M70 moisture monitor with auto-zero</span>

The Model M70 is designed to monitor moisture/water content in natural gas applications. A heated conductive polymer sensor that provides a linear output of moisture concentration is incorporated into the design of the instrument. The M70 also offers an integrated sample conditioning system and Auto-Zero function that zeros the sensor on a daily or other configurable schedule.

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Features

Range: 0–20lbs/mmscf (custom ranges available)
Rugged mechanical design
Affordable measurement
Unit will display in lbs/mmscf and/or ppm
2% of reading or 10 ppm (0.5 lb per million) accuracy
4–20 mA output and alarms (2-wire)
RS-232 and RS-485 Serial Communications
Ultra-low power: Less than 2 watts power consumption
Dual-line, 16-character display
Daily Auto-Zero

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Certification

Intertek Certification

Value

The unit has a 4-20 ma output and RS-232/485 serial communications, alarms, internal menu scroll buttons. The M70 can display up to 128 different parameters including lbs/mmscf, ppm, sensor temperature, raw millivolts and calibration factor and sensor heater load. The sensor is mounted in an insulated flame proof enclosure with flame arrestors installed in the sample flow path. Many natural gas tariff limits are set a 4 lbs water per million standard cubic feet. This is closely equivalent to 80 ppm or 64 mg/m3. The sensor is controlled to 50°C and operated at atmospheric pressure to maximize resistance to process variables and adsorption of stream contaminants.

Foul resistant. The M70 offers industry leading value in price while still maintaining reliability. The rugged sensor is resistant to chemical fouling such as amines and glycols and methanol and can be washed with alcohol without permanent damage.

Minimal Power Removable Sensor. The sensor can be readily removed for cleaning or replacement with standard tools in seconds. The linear output enables the user to perform a single-point calibration. The standard M70 uses less than 2 watts power when installed in areas where ambient temperature is more than 0°C. This means it can be used at sites where only solar or other minimal power is available.

Specifications

Power	12–24 VDC @ less than 2 watts
Electrical classification	Certified for Class I, Div 1, Groups C & D
Ambient	0 to 60°C, 32 to 140°F (standard) Consult factory for other requirements
Output Ranges	0–20 lbs/mmscf standard 10–300 ppm (optional) (0.5 to 300 lbs/mmscf)
Response Time	20 seconds to 90% of step change wetting 300 seconds to 90% dry down
Accuracy	2% of reading or 10 ppm (0.5 lbs/million), whichever is greater
Outputs	4–20 mA Serial R2 232 and 485 Dual 3 amp solid state alarm relays Modbus
Displays	Dual-line, 16-character display Moisture in ppm or lbs/million, sensor temperature °C, heater duty, calibration factor, and raw millivolts can be scrolled from internal button
Auto Zero	Includes ASCO solenoid and extra flow meter. Inlet sample is dried daily (configurable) for 15 minutes in a Silica Gel Moisture trap at 80 psig to provide a daily repeatable moisture concentration reference, typically .5 lbs/mmscf.