CALIBRATION TECHNOLOGIES   GG-NH3-2

GG-NH3-2   
1,352.18

• 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.

• Compressor Rooms
• Electrical shutdown
• Heat Treatment
• Tank Rooms
• Sea Vessels
• Refrigeration Systems
• Cold Storage
• Pulp and Paper
• Chemical Plants
• Breweries
• Refineries

• 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.