APHA-370 (THC, NMHC, CH4)

Overview

The APHA-370 continuously monitors atmospheric THC, NMHC, and CH4 concentrations using a cross-flow modulated selective combustion type method combined with a hydrogen ion detection method. The APHA-370 employs an independent, internal dry-method sampling device to achieve the highest levels of sensitivity and accuracy.

Features

The APHA-370 uses a combination of the flame ionization detection method and selective-combustion.
This gives it the advantage of the single-detector method plus the ability to perform continuous measurements, free of zero-drift, for THC, NMHC, and CH4. The design gives great stability and high sensitivity (0-5 ppm F.S.)

The APHA-370 has a relative-sensitivity correction function for CH4 and NMHC.

All the necessary features are built right into a single rack-sized instrument, including a catalytic unit for selective combustion (i.e., an NMHC cutter); a cataytic unit for generating reference gas and auxiliary combustion air (standard); and a sampling pump. The only supplemental gas required is H2.

Specifications

Principle

Flame ionization detection (FID) with selective combustion

Application

THC, NMHC, and CH4 in ambient air

Range

Standard ranges: 0-5/10/20/50 ppmC; auto range ~ manual range selectable; can be operated by remote switching.
Optional (measurable) ranges: 4 ranges selectable from 0-100 ppmC, within 10 times range ratio;
auto range ~ manual range selectable; can be operated by remote switching.

Repeatability

±1.0% of F.S.

Linearity

±1.0% of F.S.

Sample gas flow rate

Approx. 0.9 L/min

Indication

Measured value, range, alarm, maintenance screen

Alarms

During AIC, zero calibration error, span calibration error, temperature error in zero gas purifier, ignition failure error, etc.

On-screen messages are available in four languages

English, German, French, and Japanese.

Input/output

• 0-1 V/0-10 V/4-20 mA, to be specified (2 systems: either (1) momentary value and integrated or (2) moving average value) 
• Contact input/output 
• RS-232C

Power

100/110/115/120/220/230/240 VAC, 50/60 Hz (to be specified)

Dimensions

430(W) x 550(D) x 221(H) mm

Mass

Approx. 33 kg,

Notes

ppmC is shown as symbol, not as unit.