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CH4

NP-237H

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NP-237H

NP-237H is designed for the measurement of hydrocarbon gas/vapors of crude oil gas in inert gas or air at vessels.

The NP-237H actually combines two detection methods in a single device: a portable hydrocarbon gas indicator, using the catalytic detection principle to respond to flammable gases up to the lower explosive limit (0-10% LEL / 0-100% LEL), and a thermal conductivity indicator, using the cooling effect of hydrocarbon gas to produce reading up to 100% vol (0-20% vol / 0-100% vol).

Both detection methods employ the wheatstone bridge measurement principle and use the same batteries, meters and sampling system. An extensive range of standard accessories rounds up model NP-237H.

Features:

Portable hydrocarbon gas detector
Suited for detection of HC gas/vapours in an inert gas
4 measuring ranges (%LEL and %vol)
Catalytic combustion and thermal conductivity
MED approved (Wheelmark)

NP-237H

Model	NP-237H
Measurable gases	Hydrocarbons (HC)	Methane (CH 4)	LPG
Detection method	%LEL range: Catalytic combustion (HC in air) % Vol range: Thermal conductivity (HC in air or inert gas)
Measuring range	0-10% LEL / 0-100% LEL 0-20% vol / 0-100% vol
Accuracy	Better than ± 20% FS in range of 0-10% LEL Better than± 5% FS in range of 0-100% LEL Better than ± 5% FS in range of 0-20% vol Better than ± 20% against reading in range of 0-100% vol (at constant temperature)
Response time	Better than 20 sec to get 90%
Operating temperature range	-10°C - +40°C
Power source	Dry batteries x 4 pcs
Continuous operation	7 hours minimum
Approvals	Instrinsically safe (id2G3), NK and HK (marine design only) in Japan, MED approved (Wheelmark)
Dimensions and weight	160 (W) x 90 (H) x 150 (D) mm, approx. 2.7 kg (Instrument only)
Standard accessoires	Dry batteries, gas sampling probe, gas sampling hose (1m), junction tube, carrying case with shoulder strap, filter tube with flow monitor, cotton wool

Specifications subject to change without notice.