Bacharach 23-9613 Instruction Manual

hIstruction 23-9613

Rev. No. 2

January, 1990

:

-..._

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INSTRUCTION MANUAL

. . .

.

”

Tl!! SNIFFER”

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WARNING!

Because this instrument is used to detect and monitor materials and conditions which are listed by
OSHA or others as potentially hazardous to personnel and property, the information in this manual
must be fully understood and utilized to ensure that the instrument is operating properly and is both
used and maintained in the proper manner by qualified personnel. An instrument that is not properly
calibrated, operated and maintained by qualifiedpersonnel is likely to provide erroneous information,
which could prevent

user

awareness

of a potentially hazardous situation for the instrument user, other

personnel and property.

If, after reading the information in this manual, the user has questions regarding the operation,
application or maintenance of the instrument, supervisory or training assistance should be obtained
before use. Factory assistance is available by tailing (4 12) 963-2000.

Bacharach, Inc.

625

Alpha Drive, Pittsburgh, PA 15238 [phone]

Printed in U.S.A.

@Registered Trademarks

Bacharach, Inc., warrants to Buyer that at the time of delivery this
Product will be free from defects in material and manufacture and
will conform substantially to Bacharach Inc.'s applicable

specifications. Bacharach's liability and Buyer's remedy under this

warranty are limited to the repair or replacement, at Bacharach's

option, of this Product or parts thereof returned to Seller at the
factory of manufacture and shown to Bacharach Inc.'s reasonable
satisfaction to have been defective; provided that written notice of
the defect shall have been given by Buyer to Bacharach Inc. within
one (1) year after the date of delivery of this Product by Bacharach,
Inc.

Bacharach, Inc. warrants to Buyer that it will convey good title to

this Product.

Bacharach's liability and Buyer's remedy under this

warranty of title are limited to the removal of any title defects or,

at the election of Bacharach, to the replacement of this Product or
part-s thereof that are defective in title.

The warranty set forth in paragraph 1 does not apply to parts the
Operating Instructions designate as having a limited shelf-life or as
being expended in normal use.

THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED IN
LIEU OF (i) ANY AND ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,

INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE: AND (ii> ANY
OBLIGATION, LIABILITY, RIGHT, CLAIM OR REMEDY IN CONTRACT OR TORT,
WHETHER OR NOT ARISING FROM BACHARACH'S NEGLIGENCE, ACTUAL OR

IMPLIED.

The remedies of the Buyer shall be limited to those

provided herein to the exclusion of any and all other remedies

including,

without limitation incidental or consequential damages.
No agreement varying or extending the foregoing warranties, remedies
or this limitation will be binding upon Bacharach, Inc. unless in

writing, signed by a duly authorized officer of Bacharach.

NOTE: Fuses,

batteries and sensors are expendable items not covered

by the warranty.

NOTICE

This manual contains proprietary information that

shall not be reproduced or copied in whole or in

part as the basis for manufacture of items herein

described.

.

ADDENDUM ,i

Instruction 23-9613

TLV Sniffer@

Rev. No. 2

January, 1990

USE OF DILUTION PROBE 23-7355 WITH TLV SNIFFER
Dilution probe 23-7355 has an O-ring covering holes designed to admit fresh

air to dilute, by a factor of 10, any gas sample passing through the probe.
With the O-ring moved to expose the dilution holes, the 1O:l dilution ratio

enables the TLV Sniffer to indicate concentrations up to 100,000 ppm, thus

accommodating sample concentrations above the normal 10,000 ppm limit of the

Sniffer.

DETENT WITH 10 TO 1 AIR
DILUTION HOLES.

MOVABLE O-RING SHOWN IN AIR-DILUTION

POSITION. SLIDE O-RING TO COVER DILUTION
HOLES TO OBTAIN UNDILUTED SAMPLES.

It must be remembered that, when using this probe in the dilution mode, all
meter indications should be considered as approximate, only. This is true
because of several variable factors which can affect the probe operation,

such as:

1. The actual dilution ratio is dependent upon the flow rate of the
sample. The flow rate is affected by battery charge, speed of the pump,
cleanliness of the probe,

condition of the probe filter, etc.

2. The actual dilution

ratio

is dependent upon the quality of the air

which provides the dilution.

If the dilution holes are ingesting combustible

gases rather than fresh air,

the ppm indication of the Sniffer will vary
significantly from that of an indication obtained with fresh air entering
the dilution holes.

WARNING: At the extreme, of course, if the dilution holes and

the probe tip are sampling from the same atmosphere, no dilution
actually occurs.

In that instance,

if perfect dilution is assumed

when interpreting meter indications, an error of 1000% is incurred.

Addendum 1 to Instruction 23-9613
Rev.

1,

January 1990

@RegIstered Trademarks

REMRMBER:

@ For proper dilution,

only fresh air should enter the dilution holes.

0 Multiply all meter indications by a factor of 10 when using the probe

in the dilution mode.

0 All meter readings in the dilution mode should be considered as

approximate, only.

0 Don't forget to re-cover the dilution holes with the movable O-ring

to obtain undiluted gas samples.

-

-

Bacharach, Inc.

625

Alpha Drive, Pittsburgh, PA 15238 [phone]

.

NICKEL-CADMIUM

BATTERY

MAINTENANCE

DO:

1.

Recharge new NiCads before use.

It is a good idea to cycle them once or

twice before normal operation.

This requires three steps: (1) fully charging

the NiCads, (2) discharging until the unit ceases functioning or indicates low
battery power, and (3) fully recharging (12-16 hours).

2. Put NiCads through a charge cycle at least once a month when they are not
in use.

NiCads function best when they function frequently.

3:

Prevent

"memory" from occurring by running the NiCads through a full

discharge/charge cycle every week or two (once a month at least).

4.

Match charge time to use on about a two to one ratio (e.g., if you use

the NiCads for four hours

,

.charge them for about eight hours).

DON'T:

1.

Do not use new NiCads without putting them through a full charge.

2.

Do not attempt to use NiCads (or leave the instrument "0N")when the cells

' are fully discharged.

To obtain proper instrument operation, and to prevent

NiCad damage,

the cells must be recharged before further use.

3. Do not overcharge:
a.

Never leave NiCads charging for more than 16 hours.

b.

Do not charge over an entire weekend.

4.

Do not attempt to charge other types of batteries in a NiCad charger or

to charge NiCads in a charger other than one designed specifically for NiCads.

Issue Date: October 1981

P/N 51-9480

TECH NOTE

EXPLANATION:
The Nickel-Cadmium battery (NiCad) can best be thought of as an energy

reservoir.

Provided that it is properly filled with energy, it will-supply

that energy at a useful rate for many applications.

However, underfilling or
overfilling the reservoir can cause serious problems, including the destruc­tion of the system.

It is the purpose of this bulletin to explain how NiCads
should be mafntained to insure that they will last for the hundreds and even
thousands of energy transfers for which they are designed.

Most of the NiCads used in portable instruments are designed to carry an

energy supply sufficient to power the instrument for about 6-8 hours.

Because

of electrical and chemical losses, more energy must be put into the NiCads
than is drawn from them as they discharge while being used.

Therefore,

it

normally takes from 12-16 hours of charging time to refill depleted NiCads
completely.

If you use an instrument for 6-8 hours a day and then charge it

each night for 12-16 hours , you should obtain hundreds of cycles of NiCad use.

However,

if you use an instrument for varying periods of time each day, or if

you use it only occasionally, then the charging requirements ,become more

complex.

Due to some peculiar characteristics of NiCads,

the manner in &ich they.are

charged is crucial in .detertnining how well and how long they will function.

There are several things that can go wrong with NiCads, and it is important to
know what they are:

1.

If NiCads are used when they are almost totally out of energy, they can

be destroyed. This happens because the internal ionic structure of one of the

NiCad cells reverses polarity. Consequently, do not continue to use an

instrument with NiCads when the battery monitoring system indicates low or
depleted batteries. The instrument should be turned off and recharged before

being used again.

2. If NiCads are overcharged, they can be destroyed. NiCads work by means
of an internal chemical-electrical process, involving interaction of gases and

metals.

When NiCads are charged, gases are built up in the cells. If over-

charging occurs,

the gas pressure in the cell can become too high, causing

' internal damage in the cell and the possibility of an explosion. None of

Bacharach's NiCad systems should be left in a. charging condition for more than
16 hours; and, in general, 12-14 hours of charging should be sufficient. Do

not leave an instrument charging for an entire weekend, as it will almost
certainly cause overcharging, a reduction of the NiCad life, and even a safety
hazard.

Also, the charge time required

to

refill the NiCad reservoir is re-

lated to how

far

discharged the NiCad is. Thus,

if you have a NiCad system

designed to power an instrument for eight hours,

and you use it for only two

hours, you do not need to recharge it for a full 12-14 hour period. Instead,

3-4 hours of charging should be sufficient to return the unit to a full charge.

3.

NiCads 'lose energy when not in use.

NiCads have a shorter shelf life

than other kinds of batteries.

They will lose 25% of their charge in one

month of non-use, 50% in three months, and 85% in five months. This means two

things:

(1) you should apply a full charge to the NiCads supplied with a new
instrument before you use the instrument for the first time, and (2) if an
instrument remains idle for one month or more,

it should be charged before

use.

*

9-2

TECH NOTE

NiCads tend to develop a "memory." For example, if a set of Nicads is

for three hours every day and then recharged, the internal ionic

4.
used
structure will eventually tend to "memorize"

that cycle and the NiCads will

readily yield only three hours of service.

Once this "memory" occurs, no

amount of recharging will overcome it.

It will be necessary to discharge the

batteries almost completely (which may take considerably longer than normal)

. and then to recharge them in order to defeat the "memorized" ionic structure.

Sometimes this cycle (depletion/recharge) will have to be repeated two or
three times before the "memory" can be overcome.

.

The best way to insure against "memory"

is to fully cycle the NiCads periodi-

cally. That is, once every week or two,

leave the instrument on until the
battery indication shows a low reading or a recharge requirement (be careful
not to leave the unit on for too long),

and then charge the unit fully over­night (12-16 hours). This will revitalize the entire internal ionic structure
of the NiCads and will prevent "memory" from occurring.

9-3

a

SECTION 1

CONTENTS

PAGE

iz-

.

DESCRIPTION

PURPOSE AND FUNCTIONS.

...................... l-l

Toxicity Warning Function

...................

l-l

PPMMeter...........................l- 1

.

Search Function

........................ l-1

Continuous Self-Monitoring.

.................. l-l

PRINCIPLE OF OPERATION

...................... l&l

SENSITIVITY RANGES.

......................

.1-2

ACCURACYANDRELIABILITY

.....................

1-2

PHYSICAL DESCRIPTION

...................... : 1-3

Instrument and Case

....................... l-3

Air Sampling Mechanisms

.................... l-3

Combustible Gas Detector.

................... 1-4

AUXILIARY EQUIPMENT.

....................... 1-4

Probe and Hose.

........................ 1-4

Earphone.

...........................

l-4

Batteries

...........................

l-4

Battery Charger

........................

l-5

Recorder.

........................... l-5

CONTROLS .............................

1-5

Mode Selector

......................... l-5

ADJUSTMENTS ............................

1-5

Meter Zero Mechanical Adjustment Screw.

............ l-5

Meter Zero Coarse Adjustment Screw.

..............

l-6

Meter Zero Fine Adjustment Knob

................ l-6

Gain Potentiometer Adjustment Screws.

.............

l-6

Alarm Level Potentiometer Adjustment Screw.

..........

l-6

Recorder Level Potentiometer Adjustment Screw

......... 1-6

.

SECTION 2

2-l

PRE-OPERATION CALIBRATIONS AND ADJUSTMENTS

BATTERY TEST

........................... 2-l

SETTING METER POINTER TO ZERO.

.................. 2-1

SETTING METER POINTER DEFLECTION (GAIN CALIBRATION)

........

2-2-5

RESETTING ALARM RESPONSE

..................... 2-6

SETTING RECORDING.LEVEL.

..................... 2-7

SECTION &

OPERATION

MONITORING TOXICITP. . . . . . . . . . . . . . . . . . . . . . . . 3

-1

Direct Readings and Alarm . . . . . . . . . . . . . . . . . . . 3-l

Converting Hexane-calibrated Meter ppm Readings to ppm

Readings for Other Gases. . . . . . . . . . . . . . . . . . . 3-l

Converting ppm Readings to Percent Lower Explosive Limit. . . . 3-3

LOCATING GAS LEAK SOURCES. . . . . . . . . . . . . . . . . . . . . 3-4

SECTION 5

4-l

MAINTENANCE AND REPAIRS

SYMPTOMS ANDREMEDIES (TABLE). . . . . . . . . . . . . . . . . . .

4-1

REPLACING FAULTY COMPONENTS AND PARTS. . . . . . . . . . . . . . :4-5

Replacing Batteries . . . . . . . . . . . . . . . . . . . . . . 4-5

Replacing Detector. . . . . . . . . . . . . . . . . . . . . . . 4-5

Replacing Printed Circuit Board . . . . . . . . . . . . . . . . 4-5

Replacing Sample Pump . . . . . . . . . . . . . . . . . . . . .

4-6

SECTION 5

.5-l

REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . i .

5-1

ILLUSTRATIONS

FIGURE

l-l
2-l

2-2
2-3

2-4

3-l

3-2

4-l

TABLE
3-l

4-l

Troubleshooting Procedures. . . . . . . . . . . . . . . . . . . 4-l

TLV Circuitry Adjustment Potentiometer Locations.

.......

l-7

Bacharach Code 51-7199 Gas Calibration Kit.

..........

2-3

Calibration Gas Transfer Assembly

...............

2-3

Locating and adjusting R-13 on PPM X 100 Position

.......

2-5

Locating and adjusting R-3 for Certified Gas Indication

....

2-6

Use of Dilution Probe and Hose Assembly and I In-line

Filter and Trap Assembly.

..................

3-2

Conversion Curves Showing Relationship of PPM

Concentrations of Various Gases to Percent

L.E.L. Equivalents. . . . . . . . . . . . . . . . . . . . a . 3-4

TLV Sniffer Chassis Subassembly Showing Miniature

Pump Assembly in Disassembled Position. . . . . . . . . . . . 4-7

TABLES

.

Multiplying Factors for Converting PPM Meter Readings

of Hexane-calibrated Instruments to PPM

Concentrations of Other Gases . . . . c . . . . . . . . . . . 3-3

l-l

SECTION 1

DESCRIPTION

.

PURPOSE AND FUNCTIONS
Toxicity Warning Function

The portable TLV Sniffer is an extremely sensitive combustible gas and vapor
sensing instrument with an overall detecting sensitivity range,of from 1 to
10,000 parts of gas or volatile flammable vapor per million parts of air (by

volume).

The instrument is equipped with an audible (beep) alarm that can
be set to sound at any desired level of gas concentration to warn
automatically of toxic concentrations of gas.

Connections are provided for

an auxiliary earphone for use in noisy areas to assure that audible warnings

will be heard.

PPM Meter

-­A meter reading directly in parts per million (ppm) allows instant visual

determination of toxicity danger as readings are compared to published

standard Threshold Limit Values. The instrument can be calibrated to read
directly in parts per million for any one of many kinds of combustible
gases.

Factory calibration is for hexane unless otherwise specified, though
readings from other gases and vapors may be interpreted easily by means of
reading conversion cur(7es (in OPERATION Section, this manual).

Search Function
In addition to its primary function of indicating ppm combustible vapor

concentrations and toxicity levels, an ultrasensitive "search" range of from
1 to 100 ppm makes the TLV Sniffer especially useful for locating hard-to-

find gas leaks. A hand-held probe attached to the instrument can be moved

in the direction indicated by rising meter readings to point out quickly the
source of escaping gas.

Continuous ~Self-Monitoring
Other functions provided in the TLV Sniffer circuitry for continuous self-

monitoring purposes include a continuous,

audible note of warning in

response to failing batteries and to excessive negative drift in signal

voltage due to malfunctioning detector circuit components.

A 45-second time

delay circuit is incorporated to prevent the sounding of a false alarm due
to temporary

voltage

imbalances during thebrief warmup period after the

instrument mode selector switch has been set to operate the instrument.

PRINCIPLE OF OPERATION

-

To detect and measure concentrations of combustible gas in the air, the TLV

Sniffer catalytically oxidizes gas in a pumped-in sample of air by means of
a catalyst-coated resistance element.

The resistance of this element

changes with changes in heat that are proportional to the amount of oxidized

gas,

thereby altering the electrical balance of the catalytic element as

1-2

compared to the resistance of a reference element.

Both the catalyst-coated

("active") element and the reference element are

incorporated in a
Wheatstone Bridge circuit in such a way as to produce an electrical output
proportional to their differences in resistance.

Since any changes in air
sample temperature and humidity affect both active and reference elements
equally,

the electrical signal output is proportional to the concentrations
of combustible gas or vapor in the sample of air (expressed involumetric
terms as ppm). However,

sudden changes in humidity may affect the zero

reading

on

the

X-l range. The instrument should, therefore, be zeroed at

the same R.H. prevailing during use.

The audible alarm response at the desired gas concentration ppm level is

accomplished by comparing the gas concentration signal level with an
internal reference voltage.

Amplification of the difference between signal

and reference voltages will, at a preset level, operate the audible alarm.

SENSITIVITY RANGES

The TLV Sniffer circuitry and meter provide readings from 0 - 10,000 ppm in
three range settings.

The first, with MODE SELECTOR switch set at PPM X

100, indicates from 0 to 10,000 ppm

on

the meter. The second range, with

MODE SELECTOR

set

at

PPMX 10, gives readings between 0 to 1000 ppm. The

third range setting,

at MODE SELECTOR position PPM X 1, provides readings

from 0 to 100 ppm.

Each range setting requires an easily made adjustment of

the ZERO ADJUST control knob on the instrument front panel to set the meter

indicating pointer to zero.

Span adjustments for full-scale pointer

deflection within each range are made periodically as necessary by means of

three gain potentiometers located within the instrument.

ACCURACY AND RELIABILITY
The extent to which meter readings correspond to actual parts per million of

combustible gases in sampled air depend upon (1) the internal electrical
stability of the instrument, (2) proper calibration of the instrument on gas

mixtures of known concentration,

and (3) purity of the air sample used for

meter pointer zero setting.

The electrical stability of TLV Sniffer circuitry is best demonstrated with
the MODE SELECTOR switch set

at

PPM X 1. In this most sensitive range of
the instrument, all gas signal voltages are multiplied by 100, so that a O­to l-millivolt signal actually drives the meter pointer with the necessary 0
to 100 millivolts to achieve full-scale deflection. Thus a pointer
deflection of l/100 sensitivity of the TLV circuitry to minute electrical
changes, the meter needle shows practically no deflection as power is
applied to the speaker for the audible beep signal.

Given this electrical stability,

any lack of correspondence between actual

parts per million of combustible gas and the meter readings would be much

more Likely to arise from improper calibration of the instrument, or from

setting meter zero in

the

presence of impure air

than

from instability of

the TLV Sniffer circuitry.

Calibrated for hexane gas (a relatively high-energy gas) at the factory, the
TLV Sniffer should also provide accurate ppm readings for benzene, toluene,
and other gases of similar combustion rates. Conversion curves aid

in

correctly interpreting readings from combustible gases that release energy

at different rates.
Thus, purity of the air sample used for meter pointer zero settings'is by

far the most important factor in obtaining accurate ppm readings. Ideally,
the pointer should be zeroed in the PPM X 1 mode of operation, where

deviations from zero would be more apparent because of maximum deflection.

In this range, however,

extreme sensitivity causes the instrument to respond
to the slightest traces of gas. Wisps of cigarette smoke, fumes from
passing autos,

and subtle air contaminations from many other sourcesmay

affect the zero setting.

The extent to which zero readings are biased
because of air sample impurities will be reflected in less accurate readings
of actual gas concentration ppm.

Frequently,

an apparent negative drift of

the meter pointer may be caused by carrying the instrument

to

an area of
fresher air after zeroing the meter inadvertently on air that was not as
pure.

PHYSICAL DESCRIPTION

Instrument and Case

--

The TLV Sniffer is housed in a sturdy, brushed-aluminum and blue, wrinkle­finished plastic case.

An attractively designed carrying handle serves also
as an adjustable support stand and shoulder strap holder. Weighing 5-l/2
lbs.,

the compact 8-x6-l/2-x3-l/4-inch instrument is as convenient to carry

as a transistor radio.

A front panel

,

easily visible with the instrument in

carrying position, contains a meter reading directly in ppm, and control

knob for range selection and zero setting of the indicating meter pointer.
The side panels of the instrument provide plugs and connectors for an air

sample probe, earphones, battery charger, and recorder. Removal of ten
screws holding the rugged plastic cover to the rigid aluminum case gives
access to batteries and calibration adjustment controls located within the
interior of the case.

TLV Sniffer Models

The TLV Sniffer is available as a standard model 0023-7350, for use in areas
known

to

be free of combustible gases and vapors, or as an intrinsically

safe model 0023-7356,

for use in hazardous areas designated Class I,

Divisions 1 or 2 by the National Electrical Code.

Model 0023-7356 has been

certified to be intrinsically safe by the Factory Mutual Laboratories.

Air Sampling Mechanisms
The TLV Sniffer air sampling system consists of a short intake connection

leading directly into an interior aluminum air chamber holding the detector,
a six-inch length of tubing connecting the chamber and a miniature sample-

drawing pump, and a three-inch length of tubing to an exhaust port on the

left side of the instrument

*

case.

1-4

Combustible Gas Detector

The combustible gas detector consists of an "active" catalytic-coated

-\.
resistance element to oxidize combustible gas, and an identical second
resistance element without the catalyst coating which provides a "reference"

0

resistance value unaltered by the oxidation of combustible gas.

Since both

operate at approximately equal temperatures,

only changes in gas content of

sampled air cause differences in resistance between the two to produce

4

signals to the meter and gas alarm circuits.

Both active and reference
elements are protected within a porous bronze cylinder that plugs into a
mounting block attached with four screws to the air chamber block.

The

.

three-pronged mounting block connects inturnto a cylindrical plug with

wires that connect to circuitry on the instrument circuit board.

AUXILIARY EQUIPMENT
Probe and Hose, 0023-7243, and Dilution Probe and Hose, 0023-7355

-­A five-foot-long flexible hose and probe assembly, for sampling air at

specific points to find exact locations of gas leaks, attaches to a fitting
on the left side of the case by means of a snap-fitting, spring-loaded
collar that can be drawn back with one hand, A cottondustfilter within
the probe protects the sample drawing lines and chamber from intrusion of
dust and dirt.

The dilution probe 0023-7355 has an O-ring covering holes
designed to admit air to dilute the sample 10 times. With O-ring moved to
expose dilution holes,

the instrument reads up to 100,000 ppm to accommodate

sample concentrations above the normal 10,000 ppm limit.

(See Figure 3-l.)

An in-line filter and trap assembly 23,-7341 is available for use in dust-

or moisture-laden atmospheres.

Earphones
An earphone set of lOO-ohm impedance may be attached to an earphone jack

plug on the right side of the TLV Sniffer case wherever noise in an area to
be tested obscures the audible signal from the speaker of the instrument.
The earphone circuit does not cutout the audible speaker signal when the

earphone is attached, but rather provides a second way to hear the signal

where noise conditions so require.
Batteries

For standard model TLV Sniffer:

The portable TLV Sniffer standard model is
powered by six D-size dry-cell batteries inserted in tubes and spring clamps
within

the

instrument case

at

the

rear.

Though

any

kind of D cells maybe

used, nickel-cadmium rechargeable batteries are recommended for longest

uninterrupted service (six to nine hours of continuous service).

The

instrument circuitry is so designed that an audible tone sounds when battery
power falls below that required to sustain gas detection operations.

1-5

For intrinsically safe model:

The Intrinsically Safe battery pack is
similar to above, but the battery consists of six nickel-cadmium cells
connected by welded links to prevent arcing.

The cell assembly is enclosed

0

in a rivet-sealed, high-impact,

plastic

wire-wound resistors that limit current

.-.

conditions to levels below that which

mixtures of combustible gas and air.

Battery Charger

W

housing with protective fuses and

capacity even under short-circuit

would ignite the worst possible

A compact battery charger (230 VAC:

#0023-7353; 115 VAC: #0023-7230) with

a plug-in connector may be attached to a jack provided in the right side of

the instrument case.

For stationary testing, the TLV Sniffer may be

operated with the charger connected.

For portable operations, the charger

may be used to rejuvenate batteries within the instrument overnight, The

intrinsically safe battery packmay be recharged either in or outside the
instrument.

Recorder
A recorder (range: O-100 mv; impedance:

10,000 ohms or greater) may be
connected to the TLV Sniffer for use if variations in combustible gas levels
are to be recorded for study or legal data.

Recording is more suitable for

the PPM X 100 and PPM X 10 mode ranges.

The ultrasensitive PPM X 1 "search"
range, responsive from 1 to 100 ppm of gas, is not as suitable for an
accessory recorder because of the small magnitude of the signal and the
potentially rapid fluctuations of the signal within the range in response to

small changes in detected quantities of combustible gas.

CONTROLS
Mode Selector
The MODE SELECTOR control knob at lower right on the instrument panel

operates a rotating gang switch with an OFF position, a battery test switch,
and three range-selector switch positions that allow a choice among three

sensitivity ranges for readings of 0 - 100 ppm, 0 - 1000 ppm, or 0 - 10,000
ppm on the meter scale.

ADJUSTMENTS

Meter Zero Mechanical Adjustment Screw

-­The meter pointer mechanical adjustment screw is located within the

instrument on the back side of the meter barrel near the - terminal. This

adjustment screw is factory set,

and does not ordinarily require subsequent
attention. Any adjustment of this screw should be done with the MODE
SELECTOR knob turned to the OFF position.

l-6

Meter Zero Coarse Adiustment Screw (Figure l-1)

--

The met er pointer coarse adjustment is accomplished by means of a small

potenti

.ometer adjustment screw located immediately under the ZERO ADJUST

knob at

lower left on the instrument panel. In fresh air, with power on,

0

with the MODE SELECTOR control knob set to PPM X 100, and with the ZERO

ADJUST knob turned to midpoint,

this screw should be slowly turned to

position the pointer to zero on the meter scale.

Meter Zero Fine Adiustment Knob (Figure l-1)

--­In the presence of fresh air, the ZERO ADJUST knob at lower left on the

.

instrument panel may be turned to.adjust the meter pointer to zero -- first

for the PPM X 100 range, then the PPM X 10 range, and lastly for the PPM X 1
range --

just

before

using the instrument to detect combustible gas. If

adjustment of this control does notbringthe pointer

to

zero, the coarse
zero-adjustment screw directly below may be turned to provide a greater
latitude of fine-adjust control. If the coarse adjustment eventually fails
to provide latitude for the fine-adjust control to operate,

in all

probability the replacement of an exhausted detector element is indicated.
Gain Potentiometer Adiustment Screws (Figure l-1)

Three gain potentiometer adjustment screws accessible with the instrument

cover removed, are located

on

the

circuit

board

at

lower right within the

instrument case.

With sample calibration gas of known concentration applied

to the air sample intake of the instrument, these screws are turned to

adjust amplifier gain for the correct amount of pointer deflection across

the meter scale.

(See OPERATION Section.) Separate potentiometer screws,

marked X10, X100, and Xl,

are provided for each of the three scales

available by means.of the MODE SELECTOR knob.

Alarm Level Potentiometer Adjustment Screw (Figure 1-l)

The alarm level adjustment screw may be turned to set the audible alarm to
respond at any desired degree of pointer deflection across the meter dial.
The standard factory setting,

which causes the alarm to respond at a meter

reading of 50,

may be reset to correspond to the ppm Threshold Limit Value,

or to any arbitrary figure.

Record Level Potentiometer Adiustment Screw (Figure l-1)
The level of signal outputs to an accessory recorder may be set by turning

the adjustment screw marked

"RECORDER" on the potentiometer assembly within

the instrument case at bottom right.

Alarm

Trigger

Point

.

-Adjuster (x2) (w/ 1

(NOTE: Standard

model fflustra.ted.

\.

Adjuster locations

typical

for intrinsically safe

\/f Fine

Zero

Adjust

(R26\

/ i’

model also.

)

,;

Voltage

Adjuster (R20)

Offset Adjuster

(RP3)

Figure l-l.

TLV Circuitry Adjustment Potentiometer Locations.

2-l

PRE-OPERATION

SECTION 2

CALIBRATIONS AND ADJUSTMENTS

Prepare the TLV Sniffer Combustible Gas Detector for operation in accordance

L

with the following steps:

BATTERY TEST

*

Test battery as follows: Turn MODE SELECTOR knob from OFF position to BATT
TEST ,position, Meter pointer should come to rest in BATTERY GOOD range of
meter scale.

(Both a meter reading below BATTERY GOOD range and an audible

signal warn of batteries too weak to sustain normal operation.)
SETTING METER,POINTER TO ZERO

--

Set pointer to meter zero as follows:

1.

2.

3.

4.

5.

6.

i

7.

t

Attach air sampling probe connector to instrument intake on left side of

case by pulling back spring collar of connector , pressing connector

over

intake, and releasing spring collar,

Place TLV Sniffer inpositionin whichmeter indications willberead

(usually in meter-up position).

NOTE:

Heat distribution from active and reference filaments of the

detector sensor changes from vertical to horizontal position.

The

resulting change in electrical balance between elements causes a shift

in pointer zero from one position to the other.

Set MODE SELECTOR switch to PPM X 100 and operate instrument for 10

minutes to allow circuits to stabilize.

In fresh air, set ZERO ADJUST knob

at

midpoint (five full

turns

from

either extreme position). If fresh air is not available, use Bacharach

Kit #51-7199 to apply known pure air to the Sniffer intake (instructions

in kit).

Turn coarse adjustment screw,

located under

ZERO

ADJUST

knob,

to move

meter pointer to zero on the meter scale.

Turn MODE SELECTOR to PPM X 10 position and turn ZERO ADJUST knob to set

pointer to zero.

Turn MODE SELECTOR to PPM X 1 position and turn ZERO ADJUST knob to set
pointer to zero.

NOTE:

The TLV Sniffer is extremely sensitive in the PPM X 1 range.

~02 from breath too close to the intake,

cigarette smoke, auto fumes,

etc.,

can interfere with accurate setting of the pointer to meter zero,

2-2

SETTING METER POINTER

Quantitative Gas Test (Refer to Figures 2-1, 2-2, 2-3 and 2-4)

DEFLECTION (GAIN CALIBRATION)

To ensure proper operation and to check calibration, it is necessary
periodically check the instrument against a known, standard blend
calibrating gas.

to

a

of

i

The Bacharach Code 51-7199 Gas Calibration Kit and optionally available Code

51-1120 Certified Gas Cylinder containing 500 PPM Hexane-in-air are readily
available to meet this requirement.

I

Refer to Figure 2-1, the Calibration Kit consists of the following:

Item

No.

Code No.

Description

Qtre

1 51-1201
2

06-6163

3 03-5393

4

03-4318

5 03-5532

6

03-6351

7 51-1127
Optional items may be

8

51-1120

9.

Not

51-7131

Shown

Flowmeter Mtg. Bracket
Flowmeter
Quick Connect Ftg.
Regulator
Tee 3/16" (plastic)
Rubber Tubing
Barbed Hose Ftg. (connected to

Regulator Assembly)

ordered separately:

Cylinder Hexane-Air mixture

(certified 500 PPM)

Zero Calibration Gas (Compressed Air)

1.
1
1
1
1
5 ft.

1
1
1

Refer to Figure 2-2 and connect the gas transfer assembly as shown, making

:

certain all connections are air-tight.

Use the retaining clips (2 each) to
mount Flowmeter (06-6163) to its Mounting Bracket (51-1201). Make certain
to connect rubber tubing at the base inlet connection on the Flowmeter, then
to the barbed fitting on the Regulator and to the Quick Connect fitting
previously installed on the TLV Sample-In (inlet fitting).

Turn Regulator
Valve (03-4318) fully counterclockwise (closed position) before attempting'
to screw regulator into calibration gas tank.

NOTE :

DO NOT OPEN REGULATOR VALVE AT THIS TIME.

-

.

Figure Z-l. Bacharach Code 51-7199 Gas Calibration Kit

Figure 2-2. Calibration Gas Transfer Assembly

Properly Hooked Up.

2-3

2-4

This test is to be performed in a clean,

fresh air (combustible-free)

environment.

If this is not possible, refer to Figure 2-2 and substitute

Code 51-7131 Zero Calibration Gas for the Code 51-1120 Cylinder of Hexane-

Air mixture.
Disregard Step 1) and connect the gas transfer assembly at the TLV Sample-In

(inlet> fitting before performing Steps 4) and 5).

Open the Regulator Valve (clockwise) and adjust for flowmeter indication of

(1) cfh to ensure adequate pump flow.

Remove Code 51-7131 Zero Calibration Gas and

substitute

the Code 51-1120

Cylinder of Hexane-Air mixture before proceeding with Step 6).
To calibrate the instrument in fresh air (combustible-free) environment,

proceed as follows:

1) Remove case cover for access to internal adjustments and temporarily
break gas transfer assembly connection at the TLV Sample-In (inlet)

fitting.

2)

Turn FINE ZERO ADJUST (pot) full clockwise and then five turns

counterclockwise to mid-range. Then turn COARSE ADJUST (pot) full

clockwise and then ten turns counterclockwise to mid-range.

3)

Turn MODE SELECTOR TO BATT. TEST position. The meter pointer must

indicate within BATTERY GOOD range, if not recharge.

Refer to Figure 2-4 locating TP-3 and connect a Voltmeter between TP-3
(+I and ground (-1, check for 6VDC.

If not, refer to Figure 2-3

locating R-20 and adjust for 6VDC 2 .Ol VDC.

4)

After allowing for five-minute warm-up, turn MODE SELECTOR switch to

PPMXlOO position and adjust R-13 (see Figure 2-3) for meter pointer
indication of scale zero.

5)

Turn MODE SELECTOR switch to PPMXlO position and adjust COARSE ADJUST

for meter pointer indication of scale zero. Readjust per Steps 4 and 5
until meter pointer indicates a relatively constant scale zero when
MODE SELECTOR is switched between PPMXlO and PPMXlOO range.

6)

Turn MODE SELECTOR switch to PPMXlO position.

Reconnect Gas Transfer

Assembly to TLV Sample-In (Inlet> fitting.

Open Regulator Valve

(clockwise) and adjust for Flowmeter indications of (1) cfh to ensure
adequate pump flow. Allow one minute for meter pointer to achieve
maximum indication (refer to Figure 2-41, adjust R-3 the X10 Span

Adjuster until meter pointer indicates mid-scale (SO> or 500 ppm.

Remove gas,

close Regulator Valve (fully CCW) and allow about two

minutes for meter pointer to return to zero.

2-5

- R-13

. R-20

l

Figure

2-3.

Locating and adjusting R-13 on PPMXlOO position

7)

8)

9)

10)

for meter pointer indication of scale zero.

Turn MODE SELECT switch to PPMXlO position. Then turn the FINE ZERO
ADJUST until

meter

pointer indicates

full

scale1000 ppm. Turn MODE
SELECT switch to PPMXlOO position and adjust R4 the Xl00 Span Adjuster
until meter pointer indicates (10) or 1000 ppm. Turn FINE ZERO ADJUST
until meter pointer indicates scale zero.

Turn MODE SELECT switch to PPMXlO position, then turn FINE ZERO ADJUST

until meter pointer indicates 10 on the scale or 100 ppm.

Turn MODE SELECT switch to PPMXl position and adjust the Xl Span
Adjuster until meter pointer indicates 100 (full scale) or 100 ppm.

Turn FINE ZERO ADJUST

until

meter pointer indicates scale zero. The
TLV is now calibrated and ready for use on the low range O-100 ppm as a
gas leak detector.

,

2-6

FINE ZERO

ADJUST

R2Xl

R3XlO

- R4XlOO

- TP-3

COARSE

/

ADJUST 1

Figure

2-4.

Locating and Adjusting R-3 for certified
Gas Indication of 500 ppm on the meter.

RESETTING ALARM RESPONSE

If factory set alarm response at midpoint of the meter scale is not

suitable, reset alarm response level as follows:

1.

Turn meter zero coarse adjustment screw (located under ZERO ADJUST

control knob at lower left on instrument panel) to set meter pointer to

desired alarm point on meter scale.

2. Turn ALARM potentiometer adjustment screw until audible alarm sounds.

3. Turn meter zero coarse adjustment screw to return pointer to zero on
meter scale.

2-7

SETTING RECORDING LEVEL
If recorder (range: O-100 mv; impedance:

18,000 ohms or greater) is to be

used,

attach accessory recorder jack to RECORDER plug in right side of

instrument case and set recording level as follows:

1.

Set MODE SELECTOR knob to PPM X 100 or PPM X 10 as desired and apply
combustible gas to instrument intake.

2.

Turn RECORDER potentiometer adjustment screw until accessory recorder

response corresponds with meter readings as desired.

3-1

SECTION 2

0

OPERATION

MONITORING TOXICITY

Monitor combustible gas and vapors to determine concentrations with respect

b

to Threshold Limit Values as follows:
Direct Readings and Alarm

--

1.

2.

3.

4.

*

5.

6.

7.

Turn MODE SELECTOR control knob to BATT TEST position and read condition
of battery on meter dial. Install new or recharged batteries if
necessary.

Turn MODE SELECTOR control to desired operating range, selected in
accordance with the Threshold Limit Value for the toxic gas to be
monitored (PPM X 1 for TLV from ,O to 100 ppm; PPM X 10 for TLV from 0 to
1000 ppm; PPM X 100 for TLV from 0 to 10,000 ppm>.

Allow ten-minute warmup period with instrument in same position as it is

to be used in service (meter facing up or meter facing to the side).
In fresh air before entering monitoring area, turn ZERO ADJUST

knob until meter pointer resets on zero.
For monitoring in noisy areas,

insert jack of accessory earphone

on right side of instrument case.

in plug

Enter monitoring area and read ppm gas concentrations on meter. Audible
warning sounds if gas concentration causes readings at mid-point of

scale or above,

or if toxic Threshold Limit Value has been exceeded,

provided the alarm has been set for this response.

control

For readings .above 10,000 ppm: Replace probe assembly 0023-7243 with
dilution probe 0023-7355 and slide dilution probe O-ring to expose
dilutionholes of probe (extends range 10X to read

up

to

100,000 ppm).

See Figure 3-l.

Add in-line filter and trap assembly if sampling in

dust- or moisture-laden areas.

Converting Hexane-calibrated Meter PDF Readings to ppm Readings for Other

--

Gases
Hexane gas is commonly used for factory calibration and subsequent in-

service recalibration8 of the TLV Sniffer.

To determine ppm concentrations

of gases other than hexane with instruments calibrated for hexane, multiply

the ppm meter reading by the factor for the gas detected as listed in the
table below.

(Note meter range setting in making ppm readings and

calculations.)

To install in-line filter:
Pull back spring-loaded
retainer ring and press
fitting over connector
on

side of sniffer

TLV SNIFFER 23-7350 or 23-7356

To install probe

II

and hose assembly

spring-loaded r

and press fitting

over filter

connector.

Use in dust-or moisture-laden

atmospheres .

Movable O-ring shown in air-dilution

position.

Slide O-ring to cover dilution holes

to obtain undiluted samples.

DILUTION PROBE AND HOSE ASSEMBLY

23-7355

3-3

Table 3-l.

Multiplying Factors for Converting ppm Meter Readings of Hexane-

calibrated Instruments to ppm Concentrations of Other Gases.

0

(Approximations)

.

.

Gas Detected

Factor

Gas Detected

Factor

r

Acetone
Acetylene
Acrylonitrile

.

Benzene

1,3-Butadiene
Butane

Butyl Acetate

Carbon Disulfide
Carbon Monoxide
Cyclohexane
Ethane
Ethanol
Ethyl Acetate
Ethyl Ether
Ethylene

Ethylene Oxide
Heptane
Hexane
Hydrogen

1.50

1.78

1.54

1.02

1.52

1.04

2.08

5.92

5.11

1.02

1.36

1.90

2.22

1.30

1.38

2.05

1.05

1.00

1.45

Hydrogen Sulfide

18.60

Isopropanol

1.59

M.E.K.

1.60

Methane

1.58

Methanol

3.71

Methyl Acrylate

3.37

Methyl Chloride

4.02

Methyl Chloroform

4.44

Pentane

1,04

Perchlorethylene

13.66

Propane

1.14

Propylene

1.30

Styrene

2.25

Tetrahydrofuran

1.41

Toluene

1.03

Trichloroethylene

6.40

Vinyl Acetate

2.00

Vinyl Chloride

2.24

o-Xylene

1.64

Convertinqppm Readings to Percent Level of Lower Exnlosive Limit (XL.E.L.1

-

---

To determine gas concentration levels in terms of percent of lower explosive

limit (% L.E.L.) from direct ppm readings for hexane or from calculated ppm

concentration levels for other gases:

1.

Read ppm on TLV Sniffer indicating meter.

2.

On O-to-lO,OOO-"PPM CONCENTRATION IN SAMPLE" horizontal scale at bottom
of % L.E.L. Conversion Chart, Figure 3-2,

locate position left-to-right

representing ppm reading.

3.

On slanted chart line representing kind of gas detected, find the'point

in vertical alignment over ppm reading point on horizontal scale.

4.

On vertical scale at left labeled % L.E.L. EQUIVALENT," read the
percent-of-lower-limit equivalent found in horizontal alignment with the

.

point located on the slanted line.

3-4

90-

70-

t
2

60

s

// //

i

so-

2

ETHYLENE

s

0

ETHANOL
VINYL CHLORIDE

METHANE

PPM CONCENTRATION IN SAMPLE

Figure 3-2.

Conversion Curves Showing Relationship of PPM

Concentrations

of Various Gases to Percent L.E.L.Approximate

Equivalents.

LOCATING GAS LEAX SOURCES

--

To utilize the TLV Sniffer in searching for gas leaks
hoses,

containers, etc.:

1.

Set MODE SELECTOR control knob to PPM X 1 position.

in tanks, pipes,

2.

Search

for exact location of leak with probe.

Meter reading will

increase as leak is approached and decrease as probe moves away from
leak.

4-1

SECTION 4

MAINTENANCE AND REPAIRS

.

SYMPTOM POSSIBLE CAUSE

REMEDY

SYMPTOMS AND REMEDIES
Gradual exhaustion of the detector element,

eventual wearing of air-sample
pump parts,batteryrecharging orreplacement,etc., require an amount of
maintenance and repair work over an extended period of time.

The following

table describes symptoms, possible causes,

and remedial actions relating to

conditions requiring maintenance and repairs.

TABLE 4-1

TROUBLESHOOTING PROCEDURES

Meter pointer drifts Traces of combustible

Adjust pointer to zero

from zero.

gas in air sample

in fresh air.

Use Bach-

thought to be pure.

arach Kit 51-7199 if
fresh air is otherwise
unavailable.

Change of position of

Keep instrument

instrument from upright

consistently in either

to horizontal or vice

vertical or horizontal

versa,

thus redistribu-

position while in use.

ting heat between active
and reference elements
of the detector.

Insufficient warmup

period.

Allow lo-minute warmup

period before zeroing
meter pointer.

Erratic monolithic

Consult factory or

chip.

replace circuit board.

Erratic sensing
element.

Replace detector.

4-2

TABLE 4-1 (continued)

SYMPTOM POSSIBLE CAUSE

REMEDY

False sounding of Change of position of
audible gas alarm.

instrument distributes

more heat to detector

active element.

(Meter reads in

alarm zone)

Intrusion of cigarette
smoke, auto fumes, or
other common combustible

gases or vapors.

Keep instrument consist-

ently in one position

while in use-

Wait for intruding

combustibles to pass;

move away from source;
remove source.

Incorrect setting of

alarm level.

Reset alarm level

consistent with appro­priate Threshold

Limit Value.

Faulty monolithic
chip.

Consult factory or re-

place printed circuit
board.

Faulty detector or

Replace detector; make

1

detector lead

lead connections clean

connections. and tight.

Continuous tone

Run-down battery.

audible signal; meter

Recharge or replace

batteries.

pointer to left of
BATTERY GOOD zone

of meter with control
set to BATT TEST.

Negative (downscale)

Meter pointer set to

Set pointer to zero

drift of meter

zero on impure air

pointer (audible alarm

with pure air sample.

sounds at minus 10%)

sample, then responding

to purer air.

Faulty detector.

’

Replace detector.

Faulty monolithic
chip.

Consult factory or
replace circuit board.

4-3

TABLE 4-l (continued)

0

SYMPTOM

POSSIBLE CAUSE

REMEDY

No audible alarm in

Operation of 45-second Wait approximately 45

presence of strong

delay circuit after seconds for delay period

. .

',

concentration of

turning MODE SELECTOR to expire.

combustible gas.

control to operate
instrument.

-L

Improper setting of

Reset alarm to desired

alarm response level.

level.

Faulty monolithic

chip.

Consult factory or
replace circuit board.

Faulty alarm circuit.

Replace printed circuit
board.

Loose lead to speaker;

Inspect for loose leads.

damaged speaker.

Using 0-15V range
voltmeter, check for

excitation voltage
across speaker
terminals while meter

indicates in alarm zone.

Dead batteries. Confirm battery

exhaustion at meter

with MODE SELECTOR

switch in BATT TEST
position. Recharge
or replace batteries

if necessary.

4-4

TABLE 4-l (continued)

SYMPTOM POSSIBLE CAUSE

REMEDY

0

Inability to set

calibration for
proper reading on
known gas sample.

Error in sample;

Apply

another

known'

sample cylinder empty. gas sample; compare

sample response with

that of a known good

instrument.

Inadequate sample

flow.

Check for air leak

in sample hose, probe,

or external connections.

(Plugging probe inlet

will stall pump if no

leak exists.) Examine

pump piston and
diaphragm. Repair or
replace faulty components
and parts.

If in only one range:

Check potentiometer

faulty calibration. resistance with

ohmmeter.

Replace

if necessary.

Faulty sensing

element.

Replace detector.

4-5

Replacing Batteries
Replace batteries, if 'necessary, as follows:

1,

Remove ten screws used to hold cover to case and remove cover.

2. Standard model:

Remove two battery assemblies (three batteries in each

of two cardboard tubes) from spring clips in back of case.

*

Intrinsically safe model:

Replace entire sealed battery pack. The

following steps 3 and 4 do not apply.

1

3. Standard model:

Remove old batteries from tubes and replace with new
batteries. Orient plus and minus battery terminals as indicated by
arrows with polarity signs on battery mounting panel.

4.

Standard model:

Snap replacement batteries with tubes into battery

holding clips.

Spring terminals at one end may be held back with a

small

screwdriver

or similar

tool

to

facilitate insertion of battery

assemblies in clips.

5. Replace cover and attach with ten screws.
Replacing Detector
Replace detector when necessary as follows:

a

2.

3.

4.

5.

6.

Remove instrument case cover to gain access to detector housing.
With instrument in speaker-down position, remove four screws used to

attach detector socket assembly to cubical aluminum air sample chamber.

Lift detector socket assembly from air chamber block.

Unplug old detector from socket assembly.

Insert new detector in socket. New detector part number should
correspond to that listed on label affixed to cover of instrument (#800-

080.90).

Reinstall socket assembly with new detector in air chamber and replace

instrument cover.

Tighten screws uniformly and snugly.

E

Replacing Printed Circuit Board

Replace printed circuit board, when necessary, as follows:

1. Remove instrument case cover to gain access to printed circuit board.

2. Using Allen wrench,

remove two small setscrews used to hold MODE'

SELECTOR knob to shaft and remove knob from shaft.

3.

Remove hex head nut used to hold MODE SELECTOR switch shaft to

instrument panel.

4-6

4.

Using hex head nut driver,

remove plugs and insulating

recorder and earphone jacks on outside of instrument case.

washers for

5.

Remove two screws used to attach battery charger plug to case.

6. Disconnect terminal clips and soldered connections of all wires leading
from printed circuit board to battery terminal block, speaker, meter,
coarse zero adjustment potentiometer, and fine zero adjust

potentiometer.

4

7,

Remove four screws used to hold speaker mounting panel

to

instrument

s

case.

8. Slide speaker mounting panel as necessary to free recorder and earphone
plugs and MODE SELECTOR shaft from case. Remove circuit board from

case.

9.

Install new circuit board, part #23-4441.

Replacing Sample

Pump

Replace air sample pump, when necessary, as follows:

1. Remove cover of instrument case to gain access to air sample pump.

2. Turn fastener stud #0002-8059 l/4 turn to release miniature pump

assembly from chassis panel.

3. Disconnect pump motor leadwire terminals from battery terminal strip.

4. Disconnect flexible plastic sample tubes from intake and exhaust ports
of pump air chamber.

5. Remove pump assembly from instrument.

6. Install replacement pump and connect motor leadwires and flexible
plastic

tubes as shown in Figure 4-1.

7.

Operate instrument to test new pump.

Replace cover.

I. S. (intrhsically safe) Battery Pa&

MINIATURE PUMP ASSEMBLY

0023-4491

\

,TUBING, l/4

\

Standard Model: 6

Ni-Cad

3 14-070-00

SPEAKER Cells in Tubes

0023-4150\

\

04-0696

0002-3885

CHASSIS

SUBASSEMBLY

0023-4633

5-l

REPLACEMENT PARTS LIST

--

z SNIFFER (Standard Model 0023-7350: Intiinsicallv

Safe Model 0023-7356)

b

c

*

*

.

*

*

**

*

*

ITEM

Calibration Kit
Connector, Tubing
Cover, Instrument

Dry Cell (alternate

to

Ni-Cad Cell; 6 required)
Earphone
Element, Detector
Filter, In-line Dust and Moisture Trap
Filter, Probe (box of 24 refills)
Fuse (for Intrinsically Safe battery pack)

Handle
Hexane Tank (500 ppm)

I.S. (Intrinsically Safe) Battery Pack

Knob, Control

Knob, Handle

Ni-Cad Cell (preferred for standard model; 6 required)
Printed Circuit Board Assembly-Std. Model
Printed Circuit Board Assembly-Intrinsically Safe
Probe and Hose Assembly
Probe and Hose Assembly, Dilution
PumpAssembly
Pump Bellows (replacement)
Pump Check Valve (replacement; 2 required)
Recorder Plug,

Switchcraft #755

Screw, Cover Mounting (10 required)

Finishing Washer (10 required)

Spacer, Handle
Speaker

Tube, Battery (standard model; 2 required)

Tubing, l/4 O.D. x l/16 wall

*

Standard model only

**

Intrinsically safe model only

STOCK'NO.

0051-7199

0003-6152

0023-4454

3600-3100

0023-0605

8000-8090
0023-7341
5500-7000
0204-2703
0023-4445
0051-1120
0023-7354
0023-4443
0023-4444

0004-0030
0023-4441

0023-4778
0023-7243
0023-7355
0023-4773

0023-0018
0023-4218

---

01-3461

102-4062
0023-4647

0023-4150

23-2313

03-6105