RKI Instruments GX-86A Bedienungsanleitung

INSTRUCTION MANUAL

MODEL GX-86A

PORTABLE FOUR GAS DETECTOR

RKI Instruments, Inc.

33248 Central Ave, Union City, CA 94587 • Tel: 510-441-5656

Model GX-86A Instruction Manual

RKI Instruments, Inc. Page 1

INTRODUCTION

The RKI Model GX-86A is an advanced gas detection instrument,

incorporating proven detection hardware and microprocessor controls.

The GX-86A is compact, convenient, and offers a full range of

features, including:

•Simultaneous detection of combustible gas, oxygen deﬁciency,

carbon monoxide, and hydrogen sulﬁde. (Other toxic gases

optional.)

• Dot-matrix liquid crystal display (LCD) for complete, understand-

able information at a glance

• Distinctive audible alarms for dangerous conditions and malfunc-

tions

•Intrinsic safety for Class I, Division I, Groups A, B, C, and D haz-

ardous atmospheres

•Microprocessor control for reliability, ease of use, and advanced

capabilities, including data logging and user-adjustable alarms

•Convenient size, with the full range of well-known GX-86 acces-

sories

WARNING

THE GX-86A IS DESIGNED TO DETECT COMBUSTIBLE

GAS, OXYGEN DEFICIENCY, HYDROGEN SULFIDE, AND

CARBON MONOXIDE, WHICH CAN BE LETHAL. USERS

MUST FOLLOW THE INSTRUCTIONS AND WARNINGS IN

THIS MANUAL TO ASSURE PROPER AND SAFE OPERATION

OF THE INSTRUMENT.

Model GX-86A Instruction Manual

Page 2 Hayward, California (510) 441-5656

DESCRIPTION

The RKI Model GX-86A detects combustible gas (LEL), oxygen

deﬁciency (O2), carbon monoxide (CO), and hydrogen sulﬁde (H2S).

See Table 1 for standard detection ranges for these gases. Gas

detection features include distinctive alarms for dangerous gas

concentrations, time-weighted averaging and short term exposure

limit for toxic gases, and logging of detection data.

The GX-86A has a rugged plastic housing, touch-pad control panel,

and a back-lit dot matrix LCD. The included carrying case protects the

instrument and allows hands-free operation for the user. See Figure 1.

The GX-86A is easy to adjust and maintain, with user-replaceable

batteries and sensors. The microprocessor control enables the user to

display a comprehensive listing of gas levels detected and other

related data.

Table 1: Standard Detection Ranges

Gas Detected Range

Combustible 0 - 100% LEL (lower

explosive limit)

O20 - 40%

H2S 0 - 100 ppm (parts per mil-

lion)

CO 0 - 300 ppm

Model GX-86A Instruction Manual

RKI Instruments, Inc. Page 3

Control Panel

Battery Cover

Remote Alarm/

Charger Jack

Jack

Sensor

Cover

Internal

Buzzer Interface

Port

Figure 1. GX-86A Components

Earphone

Model GX-86A Instruction Manual

Page 4 Hayward, California (510) 441-5656

COMPONENTS AND CONTROLS

Case

The GX-86A has a durable plastic case. The sensors are housed in a

detachable block at the bottom of the instrument.

Control Panel

The control panel contains the display, alarm lights, and switches that

control the many functions of the GX-86A. The switches are touch-

pads, to reduce the possibility of accidental activation or damage. See

Figure 2.

Switches

1. ON/OFF/ENTER

The ON/OFF/ENTER switch controls power to the instrument.

(Bias power for the electrochemical sensors is not affected by the

power switch.) It also selects input modes to access user-

changeable features.

OFF - HOLD 5 SEC

PPM

% LEL % PPM

AIR ▼

(SHIFT)

▲DISPLAY

/(ADJ.) ON/OFF

/ENTER

Figure 2. Contr

ol Panel

Model GX-86A Instruction Manual

RKI Instruments, Inc. Page 5

2. AIR/▲

TheAIR/▲switch activates the GX-86A’s Demand Zero function,

which automatically adjusts the instrument in fresh-air conditions.

It is also used to scroll through the display and settings modes.

3. (SHIFT)/▼

The (SHIFT)/▼switch scrolls through the display and settings

modes, and enters instructions into the GX-86A’s microprocessor.

4. DISPLAY/(ADJ)

The DISPLAY/(ADJ) switch activates the display modes, and

enters instructions into the GX-86A’s microprocessor.

5. Alarm LEDs

Four red light-emitting diodes (LEDs) provide visual alarms for

gas concentrations and malfunctions.

Battery Compartment

The GX-86A uses two “C” size cells; alkaline batteries will run the

GX-86A for approximately 10 hours, rechargeable nickel-cadmium

batteries will run for approximately 7 hours. (Rechargeable batteries

can be recharged in the GX-86A with the optional battery charger.)

The GX-86A battery compartment is located on the back of the

instrument. The battery cover has a strap to prevent accidental

opening.

Interface Port

The GX-86A’s built-in data logger records gas concentrations at

programmed intervals. These measurements can be downloaded

through the interface port to a PC-compatible computer for use in data

Model GX-86A Instruction Manual

Page 6 Hayward, California (510) 441-5656

analysis programs.

Buzzers and Earphone

An electronic buzzer is mounted at the back of the case, behind a felt

screen. The buzzer sounds for gas alarms and system malfunctions.

A 2.5 mm phone jack at the bottom left rear corner of the case

connects to an earphone, for use in high noise environments. An

identical jack on the bottom right rear corner connects to an external

buzzer or the optional battery charger.

Carrying Case

The carrying case has openings for the diffusion grill, buzzer, remote

alarm/charger jack, earphone jack, control panel, and Data Logger

interface port. The carrying case includes a belt loop and shoulder

straps.

Sensors

The sensors are mounted at the rear of the instrument, in a removable

block. A slotted metal cover protects the sensors, but allows

Model GX-86A Instruction Manual

RKI Instruments, Inc. Page 7

atmosphere to diffuse inward. See Figure 3.

Combustible Gas Sensor

The LEL sensor detects combustible gas and vapors in the atmosphere

with a catalytic platinum element. The reaction of gas with oxygen on

the catalyst causes a change in the resistance of the element, which is

converted by the GX-86A into a reading of gas concentration.

The LEL sensor responds to a wide range of gases; see Appendix A

for the Relative Response Chart.

Oxygen Sensor

The O2sensor is an electrochemical cell, which reacts to the oxygen

in the atmosphere, producing a current proportional to the oxygen

concentration. This current is converted by the GX-86A into an

oxygen reading.

CO, and H2S (Toxics) Sensors

The toxics sensors are electrochemical cells, which react to gas in the

CO Sensor

O2Sensor

H2S Sensor

LEL Sensor

Sensor Cover

Spring Clips (2)

Figure 3. Sensors

Model GX-86A Instruction Manual

Page 8 Hayward, California (510) 441-5656

atmosphere, producing a current proportional to the concentration of

gas. The current is converted by the GX-86A into a measurement of

gas concentration. The CO sensor uses a charcoal ﬁlter disk that

covers its opening, to eliminate interference from H2S.

To maintain sensitivity and stability, these sensors are kept on a

continuous bias current, even when the instrument power is off.

Batteries with an adequate charge must be installed to provide the bias

current.

Model GX-86A Instruction Manual

RKI Instruments, Inc. Page 9

OPERATION

Preparation

Normally the GX-86A requires little preparation before use. To install

the GX-86 Extender Cable, see the ACCESSORIES section.

Standard Start-up

1. Press the ON/OFF/ENTER switch once.

a.This message shows only when the “Lunchbreak” feature is

activated (See USER OPTIONS). Press the AIR/▲switch to

continue Short Term Exposure Limit (STL) and Time-Weighted

Average readings from the last use of the GX-86A. Press DISP/

(ADJ.) to start new STL and TWA readings

Lunchbreak can accumulate up to 100 hours of STL/TWA read-

ings. If the 100-hour limit is exceeded, this prompt appears:

Press AIR/▲to clear the memory and start accumulation of

readings.

b.The start-up battery check shows the minimum usable and

actual battery voltage (for example, 3.0V for fresh batteries).

STL TWA RESUME

YES:AIR NO:DISP

CANT RESUME

PUSH AIR: CLEAR

BATTERY MIN. 2.3V

BATTERY NOW 3.0V

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