Center 384 User manual

384
Hydrogen (H2) Gas Leak Detector

CONTENT Page
1. GENERAL INFORMATION ------------------ 2
2. FEATURES
---------------------------------------- 3
3. SPECIFICATION
---------------------------------4
4. OPERATION GUIDE --------------------------- 5
5. PART & CONTROL------------------------------ 6
6. GETTING STARTED---------------------------- 8
6-1 Installing Batteries----------------------------8
6-2 Automatic Circuit/Reset Feature---------9
6-3 Feature Sensitivity Adjustment--------- 11
7. OPERATING PROCEDURE--------------- 12
8. REPLACING NEW SENSOR-------------- 14
9. CLEANING
--------------------------------------- 16

Hydrogen (H2) Gas Leak Detector
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1. GENERAL INFORMATION
Thank you for purchasing Hydrogen (H2) Leakage
Detector. Read though the instruction manual before
operation for correct and safe usage. Please store
and retain this instruction manual for future reference.
1.1 SAFETY USE AND WORKING
ENVIRONMENT
Hydrogen (H2) Leakage Detector only is used by
persons who have necessary knowledge, skill and
know-how for Hydrogen Leakage.
It is designed to detect the leakage for a mixture
consisting of 95% nitrogen and 5% hydrogen.
Please keep the working environment in the moving
fresh air. Don’t work the detector in the confined space
or in closed room.
1.2 HYDROGEN INFORMATION
Hydrogen is the lightest element. Therefore, it
spreads and volatilizes very quickly. At standard
temperature and pressure, hydrogen is a colorless,
odorless, tasteless, non-toxic, nonmetallic.
But over 5% Hydrogen is highly combustible and
explosive. The lower explosion limit for 100%
Hydrogen is < 4% and for Forming Gas (a mixture of
hydrogen and nitrogen) is 5.6% at room temperature.
A mixture consisting of 95% nitrogen and 5%
hydrogen is not inflammable (see ISO 10156), non

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3
toxic and with on environmental issues. And when it
exposes to the ambient air, it quickly rises.
2. FEATURES
This Hydrogen (H2) Leakage Detector can quickly
detect the hydrogen leakage. And its sensitivity is
less than 5 ppm.
A new Forming Gas mixture 5% Hydrogen (H2)+
95% Nitrogen(N) is used in the refrigerant or
air-conditioning systems. Therefore, a good leakage
detector can help the maintenance service to trace
the leakage and improve the cooling efficiency.
Microprocessor Control with advanced digital
signal processing.
Multi color visual display.
High-median-Low leak sensitivity selector.
Low battery indication.
Semiconductor gas sensor.
Detection of mixture 5% Hydrogen (H2) + 95%
Nitrogen(N).
Carrying case included.
15.5” (40 CM) flexible stainless probe.
Ambient concentration reset.
Long-life, DC brushless fan.
Automatic zero and background compensation.


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3. SPECIFICATION
Detectable Gases:
mixture 5% Hydrogen (H2) + 95% Nitrogen(N).
Sensitivity:
Less than 5 ppm
H M L
95%N2,5%H2 2g/year 15g/year 30g/year
Alarm Method:
Buzzer, Tricolor LED bar Indicator.
Power Usage:
4 AA size (6V DC) Alkaline Batteries
Snake Tube length: 40cm ( 15.5” )
Dimension / Weight:
173 x 66 x 56 mm ( approximately 400g )
Accessories:
Alkaline batteries ( AA) X 4 pcs
User manual, carry case.
Battery Life:
Approximately 7 hours normal use.
Auto power OFF: 10 minutes
Disable Auto Power Off:
Press and Hold “Hi” button then power on the meter.
Warm-Up Time: Approximately 45 seconds
Operating Temperature & Humidity:
0 ~40 °C, < 80% RH

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Storage Temperature & Humidity:
-10 ~60 °C, < 70% RH
Altitude: < 2000M (6500’)
4. OPERATION GUIDE
(1) The Hydrogen detector unit is not equipped with
anti-explosive designs and measures. Do not use
this unit in the environment with the burnable
gases.
(2) There are some environmental conditions that
might cause error reading:
Pollutant places.
Large temperature variation.
Places with high wind velocity.
Organic solvent, adhesive vapor, fuel gas and
vesicant will cause abnormal response from the
sensor. Try to avoid the environment involved with
this substance.
Places fill with too much to Hydrogen Gas.

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5. PARTS & CONTROL
5-1 Panel Description

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○
1Sensor ○ 2Sensor Protector
○
3LED Leak Indicators ○ 4Sensitivity Lo Button
○
5Sensitivity Hi Button ○ 6Reset Button
○
7Low Battery Indicator
○
8Power On/Off
○
9Battery Cover ○ 10 Battery Cover Screw
5-2 LED Leak Indicator Definition:

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6. GETTING STARTED
6-1 Installing Batteries
Loose the screw and remove the battery
compartment door located on the bottom of the
instrument as show below (Fig.1).
Install 4 “AA” size alkaline batteries.
Reinstall the battery cover by aligning it with the
handle.
When the batteries are nearing the end of their useful
life, the Red LED Low Battery indicator illuminates. The
batteries should be replaced as quickly as possible.
4 “AA” size
alkaline batteries
Fig.1

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6-2 Automatic Ambient Reset Feature
This Hydrogen leak detector features an Automatic
Ambient Reset function that sets the unit to ignore
ambient concentrations of hydrogen.
Automatic Ambient Setup - Upon initial power on,
the unit automatically sets itself to ignore the level
of Hydrogen present at the tip. Only a level, or
concentration, greater than this will cause an alarm.
CAUTION!
Be aware that this feature will cause the unit to
ignore any hydrogen present at turn on. In other
words, with the unit off if you place the tip up to a
known leak and switch the unit on, no leak will be
indicated!
Ambient Reset Feature - Resetting the unit during
operation performs a similar function, it programs
the circuit to ignore the level of hydrogen
concentration present at the tip. This allows the
user to 'home-in' on the source of the leak (higher
concentration). Similarly, the unit can be moved to
fresh air and reset for maximum sensitivity.
Resetting the unit with no Hydrogen present (fresh
air) causes any level above zero to be detected.
After the unit is warmed up, the default sensitivity
level is set at “Medium” and Auto Reset function is
“ON”
Auto Reset function is best used initially when user

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is moving around trying to identify leakage source.
Once the leak source is determined, cancel the
Auto Detect function to proceed with leakage
measurement.
Auto Reset function should be turned OFF when
use in fixed position leakage detection.

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6-3 Feature Sensitivity Adjustment
The Instrument provides three levels of sensitivity.
When the unit is switched on, it is set to the medium
sensitivity level.
To change the sensitivity, press the key.
When the key is pressed, the visual display will
momentarily show the two left LED's (green)
indicating Low Sensitivity level is selected.
To switch back to High Sensitivity, press the
key. The two right LED's (red) will light momentarily
indicating high Sensitivity level is selected.
Low Sensitivity level
(Green LED)
Medium Sensitivity level
(Orange LED)
High Sensitivity level
(Red LED)

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7. OPERATING PROCEDURE
WARNING!
Do not operate this instrument in the
presence of gasoline, natural gas, propane,
or in other combustible atmospheres.
How To Find Leaks?
NOTE: A sudden whipping of the leak detector probe
or "blowing" into the sensor tip will affect the air flow
over the sensor and cause the instrument to alarm.
(1) Power-Up key:
The key turns the Hydrogen Leak Detector
instrument ON or OFF function.
Press it once to turn on the Hydrogen Leak Detector,
the display will illuminate with flash, for 45 seconds to
heat up the sensor.
Press and hold this button for 5 second to turn OFF the
power.
(2) Auto reset & Reset function key
When the Auto Reset function is turned ON, the meter
will monitor background status and fine tune itself.
When Reset LED light is on, it indicates it is in ON
mode. Press Reset button and hold for 2 seconds the
Reset light will turn off and Auto Reset function is in
OFF mode.

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When the Reset light is off, it indicates the Reset
function is in manual mode. Press the Reset button
once to enable manual Reset function.
(3) Enter the measuring mode
Place the tip of the leak-detector probe as close as
possible to the site of the suspected leak. Try to
position the probe within 1/4 inch (6 mm) of the
possible leak source.
Slowly move the probe past each possible leakage
point.
When the instrument detects a leak source, the
audible tone will alarm. Additionally, the visual
indicators will light from left to right, Green LED
then Orange LED then Red LED (highest
concentration) as increasing of level indicate that
the location is close to the source.
When the Instrument signals a leakage, pull the
probe away from the leak for a moment, and then
bring it back to pinpoint the location. If the hydrogen
leak is large, setting the sensitivity switch to LOW
will make it easier to find the exact site of the leak.
Return the sensitivity switch to HIGH before
searching for additional leaks.
When you've finished leak-testing, turn OFF the
instrument and store it in a clean place, protect the
leak detector from possible damage.

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Sensor
Sensor protector
8. REPLACING NEW SENSOR
The sensor has a limited operative period. Under
normal operation, the sensor should work more than
one year. Expose the sensor under high density of
coolant (>30000ppm) will shorten its life cycle rapidly. It
is important to ensure that sensor surface is free from
water droplets, vapor, oil, grease, dust and any or all
other forms of contaminant. Furthermore, to ensure
good working condition of the unit, sensors must be
replacement periodically when its operative life is over.
WARNING! When replacing new sensor,
the worn-out sensor may be HOT!!
(1) Remove cone cap cover from the tip of snake tube.
(2) Pull out old sensor and insert the new sensor into
the plug ( see below fig.2).
(3) Seal the cap cover over the plug.
Fig.2

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9. CLEANING:
The Instrument plastic housing can be cleaned with
standard household detergent or isopropyl alcohol.
Care should be taken to prevent the cleaner from
entering the instrument. Gasoline and other solvents
may damage the plastic and should be avoided.
WARNING!
The detergent or isopropyl alcohol might
damage the sensor, please keep then from
the sensor through the process.

CENTER TECHNOLOGY CORP.
4F, NO.415, Jung-Jeng Rd., Shu-Lin Dist.,
New Taipei City 238, Taiwan
TEL : [phone] E-Mail : [email protected]
FAX : [phone] http : / / www.centertek.com
GCA000384-22000