). This controls the heating element of the NH3 sensor and outputs a digital CAN bus signal. Operating voltage 24V.

Part-No. No. 70595e
Connection cable for SCU ready-made with 5 m cable and 4-pin TE connectivity plug

70595 Cable NH3
NH3 SCU 4-pins

Part-No. No. 70591e
NH3 transmitter converts the digital CAN bus signal of the SCU into a 4...20 mA signal, which can be read and processed analogously by any PLC. 24V DC power supply required. Mounting on DIN rail.

NH3 Transmitter 70591