|
Hydrogen
Leak Detector
Portable
Leak Tester
Model SP205ASC |
 The
Model SP-205ASC is specially designed to detect the presence
of gases used in the Fuel Cell and Semiconductor industries.
The
instrument incorporates a sintered metal oxide sensor (MOS)
and internal pump to provide rapid response to either Hydrogen
(H2) or Hydride (PH3) gases in low concentrations. A filter
protects the sensor from particulates and some liquids while
a probe allows the instrument to pinpoint leaks. Target gases
produce an Audible tone (ticking) and Visual response (flashing
LED) that occur more rapidly as gas concentration increases.
Readily available Alkaline batteries (4-AA) power the instrument,
which also includes a Low Battery alarm and Buzzer Silence
Switch. The instrument is complete with batteries, probe,
filter & filter housing, carrying case with wrist strap,
and response check gas. |
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| Specifications |
| Detection
Principle: |
Catalytic/Semiconductor
combination.
Sample-drawing with special built-in diaphragm pump |
| Gases
Detected: |
Phosphine
( PH3) |
Arsine
(AsH3) |
Diborane
(B2H2) |
Silane
(SiH4) |
Hydrogen
(H2) |
| Detectable
Leak Amounts:
(atm • cc/sec) |
1.5X10 |
1.0X10 |
0.5X10 |
2.5X10 |
5.0X10 |
| Detectable
Concentration: |
0.3
ppm |
0.2
ppm |
0.1
ppm |
0.5
ppm |
1.0
ppm |
| Response
Time: |
< ten (10) seconds |
| Alarm
Indication: |
Intermittent
buzzer and LED lamp |
| Power
Source: |
Size
"AA" Alkaline battery cells (4)
Continuous operating time approximately 7 hours at 20° C
Low Voltage Alarm |
| Operating
Temperature: |
0°
C ~ +40° C |
| Outer
Dimension: |
68
(w) x 155 (h) x 32(d) mm |
-
Optional Batteries: Rechargeable
NMH
- Specifications subject to change.
|
| Technical
Assistance |
| Contact: |
Jay
Fitzgerald or Blair Simmons |
| E-mail: |
info@fuelcellsensor.com |
| Address: |
Argus
Group
46400
Continental Dr.
Chesterfield,
Michigan 48047 USA |
| Telephone: |
586-840-3200
(local)
1-800-873-0456
(toll free) |
| Fax: |
586-840-3201 |
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| Operation |
- Power
instrument ON
- Use
the Gas Selection Switch to select either Hydrogen (H2)
or Hydride (PH3) response
-
In fresh air rotate the Sensitivity Set Wheel to null out
background gases
-
Pass the probe slowly over potential leak sites to pin point
leak
|
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| Sensitivity
Setting & Concentration |
Gas
concentration can be approximated by turning the Sensitivity Set
Wheel counterclockwise from the original “null” setting
according to the following Tables.
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The
electrical circuit (Fig. a) is based on a wheatstone bridge circuit,
including the detecting and compensating elements and the fixed
resistors (Fig. b).
The
sensor elements are formed from sintered metal oxide semiconductors
(n-type semiconductors: tin oxide, zinc oxide, etc.) on the coils
of fine platinum wire (Fig. a).
The
sensor elements are heated to several hundred degrees centigrade.
As a reducing gas is chemically absorbed on the surface of the sensor
elements, the electrical conductivity of the semiconductor increases
and the resistance of the coil and semiconductor combination decreases.
As a result, the bridge circuit becomes unbalanced and the instrument
provides a response (ticking and flashing LED) in proportion to
the gas concentration.
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| Detector
Unit Description |
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Included:Carrying
Case, Check Gas, Filter Housing, Filter, Batteries
Optional: Ear Phone, Rechargeable Batteries & Charger
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