RKI Instruments GX-94 User manual

RKI Instruments, Inc.

1855 Whipple Road

Hayward, CA 94544

800-754-5165

GX-94

Operator’s Manual

Part Number: 71-0008RK

Edition: Revision P2

Released: 6/10/2002

Page 1

•

Warranty GX-94 Operator’s Manual

WARRANTY

RKI Instruments, Inc., warrants the GX-94 sold by us to be free from defects in

materials, workmanship, and performance for a period of one year from the date

of shipment from RKI Instruments, Inc. Any parts found defective that warranty

period will be repaired or replaced, at our option, free of charge.This warranty

does not apply to those items which by their nature are subject to deterioration or

consumption in normal service, and which must be cleaned, repaired, or replaced

on a routine basis.Examples of such items are:

Warranty is voided by abuse including mechanical damage, alteration, rough han-

dling, or repair procedures not in accordance with the instruction manual.This

warranty indicates the full extent of our liability, and we are not responsible for

removal or replacement costs, local repair costs, transportation costs, or contin-

gent expenses incurred without our prior approval.

This warranty is expressly in lieu of any and all other warranties and representa-

tions, expressed or implied, and all other obligations or liabilities on the part of RKI

Instruments, Inc., including but not limited to the warranty of merchantability or ﬁt-

ness for a particular purpose. In no event shall RKI Instruments, Inc., be liable for

indirect, incidental, or consequential loss or damage of any kind connected with

the use of its products or failure of its products to function or operate properly.

This warranty covers instruments and parts sold to users only by authorized dis-

tributors, dealers, and representatives as appointed by RKI Instruments, Inc.

We do not assume indemniﬁcation for any accident or damage caused by the

operation of this gas monitor and our warranty is limited to replacement of parts or

our complete goods.

Absorbent cartridges

Filter elements, disks, or sheets

Pump diaphragms and valves

Batteries

Page 2

•

Table of Contents GX-94 Operator’s Manual

TABLE OF CONTENTS

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Battery Compartment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Interface Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Belt Clip and Strap Flanges . . . . . . . . . . . . . . . . . . . . . . . . 10

Diffusion Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Circuit Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Starting Up the GX-94 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Turning Off the GX-94 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

ALARMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Resetting Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

DISPLAY MODE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

User and Station ID Screen . . . . . . . . . . . . . . . . . . . . . . . . 21

Peak Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Average Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Elapsed Time Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

STEL Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

TWA Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Battery Voltage Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Time/Date/Temperature Screen. . . . . . . . . . . . . . . . . . . . . 25

Clear Data Logger Screens . . . . . . . . . . . . . . . . . . . . . . . . 26

Remaining Log Time Screen . . . . . . . . . . . . . . . . . . . . . . . 26

GX-94 Operator’s Manual Table of Contents

•

Page 3

SETUP MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Tips for Using Setup Mode. . . . . . . . . . . . . . . . . . . . . . . . . 27

Entering Setup Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Resetting the NVRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Updating the Gas Combination . . . . . . . . . . . . . . . . . . . . . 29

Viewing and Setting Alarms . . . . . . . . . . . . . . . . . . . . . . . . 29

Setting the Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . 30

Setting the Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Setting the Logging Frequency . . . . . . . . . . . . . . . . . . . . . 31

Setting the Alarm Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Setting the Lunch Break Function . . . . . . . . . . . . . . . . . . . 31

Setting the ID Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Setting the Calibration Reminder . . . . . . . . . . . . . . . . . . . . 31

Setting the Data Logging Alarm . . . . . . . . . . . . . . . . . . . . . 32

Setting the Buzzer Frequency . . . . . . . . . . . . . . . . . . . . . . 32

Displaying Circuit Voltages. . . . . . . . . . . . . . . . . . . . . . . . . 32

Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . 32

CALIBRATION MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Calibration Supplies and Equipment . . . . . . . . . . . . . . . . . 33

Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Calibrating the GX-94. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Setting the Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . 39

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Main Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Lithium Memory Backup Battery . . . . . . . . . . . . . . . . . . . . 42

Charcoal Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Sensor Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Sample-Drawing Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

GX-94 Operator’s Manual Page 4

INTRODUCTION

The RKI Model GX-94 is an advanced gas detection instrument in use

internationally for personal protection in a variety of industries.The GX-

94 is rugged, compact, convenient, and offers a full range of features,

including:

• Simultaneous detection of two, three, or four gases.The standard

conﬁguration is combustible gas in the %LEL range (HC,) oxygen

deﬁciency (O

), carbon monoxide (CO), and hydrogen sulﬁde (H

S).

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

information at a glance.

• Visual and audible alarms for alarm conditions and malfunctions.

• Underwriters Laboratories Classiﬁcation for intrinsic safety for Class

I, Division I, Groups A, B, C, and D hazardous atmospheres.

• Microprocessor control for all functions, including data logging and

user adjustable alarms.

• Compact size.

• Belt clip and shoulder strap standard.

WARNING

GX-94

DESIGNED

DETECT

COMBUSTIBLE

GAS

OXYGEN

DEFICIENCY

HYDROGEN

SULFIDE

AND

CARBON

MONOXIDE

WHICH

CAN

LETHAL

. U

SERS

MUST

THE

INSTRUCTIONS

AND

WARNINGS

THIS

MANUAL

ASSURE

PROPER

AND

SAFE

OPERATION

THE

INSTRUMENT

Page 5 GX-94 Operator’s Manual

SPECIFICATIONS

Table1 lists physical and environmental speciﬁcations for the GX-94.

Table 2 lists speciﬁcations for the GX-94’s sensors and channels.

Table 1: GX-94 Speciﬁcations

Target Gases Combustible Gas (HC); Oxygen (O

), Carbon Monox-

ide (CO), Hydrogen Sulﬁde (H

Case RFI Shielded High Impact ABS Plastic

Safety/Regulatory UL Classiﬁed Instrinsically Safe for Class I, Division I,

Groups A, B, C, & D

Dimensions 3.54” x 2.52” x 6.3” (90 x 64 x 160 mm)

Weight 25 ounces (700 g)

Power Two C size alkaline batteries (optional Ni-Cd batteries

externally charged)

Continuous Operat-

ing Hours (non-alarm

operation)

Alkaline: 12 hours

Ni-Cd: 8 hours

Operating Tempera-

ture & Humidity 14°F to 104°F (-10°C to 40°C)

0 to 95% RH, non-condensing

GX-94 Operator’s Manual Page 6

1 Alarms are user adjustable.See

Viewing and Setting Alarms

in the setup mode section.

Table 2: Sensor/Channel Speciﬁcations

Combustible Gas

(HC) Oxygen Hydrogen

Sulﬁde Carbon

Monoxide

Detection

Range 0 - 100% LEL 0 - 40.0% 0 - 100.0 ppm 0 - 500 ppm

Display

Increments 1% LEL 0.1% 0.5 ppm 1 ppm

Low Alarm

10% LEL 19.5%

(decreasing) 10.0 ppm 25 ppm

High Alarm

50% LEL 23.5%

(increasing) ---- ----

TWA Alarm

---- ---- 10.0 ppm 25 ppm

STEL

Alarm

---- ---- 15.0 ppm 400 ppm

Detection

Principle Catalytic

Combustion Electrochem-

ical (gal-

vanic type)

Cell

Electrochemi-

cal Cell Electrochem-

ical Cell

Ceiling

Alarm --- ---- Off Off

Accuracy

0 - 20% LEL

± 2% LEL

21% - 100% LEL

± 5% LEL

± 0.5% Oxy-

gen 0 - 30 ppm

±1.5 ppm

31 - 100 ppm

±5 ppm

0 - 50 ppm

±5 ppm

51 - 150 ppm

± 15 ppm

151 - 500

ppm

± 25 ppm

Page 7 GX-94 Operator’s Manual

DESCRIPTION

Case

The GX-94 has a high impact, RF shielded ABS plastic case with a rub-

ber guard that also functions as a water-resistant seal between the two

halves of the case.The case has sturdy plastic ﬂanges on the left and

right sides for installation of the shoulder strap.It has an opening on the

top front of the GX-94 for the buzzer sound and it has sensor ports

which allow diffusion through the sensor screen on the top rear of the

GX-94.

Control Panel

Figure 1: GX-94 Control Panel

The control panel is at the front of the GX-94 for easy access when the

Control Button, 4X

INPUT

(Shift)

(ADJ.)

AIR Display

ON/OFF

Alarm

Display

Model GX-94

Light Sensor

AlarmLED

GX-94 Operator’s Manual Page 8

GX-94 is carried or clipped on a belt. It contains the display, the touch-

pad buttons that control the many functions of the GX-94, the Alarm

LED, and the light sensor.The display is to the left of the buttons and

simultaneously shows the gas readings for all active channels.The

touch-pad buttons are low proﬁle to reduce the risk of accidental activa-

tion and damage.The functions of the control panel buttons are

described below in Table 3.

Alarm LED

A red light-emitting diode (LED) is visible through a lens located on the

upper right front of the control panel above the buttons.It provides a

visual indication for alarms and malfunctions.

Light Sensor

A light sensor is located to the left of the alarm LED.It monitors the level

of ambient light.When the ambient light level becomes too low to allow

Table 3: GX-94 Button Functions

Button Function(s)

ON/OFF/INPUT • turns the GX-94 on and off

• used during setup and calibration to enter values

DISPLAY/(ADJ.) • activates display modes

• enters instructions into the GX-94’s microprocessor

AIR/▲• activates the demand zero function (automatically

adjusts the GX-94 in fresh air conditions)

• scrolls through the various instrument modes

• adjusts parameters in the various instrument modes

• enters instructions into the GX-94’s microprocessor

SHIFT/▼• scrolls through the various instrument modes

• adjusts parameters in the various instrument modes

• enters instructions into the GX-94’s microprocessor

• resets alarms if GX-94 is programmed for latching

alarms

Page 9 GX-94 Operator’s Manual

easy viewing of the display, the light sensor prompts the display back-

light to turn on.

Note

The backlight does not operate in Setup Mode.

Figure 2:Top & Side views of the GX-94

Battery Compartment

The battery compartment is located on the top of the GX-94.A tethered

battery cover allows easy battery replacement.It is tethered to the inter-

face port cover.

Top Case

Bottom Case

Belt Clip

Battery Cover

Screw

Battery Cover

Buzzer

Opening

Shoulder Strap

Flange, 2X

Interface

Port Cover

Sensor Screen

Threaded Hole for

Sample Adapter

Table of contents

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