NOVA 920 SERIES CONTINUOUS BIOGAS ANALYZER

Alat Laboratorium Lingkungan

NOVA 920 SERIES CONTINUOUS BIOGAS ANALYZERS 

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; detector may be cleaned in the field
• 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 condensation removal without the use of cooling water, compressed air or thermal-electric         elements
• Rugged NEMA4 (IP65) enclosure
• Isolated 4 - 20 mA output for each gas
• Low flow alarm & relay
• Automatic analyzer calibration with full-color touch screen LCD display
• Diagnostic alarms with troubleshooting guidance
• 'Cal-Now' button enables full calibration at any time by activating only one switch 

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

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)

DESCRIPTION
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
Other analysis options available (added as suffix to model #):
• H1 - H2S, range 0 - 200 up to 0 - 2500 PPM H2S
• BTU - BTU readout, range 0-1000 BTU
• Other combinations can be requested

SPECIFICATIONS

Description
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 and Repeatability: ±1% of full scale
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 and Weight: Approx. 24" H x 24" W x 10" D @ 90 lbs (61 x 61 x 25 cm @ 20 kg) Physical data may vary                                    depending on options required  
Power: 115VAC 60Hz (220VAC 50Hz available)
Output Options: Isolated 4-20mA standard
Alarms:  High O2, high CO2, low CH4, low flow; SPDT relays with 10A contacts