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All Categories > Gas Detection Instruments And Systems > Multipoint (3 or more points) Continuous Monitoring Systems > Four Point Monitoring Systems - PLC Series - Hydrogen > Item # SRPLC402-500m  

Item # SRPLC402-500m, Four Point Monitoring Systems - PLC Series - Hydrogen

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PLC Multipoint Monitoring Systems include:
  • Displays real time gas concentrations in ppm
  • Dedicated sensor, sample pump, and digital flow switch for each monitoring location
  • All control and display functions at easy-to-use operator interface
  • User adjustable, LO & HI alarm set points, activating dedicated relays for each monitoring location
  • Stackable tower lights for LO, HI, and fault alarms, and Piezo horn for HI alarm common to all channels
  • Alarm event and time tracking, last time calibrated tracking, specific for each sensor
  • Pump vacuum fault detection and fault display
  • System packaged in wall-mountable NEMA 12 enclosure
  • 4-20 mA output - dedicated for each point



± 2.0% of reading, ± 1 least significant digit. (Limited to accuracy of calibration standard)


± 0.5% of full scale

Minimum Detectability

1.0% of full scale


± 1.0% of full scale

Zero Drift

± 1.0% of full scale (24 hours)

Span Drift

Less than ± 2.0% of full scale (24 hours)


Against standard gas mixture, or via INTERSCAN's Electronic Calibration Service.

Lag Time

Less than 1 second


0-500 ppm


1 ppm


Hydrogen (H2)

Number of Detection Points




Includes Auto Zero



The zero and span drift specifications assume that the analyzer is equilibrated, and is at constant temperature, with a properly maintained sensor.


Gas Detection Applications Primer

Sensor Principle of Operation

Interfering Gas Data

H2 -Toxic and Hazardous Properties

Gas Detection Knowledge Base

Multipoint (3 or more points) System Instruction Manual
(PDF, 0KB)

How Do I Get Started?

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Interscan Video Library

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