Operation; Start-Up Procedures; Simple Start-Up Test; Pushbutton Operation And Led Indicators - Honeywell EC-FX-NH3 Instruction And Installation Manual

Operation

A

Simple Start-Up Test:

B

Start-up Procedures

Before applying power, make a final check of all wiring for continuity, shorts,
grounds, etc. It is usually best to disconnect external alarms and other
equipment from the sensor until the initial start-up procedures are
completed. SensorCheck
After power-up, allow 24 hours for the system to stabilize before testing the
sensors. As sensors are typically located a distance from the controller or PLC,
Honeywell Analytics recommends that the mA signal be calibrated with the control
system.
• One person exposes each sensor to a small amount of ammonia.
• The second person stays at the control unit to determine that each sensor,
when exposed to the gas fumes, is connected to the proper input and
responds, causing appropriate alarm functions.

Pushbutton Operation and LED Indicators

The EC-FX-NH3 has an internal pushbutton that is utilized for navigation of test
functions and operating modes (see Figure 5, Note 5). It also has a group of LEDs
(green, red, yellow — see Figure 3 on page 15) that blink in specific sequences to
indicate sensor operation modes. A summary of sensor operation modes and
corresponding LED blink sequences is shown in Figure 6. The pushbutton must
be pressed the correct number of times and at the correct rate.
When a multi-press sequence must be performed, the button
must be pressed rapidly and evenly, lifting one's finger completely
from the actuator for each consecutive press.
• For press and hold activations, one's finger must always be applying
a down pressure without disruption for the specified time in order to
activate the desired mode.
• See complete details of each operation in other parts of
the manual.
The EC-FX-NH3 has been designed with three distinct test mode procedures that
are triggered by the appropriate push button action. These test modes include
Manual SensorCheck , Simple Zero Test, and 4/20 mA Loop Check.
TM
The fourth operation puts the unit into Calibration Mode to allow for testing
with a certified calibration gas standard and to provide information for
appropriate span adjustments, if required.
TM
is initiated each time the unit is powered up.
OPERATOR MANUAL
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