Key Features
- Ammonia selective catalytic bead sensor technology
- Useful for activation of electrical shunt-trip up to 20,000 ppm
- Low cost compared to pricey infrared type ammonia sensors
- Industry standard linear 4/20 mA output
- Absolutely no Zero drift compared to other catalytic bead type sensors
- Sensing element designed for long life in harsh industrial environments
- Designed to perform in temperatures of -40°F to +150°F
- Accurately monitor explosive NH3 levels for emergency response situations
- Real-time continuous monitoring
- Use with GasGuard NH3 low-ppm sensor for complete compressor room protection
The GasGuard NH3-2% is
designed to detect and monitor
potentially explosive levels of
ammonia vapors in the event of a
catastrophic failure. Codes specify
an electrical shunt-trip of the
mechanical room 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% allows for
an earlier trip level of 12.5%LEL.
The GasGuard NH3-2% 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% provides
an industry standard linear 4/20 mA
output signal proportional to 0-2%
(0-20,000 ppm) of ammonia. The
totally potted transmitter is
compatible with most gas detection
systems and PLCs. 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% sensor in conjunction
with low-ppm GasGuard NH3 sensors
ensures a second-stage line of defense in
the event of a serious ammonia leak.
Intended for electrical shutdown, the
GasGuard NH3-2% provides protection
against potentially explosive situations.
From hot mechanical rooms, to acid
washdowns of processing areas, the
GasGuard NH3-2% is prepared to survive
in just about any harsh industrial condition.
Every circuit board is sealed forever in
potting compound, protecting sensitive
electronic components and copper tracing
from corrosion. A specially vented
chemical-resistant polycarbonate enclosure
protects the sensor from accidental
damage, weather and direct hose-hits from
clean-up crews.
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.