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The Nova 436 Series Tri-gas analyzer is designed specifically for monitoring H2 purity in a power generator and to monitor the purging procedure during shut down. The analyzer can measure the following gases by switch selection:

Range 1: 0-100.0% H2 in Air
Range 2: 0-100.0% H2 in CO2
Range 3: 0-100.0% Air in CO2

A 4-20mA recorder output is provided for the range of 85-100% H2 in Air.

The Model 436 analyzer is typically available in a single ex-proof cabinet with all capabilties built-in. Or, it may be divided into 2 sections that are electrically connected. The control section contains the main microprocessor boards as well as the touch-screen display, alarm contacts, and calibration & function switches. The gas detector section contains the temperature controlled thermal-conductivity (TC) cell, solenoid valves, gas pressure regulator, flow meter, and 2 flame arrestors.

Either the gas detector section on its own or both gas detector and control sections may be purchased in explosion-proof cabinets. The explosion-proof cabinets are UL listed and CSA certified for use in Class 1, Division 1, Groups BCD hazardous areas. If the gas detector section only is explosion-proof, the control section is typically enclosed in a 19" rack mount cabinet for use in a general purpose, non-hazardous area. The control section can also be mounted in a NEMA 4 wall mount cabinet.

Cabinets, 436N4N7: Gas Detector in Class 1, Division 1, Groups BCD Explosion-proof Cabinet; Control Section in General Purpose NEMA 4 Cabinet
Unit of Measure

Specifications

Method of Detection

 N/A Temperature controlled thermal conductivity (T/C) cell, cannot be burned out due to loss of flow or changing gases

Ranges Available

 N/A Range 1 : 0-100% H2 in Air Range 2 : 0-100% H2 in CO2 Range 3 : 0-100% Air in CO2

Resolution

 N/A ±0.1% of gas measured

Accuracy & Repeatability

 N/A ±1% F.S except in 85-100% H2 in Air range which is within 0.2% absolute H2

Drift

 N/A H2 in CO2 or Air in CO2 1% F.S. per week maximum drift, 0-100% H2 in Air range is ±0.2% per week

Response Time (T-90)

 N/A 10-15 seconds to 90% step change - not including sample transport time

Ambient Temperature Range

 N/A 0 to 49 ºC32 to 122 ºF

Linearity

 N/A ±0.4% of F.S. on H2 in Air range, ±1% of F.S. in H2 or Air in CO2 ranges

Size & Weight

 N/A Control: NEMA 4: 51H x 41W x 26D cm (20"H x 16"W x 10"D) Detector: EX-PROOF: 33H x 33W x 31H cm (13"H x 13"W x 12"D)

Power

 N/A 115 VAC, 60 Hz 220 VAC, 50 Hz

Output Options

 N/A 4-20mA into 500 ohms non-isolated standard

Alarms

 N/A H2 purity alarm

Analyzer Type

 N/A Tri-Gas Analyzer

Hazardous Area Rating Options

 N/A Control Cabinet - General Purpose, Non-Hazardous Detector Cabinet - NEMA7 Class 1 Division 1 Groups BCD

Applications

N/A For continuous analysis of hydrogen (H2) purity and for purge monitoring of hydrogen-cooled generators and synchronous converters.

Features

N/A

  • One analyzer monitors all 3 gases for purity (Range 1) or purging (Ranges 2 and 3): Range 1: 0-100% H2 in Air; Range 2: 0-100% H2 in CO2; Range 3: 0-100% Air in CO2
  • Bright digital readout
  • 4-20mA isolated output for 85-100% of H2 in Air
  • Thermal-conductivity cell with high accuracy and repeatability, cannot be burned out
  • Explosion-proof gas detector enclosure suitable for Class 1 Division 1 Group BCD rated areas
  • Fast response (T90 -10 to 15sec)
  • Fast 'one-touch' automated calibration
  • Built-in pressure regulator and line pressure indication
  • 2 levels of low H2 purity alarms

Options

N/A

  • Isolated 4-20mA output for any range selected
  • Oil vapor filter assembly (recommended)

Calibration

N/A

  • Channel 1 - Air for Zero, 100% H2 for Span
  • Channel 2 - 100% CO2 for Zero, 100% H2 for Span
  • Channel 3 - 100% CO2 for Zero, Air for Span
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