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Operation of MOS Sensors

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 VDC 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 voltage divider. This requires two voltage supplies: heater voltage (V
H ) and circuit voltage (V
C ). V
H is applied to the heater in order to maintain a constant, elevated temperature, for optimum sensing. V
C is applied to allow a measurement of the output voltage (V
out ) across a load resistor (R
L ). Sensor Pin Out
V C Top view of sensor
V H Pin 2 Pin 3
Sensor V OUT GND R L Pin 1 Pin 4 Pins 1 and 3 on the TO-39 header are attached to theheater. Apply V Tab
H across these pins. Pins 2 and 4 on the TO-39 header are attached to theresistive sensor element. Connect these pins in themeasuring circuit.

Synkera Technologies strives tobe customer oriented. If you have a special application you w ould like to discuss, o r

Sensor Resistance Calculation

questions you would like answered please contact us atinfo@synkera.com

Sensor Resistance (Rs) is calculated using the followingformula:

.

R*VVVR

LoutoutCs SYNKERA TECHNOLOGIES, INC.
2021 Miller Dr., Ste B, Longmont, CO 80501 www.synkera.com info@synkera.com tel 720-494-8401 fax 720-494-8402 2/20/2007