General NGD8800 User manual

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 ----------------------------------------- 2
3. SPECIFICATIONS ------------------------------- 3
4. OPERATION GUIDE --------------------------- 4
5. PARTS & CONTROLS ---------------------- 5-6
6. GETTING STARTED -------------------------- 7
6-1 Installing Batteries ------------------------- 7
6-2 Automatic Circuit/Reset Feature ------ 8
6-3 Feature Sensitivity Adjustment -------- 9
7. OPERATING PROCEDURES --------- 9-12
8. REPLACING NEW SENSOR ------------- 12
9. CLEANING --------------------------------------- 13

COMBUSTIBLE GAS DETECTOR
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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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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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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
5-1 Panel Description
Ϥ
9
COMBUSTIBLE
GAS DETECTOR

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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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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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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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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
WARNING!
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.