Combustible
Gas Detector
Model 8059 |
| Description |
 |
Matheson's Model 8059
Combustible Gas Detector is a rugged, portable instrument
designed for monitoring combustible gas levels in ambient air.
Weighing just 5.3 ounces, this compact unit is small enough to
fit into a shirt pocket, or it can conveniently be worn on the
belt. A two-stage audible and visual alarm provides early
warning of potentially explosive conditions. |
| The Model
8059 continuously samples the air by diffusion for combustible
gases and vapors. Calibrated on methane, the unit sounds a
pulsating audible alarm with flashing LED at 10% of the Lower
Explosive Limit (LEL), and a continuous audible alarm with
steady LED at 25% LEL. The Model 8059 also provides 1st and
2nd-stage alarms for hydrogen (10% and 30% LEL), propane (15%
and 40% LEL) and ethylene (15% and 40% LEL). |
| Gases
Detected |
| Although calibrated on
methane, the Model 8059 will detect virtually any combustible
gas. The levels at which the alarms will activate depends upon
the Lower Explosive Limit for the particular gas being detected.
The Model 8059 has been shown to automatically activate 1st and
2nd stage alarms for the following gases. |
|
Gas
|
1st
stage alarm |
2nd
stage alarm |
| Methane |
10%
LEL |
25%
LEL |
| Hydrogen |
10%
LEL |
30%
LEL |
| Propane |
15%
LEL |
40%
LEL |
| Ethylene |
15%
LEL |
40%
LEL |
| Principle
of Operation |
 |
The Model 8059 utilizes
an explosion-proof catalytic combustion type sensor, with
intrinsically safe electronic circuitry. The sensor consists of
a coiled platinum filament coated with a platinum catalyst. When
a combustible gas or vapor contacts the sensor, the gas is
oxidized and the temperature of the platinum coil increases.
This results in a proportional change in the resistance of the
platinum filament. Gas concentration is then measured as a
voltage change in a wheatstone bridge circuit. The circuit also
utilizes a temperature compensation element to correct for
ambient temperature changes. |
| Specifications |
| Detection
Principle: |
Catalytic
combustion sensor |
| Power
Source: |
4
x Size AA NiCad batteries (remote charger included) |
| Operating
Time: |
Up
to 4 hours with full charge (Alkaline batteries, not included,
will provide up to 10 hours continuous operation) |
| Recharging
Time: |
14
hours from a fully discharged state |
| Alarm
Settings: |
Methane:
10% and 25% LEL
Hydrogen: 10% and 30% LEL
Propane: 15% and 40% LEL
Ethylene: 15% and 40% LEL |
| Alarm
characteristics: |
1st
stage: Pulsating audible tone; Flashing red LED
2nd stage: Continuous audible tone; Steady red LED |
| Response
Time: |
1st
stage: 3-5 seconds
2nd stage: 10-20 seconds |
| Temperature
Range: |
-10°C
to 40°C (14-104°F) |
| Low
Battery Indicator: |
Steady
tone; flashing green LED |
| Dimensions: |
2.5W
x 3.4H x 1D (inches)(65mm x 85mm x 25mm) |
| Weight: |
5.3
ounces (150g) |
| Warranty: |
One
year |
| Ordering
Information |
| Model |
Description |
| 8059 |
Combustible
gas detector with factory set two-stage alarm, leather case with
belt loop, NiCad batteries (4), remote 115 VAC charger, test gas
vial. |
| 8059-220 |
Same
as 8059 with 220 VAC charger. |
| 8059-01 |
Replacement
test gas vial. |
| 8059-02 |
Replacement
protective case. |
| 8501 |
Replacement
115 VAC charger. |
| 8502 |
Replacement
220 VAC charger. |
| For
more information, request Matheson Tech-Brief TB-239. |
|
|
