NOVA 381K PORTABLE TRI-GAS ANALYZER FOR H2/N2/AIR PURGING

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NOVA 381K
PORTABLE TRI-GAS ANALYZER FOR HYDROGEN/NITROGEN/AIR PURGING 

APPLICATIONS

For checking purity of hydrogen (H2) in H2-cooled generators and synchronous converters. The Model 381 Series will also monitor the safe purging of H2 during shutdown or startup. This model is designed specifically for generators that are purged with nitrogen (N2) instead of carbon dioxide (CO2).

FEATURES
• Rugged design that is easy to operate and maintain
• Fast warm up and response
• Monitors 0-100% H2 in air, 0-100% H2 in N2, 0-100% Air in N2
• Long-life thermal conductivity H2 cell
• Rugged long-life electrochemical O2 sensor
• Digital readout displays active range
• Rechargable battery operation
• Built-in flow meter, flow control valve, and pump
• Built-in pressure regulator prevents over pressuring of pump and sensor
• Suitcase cabinet has carry handle and is weatherproof when closed
• Sample pressure ranges 0.5 PSI to 125 PSI

RANGES

• Range 1: 0-100% H2 in Air
• Range 2: 0-100% H2 in N2
• Range 3: 0-100% Air in N2

DESCRIPTION

The Nova 381 Series Tri-Gas Analyzer is designed for monitoring the H2 purity inside a power generator and to monitor the purging procedure during a generator shutdown or startup. This analyzer is specifically for generators that are purged with N2 instead of the more commonly-used CO2.

The analyzer contains a temperature compensated thermal conductivity (T/C) cell, electochemical O2 sensor, amplifier board, digital readout, range switch, pressure regulator, gas flow control valve, pump and a flow indicator. A 4-20mA recorder output is standard.

The T/C cell does not burn the sample nor is it consumed in any way, so it has a life expectancy of over 10 years. The electrochemical O2 sensor typically has 3-5 year life and is easy and inexpensive to replace. Measurement results are fast and accurate. A rechargeable 'gel cell' battery provides enough power for about 4-6 hours of continuous operation and the analyzer can be used while it is being recharged

SPECIFICATIONS
Description
Method of Detection: Thermal conductivity (T/C) cell, electrochemical O2 sensor
Ranges Available: Range 1: 0-100% H2 in Air; Range 2: 0-100% H2 in N2; Range 3: 0-100% Air in N2
Resolution: 0.1% of gas measured
Accuracy and Repeatability: Range 1: ± 1% of Full Scale; Range 2: ± 2% of F.S.; Range 3: ± 2% of F.S.
Drift: H2 in N2 or Air in N2, ± 2% F.S. per week maximum drift
         0-100% H2 in Air range is ± 0.4% per week maximum 

Response Time (T-90): 10-15 seconds to 90% step change - not including sample transport time
Ambient Temperature Range: 32-120°F (0-50°C)
Linearity: ± 1.0% of F.S. on H2 in Air range. ± 2% of F.S. in H2 or Air in N2 ranges
Size and Weight : Approx. 9½" L x 7" W x 6½" H @ 8 lbs (24 x 17 x 18 cm @ 3.6 kg)
Power: 115VAC 60Hz for recharging (220VAC 50Hz available)
Output Options: 4-20 mA or 0-1 VDC