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GasWatch Instruction Manual (Two-Gas) Introduction • 1

Introduction

The GasWatch is a portable gas monitoring device. It is offered in single-gas and two-gas

versions. This instruction manual describes the two-gas version. The GasWatch is

compact, convenient, and offers a full range of features, including:

• detection of oxygen deﬁciency

and

carbon monoxide

hydrogen sulﬁde

• LCD display for complete, understandable information at a glance

• distinctive audible alarms for dangerous gas conditions and malfunctions

• designed for intrinsic safety for Class I, Groups A, B, C, and D hazardous atmospheres

• microprocessor control for reliability, ease of use, and advanced capabilities

• small size and light weight for user comfort

• wrist strap or

optional

arm strap for hands-free gas monitoring

WARNING: The GasWatch is designed to detect oxygen deﬁciency

and

carbon monoxide

hydrogen sulﬁde, which can be life threatening. Users must follow the

instructions and warnings in this manual to assure proper and safe

operation of the GasWatch.

Speciﬁcations

Table 1: Speciﬁcations

CX-GW HX-GW

Target Gases Carbon monoxide (CO); Oxygen (O2) Hydrogen sulﬁde (H2S); Oxygen (O2)

Detection Range

CO:

0 to 500 ppm;

O2:

0 to 40.0% vol.

H2S:

0 to 150.0 ppm;

O2:

0 to 40.0% vol.

Alarm Point

CO:

25 ppm;

O2:

19.5% vol. (dec.);23.5% vol. (inc.)

H2S:

10 ppm;

O2:

19.5% vol. (dec.);23.5% vol. (inc.)

Display Increment

CO:

1 ppm;

O2:

0.1% vol.

H2S:

0.5 ppm;

O2:

0.1% vol.

Sampling Method Diffusion Diffusion

Response Time

CO:

T90 in 30 sec.;

O2:

T90 in 20 sec.

H2S:

T90 in 30 sec.;

O2:

T90 in 20 sec.

Accuracy

CO:

5 ppm (up to 150 ppm);

O2:

0.5% vol.

H2S:

1.5 ppm (up to 30 ppm);

O2:

0.5% vol.

Dimensions 3.1 in. x 3.3 in. x 1.2 in. (7.9 cm x 8.4 cm x 3.0 cm)

Weight 6 ounces (170.1 grams)

Battery life

720 hours

Oper. Temperature 14

F to 104

F (-10

C to 40

Humidity (max.) 85% RH (non-condensing)

(based on continuous operation without alarms or use of back light feature)

1 2 3 4 5 6 7 8 9 10 ... 17 18

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