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Synkera Technologies, Inc. Operation of Synkera MOS Sensors 2021 Miller Dr., Suite B Longmont, CO 80501 Circuitry A transducer is available from Synkera to operate the sensor. This circuit, packaged on a 2”x 1.5” printed circuit board, is powered with 9 – 24 VDC. The transducer provides a 0 – 5 V DC output which can be adjusted for sensor offset and gain. The heater voltage is also adjustable. The circuit is set to the recommended values at the factory.

Basic Measuring Circuit

The sensor can be operated using a simple voltagedivider. This requires two voltage supplies: heatervoltage (V
H ) and circuit voltage (V
C ). V
H is applied tothe heater in order to maintain a constant, elevated temperature, for optimum sensing. V
C is applied toallow a measurement of the output voltage (V

Sensor Pin Out

out )across a load resistor (R Top view of sensor
L ).
V C Pin 2 Pin 3
V H Sensor V OUT Pin 1 Pin 4
GND R L Tab

LEL Hydrogen (H2) P/N 703 - 54300 Pins 1 and 3 on the TO-39 header are attached to the heater. Apply V

H

across these pins. Pins 2 and 4 on the TO-39 header are attached to the resistive sensor element. Connect these pins in the measuring circuit.

Synkera Technologies strivesto be customer oriented. I f you have a special application you would like to discuss, or questions youwould like answered pleasecontact us at sensors@synkera.com .

Sensor Resistance Calculation

Sensor Resistance (Rs) is calculated using the following formula:

R*VVVR

LoutoutCs 720-494-8401 e-mail: info@synkera.com www.synkera.com 720-494-8402 (fax)
For information on warranty, please refer to Synkera Technologies, Inc. Standard Terms and Conditions. Information on this data sheet represents typical values from a number of Synkera sensors. Actual values from sensor to sensor can vary slightly.