H-25C
INDUSTRIAL HALOGEN LEAK DETECTOR
Instruction 3015-0216
Operation & Maintenance
Rev.0
Product Leadership z Training z Service z Reliability
H-25C Instruction Manual
Table of Contents
Introduction ..................................................................................................................................4-9
1. H-25C Leak Detector Applications.................................................................................................................... 4
2. Unpacking and Initial Checks............................................................................................................................4
3. Warranty............................................................................................................................................................4-5
4. Procuring and Storing Frequently Replaced Maintenance Items .....................................................................5
5. Operating Precautions ......................................................................................................................................5-6
6. Preparing for Use ..............................................................................................................................................7-8
7. Special Symbols and Formatting Used in this Manual .....................................................................................9
1. Names and Functions of Components..................................................................................10-14
1.1 Components Names and Functions .................................................................................................................10-11
1.2 Model Codes ..................................................................................................................................................... 11
1.3 Specifications ....................................................................................................................................................12
1.4 Probes...............................................................................................................................................................13
1.5 Accessories and Maintenance Tool .................................................................................................................13-14
1.6 Internal Flow List ...............................................................................................................................................14
2. Preparing for Use....................................................................................................................15-25
2.1 Installing the Sensor.......................................................................................................................................... 15
2.2 Setting the Switches..........................................................................................................................................16
2.2.1 Setting the “Supply Voltage” (type of AC voltage used) switch.............................................................16
2.2.2 Setting the “GAS” (Type of Gas) switches ............................................................................................16
2.2.3 Setting the”UNIT” (Unit State Selector) switch......................................................................................16
2.2.4 Setting the “RELAY” (Relay State Selector) switch...............................................................................17
2.2.5 Setting the “MODE” (Measurement Mode Selector switch ..................................................................18
2.2.6 Setting the Alarm Point ..........................................................................................................................18
2.2.7 Setting the “CAL” (Calibration Mode Selectorl) switch..........................................................................19
2.2.8 Setting the “CAL INTVL” (Calibration Request Interval) switch.............................................................19
2.2.9 Setting the “GAIN” (Search Mode Sensitivity).......................................................................................20
2.3 Connecting the Probe .......................................................................................................................................21
2.4 Connecting the Power Cable ............................................................................................................................21
2.5 Applying Power (Turning the Power Switch ON) ..............................................................................................21-22
2.6 Calibration Gas Secondary Pressure Adjustment ............................................................................................23-24
2.7 Calibration .........................................................................................................................................................24
2.8 Adjusting the Speaker Tone Volume ................................................................................................................25
2.9 Allowing Air to Flow at the End of Preparation .................................................................................................25
3. Calibration ...............................................................................................................................26-32
3.1 Auto Calibration.................................................................................................................................................28
3.1.1 Setting the switches...............................................................................................................................28
3.1.2 Operator actions and the calibration operation .....................................................................................28-29
3.1.3 What to do if the “CAL FAIL” indicator appears.....................................................................................30
3.2 Manual Calibration ............................................................................................................................................31
3.2.1 Setting the switches...............................................................................................................................31
3.2.2 Operator actions and calibration operation ...........................................................................................31
3.2.3 What to do if the CAL FAIL appears......................................................................................................31
3.2.4 What to do if the alarm code appears ...................................................................................................32
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4. Measurement Operations .......................................................................................................33-42
4.1 Choosing a Location for the H-25C, and Getting Ready to Start Measurement ..............................................33
4.1.1 Choosing a location ...............................................................................................................................33
4.1.2 Getting ready for measurement.............................................................................................................33-35
4.2 Measurement ....................................................................................................................................................36
4.2.1 Measurement modes.............................................................................................................................36
4.2.2 Searching for the location of a leak in B-type mode..............................................................................36
4.2.3 Searching for the location of a leak in A-type mode.............................................................................36-38
4.2.4 Leak Rate Measurement in B-type mode..............................................................................................39
4.2.5 Leak Rate Measurement in A-type mode..............................................................................................39
4.2.6 How to Check the Measured Value, and Possible Reasons for Abnormal Operation..........................40-41
4.2.7 Turn the Power Switch OFF ..................................................................................................................41
4.3 R-12 Leak Detection .........................................................................................................................................42
4.3.1 Switch Setting ........................................................................................................................................42
4.3.2 Calibration Procedures ..........................................................................................................................42
5. Maintenance ............................................................................................................................43-48
5.1 Replacing the Probe Filter ................................................................................................................................43
5.2 Replacing the Activated Charcoal Filter............................................................................................................44-45
5.3 Refilling the Tank with Freon ............................................................................................................................46-47
5.4 Replacing the Sensor........................................................................................................................................47-48
5.5 Replacing the Disc Filter ...................................................................................................................................48
5.6 Replacing the Fuse ...........................................................................................................................................48
6. Troubleshooting......................................................................................................................49-52
6.1 Improper Use Leading to Hardware Failure......................................................................................................49
6.1.1 Never connect 240 V power when the supply voltage selector switch is set to a 100 V range ............ 49
6.1.2 Never allow liquid to be sucked in .........................................................................................................49
6.2 Possible Causes of Malfunctions, and What to do If They Occur.....................................................................50
6.2.1 Does not operate at all ..........................................................................................................................50
6.2.2 Does not detect leaks ............................................................................................................................50
6.2.3 Measured value is too low .....................................................................................................................50-51
6.2.4 Measured value is too high....................................................................................................................51
6.2.5 “AIR FLOW” on steady ..........................................................................................................................51
6.2.6 Frequent calibration requests ................................................................................................................51
6.2.7 Very short sensor life .............................................................................................................................51
6.2.8 “CAL FAIL” on steady ............................................................................................................................ 51-52
6.2.9 Liquid R134a in tank used up too quickly..............................................................................................52
6.2.10 Will not calibrate to proper value ........................................................................................................... 52
[Reference] Facilities for ridding the Atmosphere of Unwanted Gases Where Leakage
Inspections Are Made..................................................................................................................53-54
Customer Maintenance Parts List ..............................................................................................55-56
Sales / Service Centers ...............................................................................................................57
Notice:
Product improvements and enhancements are continuous; therefore the specifications and information contained in this document may change without
notice. Bacharach, Inc. shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing,
performance, or use of this material. No part of this document may be photocopied, reproduced, or translated to another language without the prior
written consent of Bacharach, Inc.
Copyright © 2000–2002, Bacharach, Inc., all rights reserved. Revision Date 04/04/2003.
BACHARACH® is a registered trademark of Bacharach, Inc. All other trademarks, trade names, service marks and logos referenced herein belong to
their respective owners.
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H-25C Instruction Manual
INTRODUCTION
1. H-25C Halogen Leak Detector Applications
2. Unpacking and Initial Checks
3. Warranty
4. Procuring and Storing Frequently Replaced Maintenance Items
5. Operating Precautions
6. Preparing for Use
7. Special Symbols and Formatting Used in this Manual
1. H-25C Halogen Leak Detector Applications
Coolant leaks adversely affect the performance of refrigeration and air conditioning equipment. Leak detection
is therefore one of the most important items of a quality inspection.
The H-25C Halogen Leak Detector is an instrument that will detect leaks of freon gases such as HFC 134a
and CFC 12, which are used as coolants in electric refrigerators, commercial freezers, and automotive air
conditioners.
This instrument is particularly suited for leak detection in manufacturing inspection processes.
Remarks: HFC - 134a; Hydrofluorocarbon (R - 134a)
CFC - 12; Chlorofluorocarbon (R - 12)
Note: In this manual these will be hereafter written as R - 134a and R - 12.
2. Unpacking and Initial Checks
Your H-25C Halogen Leak Detector was carefully inspected at the factory before shipment, and
packed so as to be highly resistant to damage while in transport. However, when you receive the
unit, please unpack it promptly and make a visual inspection to make sure that no damage has
occurred during shipment. Please also verify that the specifications of the instrument that you have
received match your order. To check the specifications, examine the model code information on the
nameplate at the rear of the instrument (see page 1 - 4 for the meanings of the codes).
Note that the H-25C Halogen Leak Detector comes with the following accessories.
Please check also that all of these items are present.
Item Name Quantity Remarks
Power cable 1 Length: 3 m, with grounding plug
Probe 1 As per type of probe ordered
Spare filter (for S-type probe)
Spare filter and o-ring (for L-type probe)
Spare activated-charcoal pack 1 For activated – charcoal pack
Sensor 1
Power switch ON/OFF key 2
Spare fuse 1 Stored inside power cable connector
1 set
(see Section 5.6)
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3. Warranty
Failures occurring within one year of the purchase date will be repaired free of charge if the problem
is determined to clearly be the responsibility of BACHARACH.
Note this warranty does not apply to the sensor and filters (probe filter, activated charcoal filter).
4. Procuring and Storing Frequently Replaced Maintenance Items
You will need to procure certain maintenance items (see page 1 - 4) on a regular basis.
We strongly recommend that you keep a stock of sensors and filters on hand at all times.
Note that the sensor will deteriorate even while in storage if exposed to humidity.
Always store the sensor in the sealed condition in which you received it.
5. Operating Precautions
5.1 Precautions Regarding High-Temperature Parts and High-Voltage Circuits
Parts of
Be very careful not to touch these parts, as burns or electric shock will result.
the H-25C operate at high temperatures and voltages.
Always take precautions to discharge static electricity from your body before touching the ROM
or associated circuits.
Exposing the ROM on the printed circuit board to strong static electric charges may cause
malfunction. Be very careful when the air is dry and static electricity is easily generated.
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5.2 Avoiding Problems
• Please strictly observe the following:
Always power the H-25C from the proper AC line voltage for its specification. Always set the supply
voltage selector switch to the proper position for the voltage in use.
Transformer damage will result if you mistakenly connect a 100 V range instrument to a 200 V range
power source.
• Do not let the probe absorb liquid or highly concentrated halogen gas. Doing so will shorten the life
of the sensor and the activated charcoal filter, and may cause malfunction.
To keep dust and other foreign matter from being sucked into the instrument, always attach a probe
when operating the instrument.
• Use the H-25C only indoors or in an equivalent environment.
When storing the H-25C, select a location where it will not be exposed to corrosive gases or high
humidity.
To obtain the best leak detection performance, keep the following in mind:
• Ventilate the work area well so that contaminants cannot accumulate in the air.
• The surface on which you place the H-25C should be nearly horizontal, and should not vibrate.
6. Preparing for Use
Before using the H-25C, you must set various switches according to the detection conditions (gas to be detected,
detection sensitivity, etc.), and make various adjustments (calibration gas secondary pressure, calibration request
interval, etc.) in order to obtain proper operation.
The text that follows shows the basic procedures for preparing to use the H-25C, and the measurement and
calibration procedures. For details, see Sections 2 through 4 of this manual. Note that this manual explains both
how to operate and how to maintain the H 25C. Also, in case of malfunction, this manual explains how to make
those repairs which can be made by a user. You should be sure to read this entire manual once before using the
instrument.
Note: This manual applies to instruments manufactured after September '94.
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H-25C Instruction Manual
The parts in instruments manufactured before September '94 are different.
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Preparing for Use & Measurement and Calibration
Preparing for Use
Operation Remarks
1. Install the sensor
2. Set the switches
• Supply voltage selector switch
• Type-of-gas selector switch
• Measuring units selector switch
(1) Measurement unit selection
(2) Contact status selection at alarm output
(3) Measurement mode ( A-type / B-type selection
• Alarm point setting switches
• Cal. Mode (auto / manual) selector switch
• Cal. Request interval setting switch
• Search mode sensitivity switch
3. Connect the probe
4. Connect the power cable
5. Apply power (turn power switch ON)
6. Adjust cal gas secondary pressure (within 3 minutes after
power-ON)
7. Calibrate (at least 30 minutes after cal gas secondary
pressure adjustment)
8. Adjust speaker tone volume
9. Allow suction of air (Power OFF)
(See Section 2.1)
(See Subsection 2.2.1)
(See Subsection 2.2.2)
(See Subsection 2.2.3)
(See Subsection 2.2.4)
(See Subsection 2.2.5)
(See Subsection 2.2.6)
(See Subsection 2.2.7)
(See Subsection 2.2.8)
(See Subsection 2.2.9)
(See Section 2.3)
(See Section 2.4)
(See Section 2.5)
(See Section 2.6)
(See Chapter 3)
(See Section 2.8)
(See Section 2.9)
Measurement and Calibration
Operator action Data Display Bar Graph Display Speaker Tone
1. Apply power (turn
power switch ON)
Warm-up (180
seconds)
Ready for
measurement (search
mode)
2. Leak detection
Leak location search :
Search mode
(probe switch OFF : not
pressed)
Leak flow measurement
: Pass/fail
Mode (probe switch ON
: depressed)
3. Calibration (auto)
Insert probe into “CAL
PORT”
Pull probe out when
count reaches 0. (let
suck air)
Wait for sensor output
to stabilize.
Ready for
measurement (search
mode)
Note: The above table- shows the basic procedures for preparing to use the H-25C with auto calibration, and the measurement and calibration.
*1 : Check how measurements are made with the measurement mode set to A-type. Note that B-type mode is generally used for detecting leaks.
.(Displays all)
.“H25”
.Version No.
.“180” – “0”
(Countdown)
Measured value (lit)
.Measured value (lit)
.Measured value (flashing
.”CAL” (3 seconds)
.”7” – “0”
(countdown)
.”…”
.Measured value (lit)
)
.Pressure
kPa {kgf/cm
100% : 100 {1.0}
200% : 200{2.0}
.(% value)
.Search mode alarm Percent of
point (auto-zero operates at
20% or below)
.Percentage of alarm point
.Pressure
.Sensor sensitivity
.(% value)
2
}
Factory setting: R134a
Factory setting: Std. ml/s
Applies if equipped with contact
output
Factory setting: A-type mode
Factory setting: 4 hours
Factory setting: 5 times
Begin warm-up
.Continuous tone upon detection
.Continuous tone upon detection
(10% or higher)
.Intermittent tone upon detection
(100% or higher)
.
7 to 4 : Continuous tone
3, 2, 1 : Short tone
0 : Continuous tone
(*1)
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H-25C Instruction Manual
7. Special Symbols and Formatting Used in This Manual
• The Display State (Lit or Flashing) is Indicated in Figures as follows:
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H-25C Instruction Manual
1. NAMES AND FUNCTIONS OF COMPONENTS
(Model codes, specifications, gases measured, calibration gas flow)
1.1 Setup Area Details
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H-25C Instruction Manual
1.2 Model Codes
MODEL SUFFIX CODES DESCRIPTION
H-25C
Auto CAL
function
Contact Output -N
Supply voltage -5
Analog output -N
Instruction Manual -E
Probe -P0
-N
-1
-1
-6
-7
-1
-J
-P1
-P2
-P3
-P4
-P5
-P6
No (calibrate manually with external gas
source
Yes (both auto and manual calibration
possible)
No Relay
Yes Dry Contact Relay Output
100/115 V, 50/60 Hz
120/240 V, 50/60 Hz
110/220 V, 50/60 Hz
No
Yes 0-1V DC Analog Output
English Language
Japanese Language
6 ft. mini-probe
15 ft. mini-probe
6 ft. probe
15 ft. probe (Standard)
25 ft. probe
Type L, (6 ft.) H25B tip
Type L, (15 ft.) H25B tip
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H-25C Instruction Manual
1.3 SPECIFICATIONS
Specifications
Gas Measured:
Sensor:
Measurement Range:
Alarm Point Setting Range:
Measurement Modes:
Measurement Units:
Response Time:
Calibration:
Output Signal:
Contact Output:
Displays:
Audio Speaker:
Supply Voltage;
Power Consumption:
Dimensions:
Weight:
R134a or R12 gas
Cationic emission type sensor
-5
9x10
Note: One std. ml/s: Flow volume per second, converted to equivalent gas at 0° C 1 atm.
-6
9x10
B-type measurement mode (for detecting leaks in a normal atmosphere
A-type measurement mode (for detecting leaks in a clean atmosphere)
Either “x10
Approx. 1 second
Auto calibration (function supplied as option if specified)
Manual calibration (using “LS20B Leak Standard”)
0 to 1V DC, output resistance 1Ω max. (function supplied as option if specified
One “Alarm” point (output generated when measurement exceeds alarm setting) (function supplied as an option if
specified)
Data display (3 digit numeric display)
Bar graph indicator (0 to 200% in 20 segments)
Malfunction alarm display
Type of gas display
Unit
Probe indicator (LED)
Indicates leak detection, cal request, cal operation in progress
Leak detection, cal request, cal operation in progress
100/115V AC, 50/60 Hz, 110/220 V AC, 50/60 Hz, or 120/240 V AC, 50/60 Hz
100VA
148 H x 210 W x 330 D mm, (5-13/16 H x 8¼ W x 13D in)
Approx. 10 kg (22lbs)
-4
to 9x10
to 9x10-4 std. ml/s, 1.4 to 99 g/y, 0.05 to 5.0 oz/y
Auto zero mode: (for searching for leaks)
Auto zero hold mode: (for measuring leak flow)
Search mode: (for searching for the location of leaks)
Pass/fail mode: (for measuring leak flow)
Relay state: Either an energized or de-energized state can be selected when the output is sent out.
Contact States: NO or NC, selectable
Contact rating: 2A (250 V AC, 30V DC)
Measured value, warm-up time countdown, cal request, idling operation, ect.
Measured value, cal gas pressure – if equipped with auto cal function (indicated during warm-up and during
calibration), sensor sensitivity (at cal completion), etc.
“AIR FLOW” (measured gas intake flow), “CAL FAIL” (EE Prom failure, calibration gas pressure low, unable to
calibrate)
std. ml/s, 1.5 to 150 g/yearly, 0.05 to 5.0 oz/yearly)
-5
std. ml/s” (x10-5 std. ml/s) or “g/y” can be selected
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1.4 Probes
1.5 Accessories and Maintenance Tool List
Item Name Part Number Remarks
Filter (For S-type probe)
Filter, O-ring (for L-type probe)
Activated – Charcoal pack
Sensor
Fuse (rating: 3.15A 250V
Disc Filter
Freon filler fitting
3015-1820
3015-1705
3015-2418
3015-0807
3015-1630
3015-2476
3015-1433
Unit of purchase : 1 piece
Unit of purchase : 1 set (one piece each)
Unit of purchase : 1 set (five pieces)
Unit of purchase : 1 piece
Unit of purchase : 2 pieces
Unit of purchase : 1 piece
Used when filling tank with liquid freon for use in
calibration
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1.6 Internal Flow Paths
• Measured Gas Internal Flow Path
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2. PREPARING FOR USE
This section explains the switch settings and other procedures that must be done to prepare the instrument for
use. For operating instructions, see Section 4.
2.1 Installing the Sensor
Note: The sensor may deteriorate during storage due to the effects of water vapor in the air. Therefore, the
instrument is shipped with the sensor removed and sealed in a humidity-excluding bag.
Install the sensor as follows:
(1) Remove the sensor changer cover.
(2) Remove the protective cap attached to the sensor mounting socket.
(3) Insert the sensor pins into the holes in the socket.
(4) Push the tubing connector securely onto the top of the installed sensor.
(5) Re-attach the sensor chamber cover.
Note: The sensor surface temperature reaches about 200°C (392°F) during operation. Always keep
the sensor chamber cover in place so as to prevent fires and other accidents.
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2.2 Setting the Switches
2.2.1 Setting the Supply Voltage Selector Switch
Note: The H-25C comes with three different supply voltage specifications, 100/115 VAC, 100/200 VAC,
Or 120/240 VAC. The frequency can be either 50 or 60 Hz. Use the supply voltage selector switch
on the rear of the H-25C to select 100 and 115 V, 110 and 220 V, or 120 and 240V.
Set the supply voltage selector switch to the side labeled appropriate to the AC line voltage you
intend to use.
The H-25C Halogen Leak Detector will operate properly o AC power of voltage matching the
instrument specifications.
2.2.2 Setting the “GAS” (type of gas) Switch
Note: The “GAS” switch is at the right of the setup area on the main unit front. Open the setup area
cover to gain access to it.
Set the “GAS” switch lever to the “R134a” position if using the instrument for R134a leak detection, or
to the “R12” position if using the instrument for R12 leak detection.
Note: Can also be used to detect leaks of certain freons (R22) and freon substitutes (R502) in
addition to R12. If using the instrument to detect leaks of these substances, set the switch to the R12
position.
2.2.3 Setting the “UNIT” (unit selector) Switches
The measurement units to be used are set with the “UNIT” switches (1,2). Set the switches as
follows.
The unit that can be registered is either “X 10-5 std. ml/s” or “g/y”.
Note that the units for leak flow are to be selected from among “X10-5 std. ml/s”, “g/y”, and “oz/y”
Note: The selected units are indicated in the display area during measurement.
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2.2.4 Setting the “RELAY” (Relay State Selector) Switch
Note: The “RELAY” switch (3) must be set if the instrument is equipped with the alarm contact signal
output function.
The alarm contact signal is output when the leak flow is greater than or equal to the alarm setting.
The “RELAY” switch selects whether the relay is to be energized or de-energized at the time.
Since the relay contact is set up at the factory as a normally open (N)) contact, selecting “energize”
will result in the contacts closing when the signal is output, whereas selecting “de-energize” will result
in the contacts opening.
It is also possible to change the relay connections to use the normally closed (NC) contact (by
changing the position of jumper JP1 on the printed circuit board inside the unit).
If you change to the NC contact, then the contacts will be in the closed state when power is OFF. If
you have changed to the NC contact, then to have the contacts go to the closed state at time of alarm
you must set the switch lever to the “de-energize” position.
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2.2.5 Setting the “MODE” (Measurement Mode Selector) Switch
Select the measurement mode using the MODE (measurement mode selector) switch.
There are two measurement modes, A-type and B-type. For detecting leaks in a normal atmosphere,
set the switch to B-type. (The factory setting is A-type mode.) Select A-type mode if the atmosphere
at the measurement site is always clean (extremely small quantity of unwanted gas). For details, see
Subsection 4.2.2
Note: When first using this switch, select A-type mode and check it is working.
2.2.6 Setting the Alarm Point
Note: Alarms (intermittent tone from the speaker, flashing indicator lamp) are output when the
measured value is greater than or equal to 100% on the bar graph. The value at which the alarm
output trips is called the alarm output trips is called the alarm point. Although this point can be freely
set by the user, there are restrictions on the lower limit. Also, when A-type measurement mode is
selected, the search mode sensitivity is restricted depending on the value set (see Subsection 2.2.9).
Generally, set the alarm point used to detect leaks to the highest possible value of leakage.
The alarm point value is set using the “ALARM” switches. The “ALARM” switches consist of three
digital switches. The two on the left set a 2-digit number, and the “EXPNT” switch on the right sets
the exponent.
Note that if the instrument is equipped with the alarm contact output function, then the contact signal
will also be output at alarm output time. The alarm annunciation and contact signal will remain on
until the measurement value drops to 20% below the alarm point. (That is, a hysteresis band of
20%.)
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