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Model TS420
Quick Start Guide
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(GREEN/YELLOW)
FRAME GROUND
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Ø1.75"
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4.50"
3/4 NPT
1 1/2-20 UN-2
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1. Mount and Wire the Detector (pages 5 through 9)
There are no standard rules for detector placement since the optimum sensor location is
different for each application. The customer must evaluate conditions at the facility to make this
determination. Generally, the TS420 should be easily accessible for calibration checks. The
TS420 should be mounted pointing down to prevent water build-up on the detector head. The
detector assembly should not be placed where it may be coated by contaminating substances.
Although the Model TS420 is RFI resistant, it should not be mounted in close proximity to radio
transmitters or similar equipment.
Some general guidelines for sensor location:
! The TS420 should be used in locations that are tightly enclosed with poor or no
ventilation, such as utility tunnels or underground storage areas. These areas are likely
to have dangerously low oxygen concentrations.
! Observe the TS420’s environmental specifications when locating the unit.
The environmental specifications covering the electrochemical cell are found in the Appendix,
Section 5.1.4.
Detectors should be mounted in an area that is as free from wind, dust, water, shock and
vibration as possible.
WARNING - Operation above or below temperature limits will provide unstable readings, which
may cause false alarms or failure to alarm. See Section 5.1.4 for guidelines.
General Monitors discourages painting of detector assemblies. If the detector head is painted
over, the gas will not be able to diffuse into the sensor. If the TS420 body is painted over, the
LCD display cannot be read.
The TS420 is shipped without the sensor installed. The sensor must be installed into the
detector and calibrated for proper operation. See Sections 3.3 and 3.4 for installation
instructions and Section 4.3 for calibration instructions.
Once correctly installed, the TS420 requires little or no maintenance other than periodic
calibration checks to ensure system integrity. General Monitors recommends a calibration
check schedule be established and that the complete system, including all alarm circuitry, be
tested at least annually.
The overall and mounting dimensions for the TS420 (Figure Q-A) should be used when making
installation determinations. Mechanical specifications can be found in the Appendix, Section
5.1.2.
Figure Q-A Outline and Dimensional Drawing