System Description; Specifications - Honeywell EC-FX-NH3 Instruction And Installation Manual

System Description

Specifications

The EC-FX-NH3 leak detector is a three-wire 4/20 mA transmitter/sensor with
RS-485 Modbus RTU communication. It is designed for low-level ammonia
detection in industrial refrigeration, cold-storage environments, and engine
rooms.
The detector exhibits excellent durability and precision, with negligible
response to common interference gases and changes in relative humidity.
The default alarm level is 25 ppm for the 0-100 ppm sensor. The unit exhibits
extremely high reliability with no moving parts.
Monitoring equipment must be configured to indicate a fault if the signal is
less than 1.5 mA. All signals over 20 mA must be considered high gas
concentrations.
Method: Electrochemical (diffusion)
Ranges: 0-100 PPM
0-200 PPM
0-250 PPM
Output: Isolated 4/20 mA, 700 ohms max at 24 VDC. Signal output reduces
to 0.5 mA to indicate a fault condition.
RS-485 Protocol: MODBUS RTU
Accuracy: ±5% of full scale range at temperature of calibration. Contact
Honeywell Analytics for additional details.
Repeatability: <10% of full scale
Response Time (T ): <30 seconds, 90% full scale
90
Sensor Viability Test: An internal microprocessor determines the sensor's
electrical viability every 24 hours (SensorCheck
viability test fail, a 0.5 mA signal will indicate a fault.
A red LED on the circuit board will indicate if a sensor is degraded electrically,
depleted of electrolyte or disconnected.
4/20 mA Loop Viability Test: Internal monitoring of 4/20 mA output
impedance.
Operating Humidity: 5%-100% RH (condensing). ATMOS equipped®
enviro-adaptive technology option required for condensing conditions or
refrigerated areas, and all outdoor applications.
Operating Temperatures: -50
ATMOS equipped enviro-adaptive technology option required for
®
refrigerated areas or outdoors.
). Should the electrical
TM
o F to +120 o F (-45ºC to +50ºC).
OPERATOR MANUAL
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