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Item # 920 Series, 920 Series Continuous Biogas Analyzers


The Nova 920 Series analyzers have been designed for monitoring recovered and processed gases from biogas installations. This equipment continuously removes moisture from the wet sample gas without the need for cooling water, compressed air, or failure-prone thermoelectric elements.

The 920 Series comes complete with pre-filter, sample pump, flow meter, continuous moisture removal system, long-life O2 sensor, infrared CO2/CH4 detector, low flow sensor, alarm relay contacts, and 4-20mA outputs for each gas measured. Sensors / detectors are mounted in an internal dedicated enclosure which is heated and temperature controlled to reduce drift due to ambient temperature swings. The internal sensor enclosure is removable to allow quick field change of sensors. The infrared detector can be cleaned in the field if necessary by the on-site technician.

On all models with Autocalibration, all calibration functions are controlled through the display rather than through manual controls. The operator only has to input the calibration frequency and leave calibration gas cylinder connected to the analyzer - the rest is automatic. Diagnostics and troubleshooting information are also included in the display interface. This assists operators to quickly determine the cause of an alarm and get the analyzer back on line.


Models
  • 920 - O2
  • 921 - CH4
  • 922 - O2 and CH4
  • 923 - CO2 and CH4
  • 924 - O2, CH4, and CO2




Specifications  · Applications  · Features  · Options  · Calibration

Specifications

Method of Detection
O2 and H2S by electrochemical sensor, CH4 & CO2 by infrared detector

Ranges Available
0-25.0% O2; any range between 0-50.0% to 0-100.0% CH4, CO2; 0-200 to 0-2,500 PPM H2S; 0-1000 BTU

Resolution
0.1% on CO2, O2, & CH4, 1 PPM H2S, 1 BTU

Accuracy & Repeatability
±1% of full scale for O2 / CO2 / CH4

Drift
Less than 2% of full scale per month

Response Time (T-90)
Less than 30 seconds not including sample line delay

Ambient Temperature Range
40 to 104°F (4 to 40°C). Optional: -20°C to 55°C (-4°F to 131°F) with Outdoor Pkgs.

Linearity
±1% of full scale for each gas measured

Size & Weight
Approx. 24" H x 24" W x 10" D @ 90 lbs (61 x 61 x 25 cm @ 41 kg) Physical data may vary depending on options required

Power
115 VAC 60 Hz (220 VAC 50 Hz available)

Output Options
Isolated 4-20 mA standard
RS232, RS485, MODBUS®, Ethernet outputs optional

Alarms
Available: High O2, high CO2, low CH4, low flow; SPDT relays with 10A contacts

Analyzer Type
Landfill Gas Analyzer

Primary Gas(es) to be Measured
O2 / CO2 / CH4 / H2S

Hazardous Area Rating Options
Class 1 Div 1 or Class 2 Div 2, using purge system
General Purpose Non-Hazardous Areas


Applications
For continuous analysis of oxygen (O2), methane (CH4), and/or carbon dioxide (CO2) in recovered gases from biogas applications. Hydrogen sulfide (H2S) readout optional.


Features
  • Temperature-controlled sensors for maximum stability
  • Long-life electrochemical O2 sensor
  • Infrared detector for reliable measurement of CH4 & CO2
  • Stainless steel hard tubing and corrosion-resistant components for internal sample path
  • Cabinet positive-pressure system to minimize the corrosive effects of hydrogen sulfide (H2S) on cabinet electronics & sensors
  • Built-in sample pump, pre-filter, filters, and flow meter
  • Automatic condensate removal
  • Rugged NEMA4 (IP65) enclosure
  • Isolated 4-20mA output for each gas
  • Low flow alarm & relay
  • Automatic calibration with touch screen LCD display
  • Diagnostic alarms with troubleshooting guidance
  • 'Cal-Now' button enables full calibration at any time by activating only one switch


Options
  • H2S & BTU readout (see ranges & models)
  • Gas hi/low alarms with relay contacts
  • Class 1 Division 2 rated purge kit for use in hazardous areas
  • Outdoor weather packages for operation from -20°C up to 55°C (-4°F to 131°F)


Calibration
  • Ambient air for O2 span and CO2 & CH4 zero
  • Analyzed calibration gas of CO2 and CH4 in nitrogen for CO2 & CH4 span and O2 zero


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