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Biosystems Gas Detectors



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Biosystems NXP™
Single Channel Fixed Gas Detection System
From Sperian Instruments now Honeywell Analytics

Effective May 31, 2011, all the Biosystems NXP &Biosystems EXP Fixed Gas Detection Systems
as well as the Biosystems FXC Fixed System Controller were discontinued.
No replacement sensors or parts are available any longer

Please click here or contact us for the Otis Instruments alternative systems

Sperian Instrument's Biosystems NXP Single Channel Fixed Gas Detector in Safety Orange Case


Biosystems NXP fixed gas detector provides single point protection in less than 5 minutes – just plug it in and be protected!

Biosystems NXP fixed gas detection system can be used as a stand alone monitor, a remote sensing head or as a transmitter in a larger system.

NXP systems are designed to provide continuous round-the-clock monitoring for a variety of common atmospheric hazards including oxygen deficiency and/or enrichment, combustible gases and vapors, and specific toxic contaminants such as carbon monoxide (CO), hydrogen sulfide (H2S), sulfur dioxide (SO2), chlorine (Cl2), phosphine (PH3), carbon monoxide with reduced sensitivity to hydrogen (CO-H2) ammonia (NH3), combustible gas (LEL) and oxygen (O2).

Sensors may be integrally mounted to the NXP controller housing, or remotely up to 50 feet away from the controller.    

Best of all, the NXP offers incredible standard features: integrated twin color high-intensity strobes, integrated 105 db audio alarm, on-board event logger, real time LCD readout…..all in a sleek, tough IP66 housing.

Sperian Instruments NXP Single  Channel FIxed Gas Detector in Grey Case
All normal procedures, including fully automatic calibration adjustment, are controlled with a single front mounted "MODE" button.



  • Integrated, twin color high-intensity strobes offer 200+ degree visible alarm. Yellow for Warning, Red for Danger.
  • Integrated 105 dB horn offers highly distinctive audible alarm.
  • Easy-to-read 3-digit backlit LCD screen displays real time gas readings.
  • Tough IP66, NEMA 4X housing protects unit in harsh conditions or during wash- downs.
  • Wide range of customizable options including: alarm levels, relay modes and strobe and horn enable/disable.
  • Unit plugs into a standard AC wall outlet or can be wired into a controller power supply.
  • On-board event logger records last 100 alarm events.
    Event logger has battery backup.
  • Remote sensor option allows you to place the sensor up to 50 feet from base unit — allowing base unit to be placed in convenient location
  • Compatible with standard 3 wire 4-20 mA wiring.
  • Sensors can be replaced without declassifying area.
  • In "stand-alone mode", single person, non- intrusive calibration can be done at the sensor head.
  • Front mounted mode button can be disabled, if required.
  • Three user-available programmable on- board relays: Warning, Danger and Fault.
  • Fault relay notifies for loss of power or missing sensor.
  • Optional alarm-latching keeps unit in alarm until manually disarmed
  • Twin NPT connection ports for fast connect without custom fittings.
  • Firmware upgradable via IrDA connection.
  • Includes 6 foot power cord standard.
    Optional 15 foot power cord available.
  • Uses interchangeable smart sensors for easy change out without reconfiguration.
  • Comes with full 18 month warranty


NXP Technical Specifications

Case NEMA 4X type, IP66
Dimensions ZoneGuard controller: 11" (279.4 mm) x 6.50" (165.1 mm) x 3.56" (90.4 mm)
Weight 1.5 lbs (1.14 Kg)
Humidity Range Oxygen - 15% to 90% Rh, non-condensing
Power Source 110/220 VAC or 12-24 VDC
Relays 3: Danger, Warning and Fault
Signal Output 4-20 mA; Fault < 2mA
Temperature Range System components designed to function over range of -4° F to 122° F (-20° C to 50° C)
Type of sensor installed may modify range.
Wiring: Comes standard with 6' AC power cord or order optional 15' power cord.
Order cables for remote sensor kit from 5' to 50'.

Each NXP system includes the controller with all standard alarms, relays and electronics installed in a NEMA 4X fiberglass housing, and sensor.

Note: conduit, wire and other components necessary to connect remotely located sensors with the instrument controller
are not included. Order the cable separately - part numbers below.

NXP System Ordering Information

NXP with Industrial Grey Housing

NXP System
54-55-010 CO, Carbon monoxide 0 - 1000 ppm 1.0 ppm
54-55-020 H2S, Hydrogen sulfide 0 - 200 ppm 1.0 ppm
54-55-030 SO2, Sulfur dioxide 0 - 75 ppm 0.1 ppm
54-55-080 Cl2, Chlorine 0 - 50 ppm 0.1 ppm
54-55-130 PH3, Phosphine 0 - 20 ppm 0.1 ppm
54-55-190 CO-H, (CO reduced sensitivity to H2) 0 - 1000 ppm 1.0 ppm
54-55-210 NH3, Ammonia 0 - 100 ppm 1.0 ppm
54-55-800** LEL combustible 0 - 100% LEL 1.0 % LEL
54-55-900 O2 Oxygen 0 - 30% / vol. 0.1 %

NXP with Safety Orange Housing

NXP System
54-55-011 CO, Carbon monoxide 0 - 1000 ppm 1.0 ppm
54-55-021 H2S, Hydrogen sulfide 0 - 200 ppm 1.0 ppm
54-55-031 SO2, Sulfur dioxide 0 - 75 ppm 0.1 ppm
54-55-081 Cl2, Chlorine 0 - 50 ppm 0.1 ppm
54-55-131 PH3, Phosphine 0 - 20 ppm 0.1 ppm
54-55-191 CO-H, (CO reduced sensitivity to H2) 0 - 1000 ppm 1.0 ppm
54-55-211 NH3, Ammonia 0 - 100 ppm 1.0 ppm
54-55-801** LEL combustible 0 - 100% LEL 1.0 % LEL
54-55-901 O2 Oxygen 0 - 30% / vol. 0.1 %

** LEL configuration comes with the Explosion Proof Remote Sensor Kit and a LEL Sensor, Cable for Remote Sensor Kit is ordered separately.

NOTE: If the sensor is mounted in a potentially explosive environment, sensor must be connected to the base unit following NEC guidelines for hazardous locations.

Remote Sensor Kits
54-57-00N Non-Explosion Proof Sensor Kit
54-57-00E Explosion Proof Sensor Kit
Cables For Remote Sensor Kit
54-57-05C 5ft / 1.5m Remote Sensor Cable
54-57-10C 10ft / 3.0m Remote Sensor Cable
54-57-50C 50ft / 15m Remote Sensor Cable

Biosystems NXP Replacement Sensors

Part # Description Range Resolution
54-57-01S CO, Carbon Monoxide 0 - 1000 ppm 1.0 ppm
54-57-02S H2S,  Hydrogen Sulfide 0 - 200 ppm 1.0 ppm
54-57-03S SO2, Sulfur Dioxide 0 - 75 ppm 0.1 ppm
54-57-08S Cl2, Chlorine (specific) 0 - 50 ppm 0.1 ppm
54-57-13S PH3, Phosphine 0 - 20 ppm 0.1 ppm
54-57-19S CO-H (CO, reduced sensivity to H2 0 - 1000 ppm 1.0 ppm
54-57-21S NH3, Ammonia 0 - 100ppm 1.0 ppm
54-57-80S LEL, Combustible Gas 0 - 100% LEL 1.0% LEL
54-57-90S O2, Oxygen 0 - 30% / vol. 0.1%


WARNING! Honeywell Analytics - Biosystems equipment should only be used in conjunction with the manufacturer's instructions.
Failure to follow such instructions could result in serious injury or fatalities.


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