NGD8800
USER’S MANUAL
COMBUSTIBLE GAS
DETECTOR
Please read this manual carefully and thoroughly before using this product.
CONTENT Page
1. GENERAL INFORMATION ------------------ 2
2. FEATURES
3. SPECIFICATIONS
4. OPERATION GUIDE
5. PARTS & CONTROLS
6. GETTING STARTED
6-1 Installing Batteries ------------------------- 7
6-2 Automatic Circuit/Reset Feature ------
6-3 Feature Sensitivity Adjustment --------
7. OPERATING PROCEDURES
8. REPLACING NEW SENSOR
9. CLEANING
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COMBUSTIBLE GAS DETECTOR
1. GENERAL INFORMATION
Thank you for purchasing this Combustible Gas
Detector. Read though the instruction manual before
operation for correct and safe usage. Please store and
retain this instruction manual for future reference.
2. FEATURES
This Combustible Gas Detector is extremely useful as a
general purpose tool in any environment where
propane, methane, natural gas, gasoline and fuel oil is
used. This unit uses a newly developed semi-conductor
sensor which is extremely sensitive to variety of general
use combustible gases.
Microprocessor controlled with advanced digital
signal processing
Multi color visual display
High-Low leak sensitivity selector
Low battery indication
Semiconductor gas sensor
Detection of combustible gas
Carrying case included
15.5 in. (400mm) flexible stainless probe
Reference Leak source included
Ambient concentration reset
Application:
Detect leaks in automobile exhaust and fuel system
Detect leaks in liquid or gas fired heating systems
Safety checks at propane filling stations
Search for arson residue (detects accelerants)
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COMBUSTIBLE GAS DETECTOR
Detect fuel in marine bilges
Check manholes/sewers for safety
Check for cracked heat exchangers
Detect solvent residue
3. SPECIFICATIONS
Detectable Gases:
Propane, methane, natural gas, gasoline, fuel oil,
CH4 (methane), H2 (hydrogen), Iso-butane, Ethanol,
Ethylene, Tetrachloroethylene, Dimethyl sulfide,
Toluene, Folmaldehyde, Dietyl-ether, Ethyl-acetate,
Dochloromethane, NH3 (ammonia), R-22
Alarm Method:
Buzzer, Tricolor LED bar Indicator
Sensitivity: As low as 5ppm (methane)
Power Source:
4 “AA” (6V DC) alkaline batteries
Probe Length: 15.5 in. (400mm)
Dimension / Weight:
6.8 x 2.6 x 2.2 in. (173 x 66 x 56mm) / approximately
14.1 oz. (400g)
Accessories:
4 “AA” alkaline batteries, user’s manual, leak check
bottle, carry case
Battery Life:
Approximately 40 hours normal use
Auto power OFF: 10 minutes
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COMBUSTIBLE GAS DETECTOR
Warm-Up Time: Approximately 90 seconds
Operating Temperature & Humidity:
32° to 104°F (0° to 40°C), < 80% RH
Storage Temperature & Humidity:
14° to 140°F (-10° to 60°C), < 70% RH
Altitude: <6500 ft. (2000m)
4. OPERATION GUIDE
(1) This combustible gas detector unit is NOT designed
for anti-explosive measures. Do not use this unit in an
area where combustible gases can be found.
(2) The following environmental conditions may cause
error in the readings:
Large temperature variations
High wind velocity
Organic solvents, adhesive vapors, fuel gas and
vesicants. Try to avoid environments filled with
these substances.
Places filled with too much combustible gas
Note: Although this unit will respond to high levels of
carbon monoxide, it should NOT be used as a detector
for this gas in normal room or working atmospheres. It
is used to pinpoint a leak as described in the operating
instruction.
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5. PARTS & CONTROLS
COMBUSTIBLE GAS DETECTOR
5-1 Panel Description
COMBUSTIBLE
GAS DETECTOR
○9
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COMBUSTIBLE GAS DETECTOR
1. Sensor 2. Sensor Protector
3. LED Leak Indicators 4. Sensitivity Lo Button
5. Sensitivity Hi Button 6. Low Battery Indicator
7. Power On/Off & Reset Button
8. Battery Cover 9. Battery Cover Screw
5-2 LED Leak Indicator Definition:
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COMBUSTIBLE GAS DETECTOR
6. GETTING STARTED
6-1 Installing Batteries
Loosen the screw and remove the battery
compartment door located on the bottom of the
instrument as shown below (Fig.1)
Install 4 “AA” size alkaline batteries
Reinstall the battery cover by aligning it with the
handle
When the battery power is running low, the Red LED Low
Battery indicator illuminates. The batteries should be then
replaced as quickly as possible.
4 “AA” size
alkaline batteries
Fig.1
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COMBUSTIBLE GAS DETECTOR
6-2 Automatic Ambient Reset Feature
This combustible gas detector features an Automatic
Ambient Reset function that sets the unit to ignore
ambient concentrations of combustible gas.
Automatic Ambient Setup - Upon initial power on,
the unit automatically sets itself (approx. 1.5 minutes)
to ignore the level of combustible gases present at
the tip. Only a level, or concentration, greater than
this will cause an alarm.
CAUTION!
This feature will cause the unit to ignore any
combustible gases present at power 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 combustible gases
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
combustible gas present (fresh air) causes any level
above zero to be detected.
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COMBUSTIBLE GAS DETECTOR
6-3 Feature Sensitivity Adjustment
The Instrument provides two levels of sensitivity. When
the unit is switched on, it is set to the high sensitivity level
by default.
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.
7. OPERATING PROCEDURES
WARNI NG!
1. Do not use the instrument in an area of
extremely high level of combustible gas.
2. The gas/vapor of organic solvent might
interfere with the function of the unit. During
detection, please eliminate the influence of the
organic solvent.
3. In order to ensure correct operation and
indication, the unit should be switched on and
warm-up in non-contaminated atmosphere.
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COMBUSTIBLE GAS DETECTOR
z 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 & Reset function key:
The key turns the combustible leak detector
instrument ON or OFF and is also the reset function.
Press it once to turn on the combustible leak detector.
The display will illuminate with flash, for 1.5 minutes to
heat up the sensor.
Press it again to reset the ambient base concentration.
Press and hold this button for 5 seconds to turn OFF the
power.
(2) Verify the condition of the unit and sensor:
Monthly testing of unit is recommended using the
included reference leak source or when even it is
suspected that the reading is not correct.
Set the sensitivity level to “Hi”.
Open the leak check bottle cover and slowly move it
closer to sensor.
If the indication moves up to high from low then you
should move the check bottle away and the LED
should go off again. This shows that the unit is under
working condition.
If the unit does not perform as expected, bring the
unit for maintenance at your local sales office.
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COMBUSTIBLE GAS DETECTOR
(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 (6mm) of the
possible leak source.
Losing sensitivity gradually. Using the reference leak
source to check: normally (new sensor), with the
sensitivity set to high, when you move the check
bottle to the sensor, the detector responds very fast
(immediately detects the gas with full LED lights on
and continuous beep).
Older sensors: over time, sensor sensitivity drops
and detection response time increases, whereby a
newer sensor would activate the red LED, as
opposed to an older sensor indicating a green LED.
Slowly move the probe past each possible leakage
point.
When the instrument detects a leak source, the
audible alarm will sound. Additionally, the visual
indicators will light from left to right; Green LED, then
Orange LED, then Red LED (highest concentration).
Increasing LED levels indicate the growing proximity
to the leak 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 combustible leak is
large, setting the sensitivity switch to LOW will make it
easier to find the exact site of the leak.
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COMBUSTIBLE GAS DETECTOR
Return the sensitivity switch to HIGH before
searching for additional leaks.
When finished leak testing, turn OFF the instrument
and store it in a clean place. Protect the leak detector
from possible damage.
8. REPLACING NEW SENSOR
The sensor has a limited operative period. Under normal
operation, the sensor should be replaced once a year.
Exposing the sensor to high concentration of coolant
(>30000ppm) will shorten its life cycle rapidly. It is
important to make sure that sensor surface is free from
water droplets, vapor, oil, grease, dust and all other forms
of contaminants. For proper operation, the sensors must
be replaced annually or when contaminated.
WARNI NG! When replacing sensor, the
worn-out sensor may be HOT!!
(1) Remove cone cap cover from the tip of the probe.
(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.
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COMBUSTIBLE GAS DETECTOR
Sensor protector
Sensor
Fig.2
9. CLEANING
The Instrument plastic housing can be cleaned with
standard household detergent or isopropyl alcohol. Care
should be taken to prevent the cleaning fluid from
entering the instrument. Gasoline and other solvents may
damage the plastic and should be avoided.
WARNI NG!
Detergent or isopropyl alcohol may damage
the sensor, please keep them away from the
sensor during the cleaning process.
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GENERAL TOOLS & INSTRUMENTS
80 White Street
New York, NY 10013-3567
PHONE (212) 431-6100
FAX ( 212 ) 431 -6499
TOLL FREE (800) 697-8665
e-mail: sales@generaltools.com
www.generaltools.com
NGD8800 User’s Manual
Specifications subject to change without notice
©2010 GENERAL TOOLS & INSTRUMENTS
Notice - we are not responsible
for typographical errors.
MAN#NGD8800 12/10
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