- 21 -
10. Detection Principle
Hot-wire Semiconductor Sensor
The sensor is constructed of a metal oxide semiconductor that is sintered in a ball on
a platinum wire coil that functions as both a heater and electrode. It detects the
change of electrical conductivity occurred by oxidation reaction and adsorption of
combustible gas on the surface of the oxide semiconductor.
- 20 -
9. Specifications
Model XP-703D
Ⅲ
Target Gas
H
2
, AsH
3
, B
2
H
6
, SiH
4
, PH
3
Detection Principle
Hot-wire semiconductor sensor (Refer to page 21.)
Gas Sampling Method
Extractive type
Detectable Leak Rate
H
2
: 5.07 x 10
-7
, AsH
3
: 2.53 x 10
-7
, B
2
H
6
: 1.01 x 10
-7
, SiH
4
: 2.53 x 10
-7
,
PH
3
: 1.52 x 10
-7
Detectable Gas
Concentration
H
2
: 1.0ppm, AsH
3
: 0.5ppm, B
2
H
6
: 0.2ppm, SiH
4
: 0.5ppm, PH
3
: 0.3ppm
Response Time
Within 10 seconds (for 300% of detectable gas concentration)
Rated Power Supply
Size AA alkaline batteries (LR6) x 2
Battery Life
*1
Approx. 12 hours (with size AA alkaline batteries at 25 degrees C)
Degree of Protection
*2
Equivalent to IP22
*3
Operating Pressure Range Atmospheric pressure (800 to 1100hPa)
Operating Temperature and
Humidity Range
0 to 40 degrees C / less than 85% RH (with no condensation)
Dimensions
Approx. 38 (W) x 130 (H) x 32 (D) mm (excluding protrusions)
Weight
Approx. 190g (including batteries and soft case)
*1
: The battery life may vary based on the environmental conditions, operating conditions,
storage time, battery manufacturer, etc.
*2
: While the Gas Leak Detector is inside the soft case.
*3
: “Equivalent to IP22” means that protection is provided against the approach of a finger to
any hazardous product location (IP2x) and that protection is provided against the
negative influence on the product interior from water drops falling within 15° of
perpendicular on both sides of the exterior of the product for 2.5 minutes each in four
location (for a total of 10 minutes) (IPx2).
