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5
Care and Maintenance
5.1. Maintenance Intervals
Interval
During
Commissioning
Every 6-12 Months**
As Required
* These can be activated via Modbus commands or via MRLDS-400 Series App.
** Typical maintenance frequency can vary by sensor type.
Sensor Type
Electrochemical*
Catalytic Bead
Semiconductor*
Infrared
* Sensors should be checked after exposure to significant concentrations of gas, which can shorten the sensor
lifetime and/or reduce its sensitivity.
5.2. Adjustments
5.2.1. Introduction
Adjustment of the detector must be performed at regular intervals as required by national standards or
regulations (For example, EN 378, ASHRAE 15, BREEAM, etc.).
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*
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
Replace sensor module(s) As Required
Table 4-2 - Status Ring of Various Instrument States
Recommended Maintenance Interval
12 months
Zero calibration -1-3 months
Span calibration - 6 months
6 months after commissioning
12 months thereafter
12 months
Table 5-2 - Maintenance Intervals and Functions
Breathing Hazard: Calibration gas MUST NOT be inhaled! See appropriate Safety
Data Sheets. Calibration gas should be vented into a fume hood or to the outside
of the building.
Zero First, Then Span: For proper operation, never adjust the span before
completing a zero adjustment. Performing these operations out of order will
cause faulty calibration.
Function
Typical Sensor Lifetime
2-3 years
5-7 years
4-6 years
5-7 years
19
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