Analogue Evaluation Board for p-Type Metal Oxide Sensors - Metal Oxide Transmitter

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• Gas/ vapours detected: H2S, VOCs and CO
• Sensor type: Alphasense p-type metal oxide gas sensor
• Power input: 5-6 VDC
• Voltage output: 0 to 4.75 VDC
• Usage/storage range: -30 to +50 °C (-22 to +122 °F)
• Usage humidity: 0% to 95% (non-condensing)

Model Number: Metal Oxide Transmitter
Data Sheet:

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Product Specification

Analogue Evaluation Board for p-Type Metal Oxide Sensors

Introduction and specification
This Evaluation Board measures the sensor signal and controls the heater for a p-type metal oxide gas sensor. This Evaluation Board includes:
• Buffered voltage outputs for heater voltage and sensor resistance measurement
• Integrated two-temperature heater pulsing for optimum sensor performance
• Selectable sensor resistance ranges for low and high gas concentrations

Please read these instructions to ensure correct installation and use of your p-type metal oxide gas sensor.

P-type Metal Oxide Transmitter Specification

Gas/ vapours detected	H2S, VOCs and CO
Sensor type	Alphasense p-type metal oxide gas sensor
Performance	See H2S, VOC and CO web technical datasheets
Warm-up time	10 minutes to full specification; 30 seconds to reading
Power input	5-6 VDC Transient current: 700 mA (~10s) Operating current: 200 mA
Voltage output	0 to 4.75 VDC
Connector	6-pin Molex plug Pin 1 (power) Pin 2 (supply ground) Pin 3 (sensor signal) Pin 4 (signal ground) Pin 5 (heater power) Pin 6 (heater ground)
Sensor power select (sensor resistance range)	Selectable (LK2) low range (up to 1MΩ) high range (up to 3MΩ)
Heater two-temp control	User selectable (LK3)
Two-temperature pulsing period	User selectable (LK1) 5 minute measurement cycle, 60 second clean cycle 10 minute measurement cycle, 60 second clean cycle
Heater adjustment	10-turn potentiometer to set heater resistance (VR1)
Usage/storage range	-30 to +50 °C (-22 to +122 °F)
Usage humidity	0% to 95% (non-condensing)

Replacement/ additional parts ordering for P-type Metal Oxide transmitter
Replacement and spare parts can be ordered by quoting the part numbers below.

Part Number	Description
034-0025-00	M6 Nylon washer
010-0178-02	ISB Transmitter Lead
029-0059-00	Foam Seal 'A' Series 4-20mA Gas Hood (For use with TO5 Gas Hood)
029-0068-00	Foam Seal (For use with ATEX & 6 Pin Plastic Gas Hood)
033-0012-00	M3 x 20mm long Pillar (Individual part number).
000-GSHD-08	MOX Evaluation Gas Hood Assembly for MOX ATEX
000-GSHD-09	MOX Evaluation Gas Hood Assembly for MOX 6 Pin Plastic
000-GSHD-10	MOX Evaluation Gas Hood Assembly for MOX TO5
HS2, VOC and CO (all packages)	Replacement sensor. Heater recalibration will be required.