Industry

APSA-370 Ambient Sulfur Dioxide Monitor

Overview

The APSA-370 is a device for the continuous monitoring of atmospheric SO₂using UV fluorescence. The APSA-370 employs an proprietary, internal dry-method sampling device to achieve the highest levels of sensitivity and accuracy. The dry-method, due to its minimal maintenance requirements capability of continuous monitoring and instantaneous analysis of gas in its unaltered state, has been a preferred method for monitoring the atmospheric pollution.

AP-370 Series product literature

Features

The APSA-370 uses an innovative detector and a new optical system for low background, high sensitivity (0.05 ppm F.S.), and greatly improved stability.
The fluorescent chamber design gives measurements with minimum influence from moisture.
The unit has built-in aromatic hydrocarbon cutter with a selective transmission membrane. This reduces the influence of interference components. Coupled with HORIBA's unique flow-path, it also makes it possible to extend the working life of the cutter and to take measurements effects of sample flow variations.
In comparison with the FPD method, the APSA-370 design is (1) highly selective for SO₂, (2) requires no supplemental gas, and (3) gives linear output.
Compensation for the lamp's luminous energy decline guarantees prolonged calibration stability.
The sample inlet has a built-in Teflon filter.

Manufactured by HORIBA

Specifications

Principle	UV fluorescence (UVF)
Application	SO₂ in ambient air
Range	Standard ranges: 0-0.05/0.1/0.2/0.5 ppm; auto range ~ manual range selectable; can be operated by remote switching. Optional (measurable) ranges: 4 ranges selectable from 0-10 ppm, 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. 0.7L/min
Indication	Measured value, range, alarm, maintenance screen
Alarms	During AIC, zero calibration error, span calibration error, temperature error in catalyzer, 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. 19 kg.