E2648-NH3-E
Rev 22.06.2021
Operation
Turn on the power. The instrument warm-up time takes about 1 minute after switching on
and the final sensor stabilization time to maximum accuracy takes about 30 minutes. The
operating status is indicated by the LED on the PCB of the device. The control LED (red)
response to different processes is presented in the following table:
Mode
LED mode
During calibration mode or sensor heating
period (if activated)
0.5 Hz (50% on, 50% off)
Relay 1 turned on
Blinking 1 Hz (50% on, 50% off)
Relay 2 turned on
Blinking 2 Hz (50% on, 50% off)
During the Modbus communication cycle
Short on-off pulses
Normal operating/measurement
Continuously on or off
Make sure that the transmitter is properly mounted, the external devices connected, the
power LED (green) on, and the control LED (red) is constantly lit. Make certain that the
cable glands are properly tightened to ensure the conformity to IP66 protection class.
Place the lid back and fix it with the screws. The device is ready to use.
Maintenance
Do not perform any maintenance operation with the power on.
Clean the device with a soft damp cloth. Do not use any abrasive cleaning agents. Do not
immerse the device in water or any cleaning media.
Calibration
E2648-NH3-E detectors have been calibrated by the Manufacturer with standard gas
mixtures before delivery. Provided that the sensor is used under moderate conditions, field
recalibration is recommended every 6 months. Please contact your dealer for more
information.
13
