Brandt Intruments, Sperian Instruments, Biosystems, ZoneGuard Single Channel Fixed gas detector,Compressed air purification, PosiChek3 SCBA,four gas meters
Sperian Instruments now
Honeywell Analytics
Biosystems Gas Detectors



Biosystems Index
.. Single Gas Portables..
.. Multi-Gas Portables

..   ..MultiPro
...   .MultiVision
...   .PhD6
...   .Cannonball3
.. Fixed Point Systems
.. Air Purification Panel
. .Respirator Test Bench
. .Cal Gas & Accessories
. .Application Notes




Biosystems, Sperian Instruments, Honeywell, gas detectors, MultiPro, PhD6, ToxiPro, ToxiLTD, IQ Docking Stations, PosiChek3 SCBA Testing, calibration gas

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

Discontinued Effective January 01, 2011
Effective May 15, 2013: No service, parts or sensors are available

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

home biosystems index Biosystems ZoneGuard

Sperian Biosystems ZoneGuard Fixed Gas Detection System with External Visual Alarm


Biosystems ZoneGuard is a microprocessor based fixed gas detection system with input from a single oxygen, combustible or toxic sensor.

ZoneGuard 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), and nitrogen dioxide (N02).

Sensors may be integrally mounted to the ZoneGuard controller housing, or remotely up to 50 feet away from the controller. Remote detector assemblies are available in explosion proof or non-explosion proof versions.   

Sperian Biosystems ZoneGuard Automatic Calibration Adjustment All normal procedures, including fully automatic calibration adjustment, are controlled with a single button located at the controller.

Other standard features include two independently adjustable alarm setpoints, built-in audible alarm, easily-read, backlit LCD display, bright LED alarm light indicators, and relay contacts for low and high alarm conditions. Optional accessories include externally mounted high intensity strobe lights and high intensity horn. 

ZoneGuard Features: 

  • Round-the-clock monitoring for a wide variety of atmospheric hazards 
  • Easy to install and operate 
  • One button operation 
  • Fully automatic calibration adjustment 
  • Weatherproof NEMA 4X controller housing 
  • Easy-to-read, backlit LCD display 
  • Built-in loud audible alarm 
  • Two independently adjustable alarm levels 
  • Output relays for low and high alarm conditions 
  • Optional external strobe lights and high intensity horn 

ZoneGuard Technical Specifications

ZoneGuard Outputs Low and high alarm. DPDT relay - contacts rated 5 Amp at 250 VAC, non-inductive load
ZoneGuard Display 8 character 14-segment backlit LCD for gas readings and other messages
ZoneGuard Indicators (LED) Power on: green; low alarm: amber; high alarm: red
Audible alarm Built-in audible alarm (85 dB at 3 feet)
Power Requirements 110 VAC - 50/60 Hz
Temperature Range System components designed to function over range of-40° F to 110° F (-40° C to 43° C) (Type of sensor installed may modify range.)
Humidity Range 0 to 100% RH
Intrinsic Safety Sensors installed in explosion proof remote housings: Classified by UL and CSA as Explosion-Proof for Class I, Division 1, Groups A, B, C and D hazardous locations.
Weather Protection Controller housing: NEMA 4X enclosure (IP rating of 654)
Dimensions ZoneGuard controller: 10" (25 cm) x 7.5" (19 cm) x 5.25" (13 cm)
Wiring: For oxygen remote detectors use (minimum) 22 gauge AWG, 6 conductor twisted-pair shielded with drain.
For toxic use (minimum) 22 gauge AWG, 4 conductor twisted-pair shielded with drain.
For combustible use 18 gauge AWG, 4 conductor twisted-pair shielded with drain.

Each ZoneGuard system includes the controller with all standard alarms, relays and electronics installed in a NEMA 4X fiberglass housing, and sensor. When remotely mounted sensors are specified the components provided include both the sensor and remote detector housing. Specify the type of sensor and whether the sensor is to be housed in an explosion proof or non-explosion proof sensor housing at the time the system is ordered. (Combustible sensors may only be mounted in explosion proof remote sensor housings.) Note: conduit, wire and other components necessary to connect remotely located sensors with the instrument controller are not included.

ZoneGuard System Part Numbers

ZoneGuard system for: With integrally mounted sensor
With remotely located sensor
in standard housing
With remotely located sensor
in explosion proof  housing
Part No. Part No. Part No.
Oxygen 54-16-90 54-16-900 54-16-901
LEL combustible NA NA 54-16-801
Carbon monoxide 54-16-01 54-16-010 54-16-011
Hydrogen sulfide 54-16-02 54-16-020 54-16-021
Sulfur dioxide 54-16-03 54-16-030 54-16-031
Chlorine 54-16-08 54-16-080 54-16-081
Phosphine 54-16-13 54-16-130 54-16-131
Nitrogen dioxide 54-16-09 54-16-090 54-16-091

Sperian Biosystems_54-16-081_ZoneGuard_with_Remote-Sensor

Biosystems 54-16-081 View of ZoneGuard with Remote Sensor

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


Return to Brandt Instruments
For more information  Email Mail
Brandt Instruments, Inc. 
    18568 Oak Grove Parkway 
    Prairieville, LA  70769 
Phone: 225-673-6776
    Fax: 225-673-6725

Visa, MC, AmEx, Discover Cards

Copyright © 2002-2018 Brandt Instruments, Inc.