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Model TS420
1.0 Introduction
1.1 General Description
The Model TS420 is a 4-20mA, loop-powered Oxygen Deficiency detector used for monitoring
Oxygen levels. The micro-processor based electronics process information at the sensor site
and are contained within a corrosion and solvent resistant plastic housing. An LCD display
provides status indications that can be viewed through a window in the housing. The analog
signal (0 to 25% V/V O
2
full scale) provides remote and/or discrete indications of the sensor’s
operation.
The TS420 is entity-approved as intrinsically safe for use in Class I, Divisions 1 & 2, Groups A,
B, C and D, Class II, Groups E, F and G & Class III hazardous areas. It can also be used in
general-purpose (non-hazardous) applications.
NOTE - Intrinsically safe applications require an I/S barrier mounted in a safe area. See
Section 3.3.1 for guidelines.
1.2 Features and Benefits
Microprocessor-Based Electronics: monitors for fault conditions, processes input signals
from the sensor and provides outputs in the form of display codes and an analog signal.
One Person Adjustment-Free Calibration: initiate the calibration sequence with a magnet,
apply 20.9% V/V O
2
, and wait for the display to indicate that the unit has completed the
calibration. No user adjustments are required.
Two Segment LCD: indicates gas presence, operational modes, fault codes and calibration
cues.
4 to 20 mA Output: transmits fault, calibration, and gas concentration levels to a remote
display, computer or other device.
1.3 Applications
This is a partial listing of applications.
! Wastewater Treatment Plants
! Chemical and Petrochemical Plants
! Refineries
! Pulp & Paper Plants
! Micro-chip Manufacturing
! Pharmaceuticals
! Food & Beverage
! Utilities
Figure 1 Model TS420