Key Features
- Explosion-proof enclosure for classified areas
- 0/2% (20,000 ppm) range
- No zero signal drift
- Electronics potted to eliminate internal corrosion
- Ammonia selective catalytic bead sensor technology
- Industry standard linear 4/20 mA output
- Corrosion, weather and chemical resistant fiberglass composite sensor enclosure
- Operating temperature from -40°F to +120°F
- Accurately monitor explosive NH3 levels for emergency response situations
- Real-time continuous monitoring for early leak detection.
- Sensing element designed for long life in harsh industrial environments
The GasGuard NH3-2%-EXP is
designed to detect and monitor
potentially explosive levels of
ammonia vapors in the event of a
catastrophic failure. Most codes
specify an electrical shunt-trip at a
level not higher than 25% LEL to
remove potential ignition sources in
the event of a serious ammonia
leak. The GasGuard NH3-2%-EXP
allows for an earlier trip level of
12.5%LEL.
The GasGuard NH3-2%-EXP utilizes
an ammonia selective catalytic bead
sensor technology with a matched
pair of detector elements. When
ammonia vapors enter the sensor,
the passive bead remains un-
changed while the active detector
bead catalyzes the oxidation of gas,
generating heat and changing its
resistance. The resulting change in
resistance is accurately measured
across the bridge circuit.
The GasGuard NH3-2%-EXP
provides an industry standard linear
4/20 mA output signal proportional
to 0-2% (20,000 ppm) of ammonia.
Long sensor life with minimal span
adjustment can be expected in
most mechanical room
applications. The sensor is
designed for simple calibration and
is field replaceable.
Applications
- Compressor Rooms
- Electrical shutdown
- Heat Treatment
- Tank Rooms
- Sea Vessels
- Refrigeration Systems
- Cold Storage
- Pulp and Paper
- Chemical Plants
- Breweries
- Refineries
Benefits
- Low cost explosion protection
- Long sensor life (5 yrs typical)
- Simple operation & calibration
Since low-ppm sensors can’t detect high
enough and high-ppm sensors can’t detect
accurately at low levels, the use of the
GasGuard NH3-2%-EXP sensor in
conjunction with low-ppm GasGuard NH3-
EXP sensors ensures a second-stage line
of defense in the event of a serious
ammonia leak. Intended for electrical
shutdown, it provides protection against
potentially explosive situations.
Typical sensor life is 5-7 years, with
minimal to no cross-sensitivity to most other
gases. Field replaceable sensor element
keeps long term maintenance simple and
low cost.
Every circuit board is potted to completely
eliminate corrosion to the electronic
components and copper tracing on the
circuit board. An explosion-proof aluminum
enclosure houses and houses the
transmitter.
The GasGuard NH3-2%-EXP is delivered factory calibrated and ready to
install. The assembly includes sensor, transmitter and explosion-proof
enclosure. Use the model numbers below to order.
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