26 • MRLDS-450 Refrigerant Gas Detection I&O Manual
026-1316 Rev 0
5
Care and Maintenance
5.1. Maintenance Intervals
Table 5-1
- Maintenance Intervals and Functions
Interval
Function
During Commissioning
Check calibration
Check LEDs for proper operation*
Check for proper buzzer and relay operation*
Check signal transmission to the BMS.BAS (central controller) if connected*
Every 6-12 Months**
Inspection by trained service personnel.
Check LEDs for proper operation*
Check for proper buzzer and relay operation*
Check signal transmission to the BMS/BAS (central controller) if connected*
Calibrate the sensor or contact Emerson Technical Support for sensor exchange
with factory - calibrated sensor
As Required
Replace sensor module(s)
* These can be activated via Modbus commands or via MRLDS-400 Series App.
** Typical maintenance frequency can vary by sensor type.
Table 5-2
- Maintenance Intervals and Functions
Sensor Type
Recommended Maintenance Interval
Typical Sensor Lifetime
Electrochemical*
12 months
2-3 years
Catalytic Bead
Zero calibration -1-3 months
Span calibration - 6 months
5-7 years
Semiconductor*
6 months after commissioning
12 months thereafter
4-6 years
Infrared
12 months
5-7 years
* Sensors should be checked after exposure to significant concentrations of gas, which can
shorten the sensor lifetime and/or reduce its sensitivity.
