Electrochemical Ammonia (NH3) Leak Detector
EC-FX-NH3
Instruction and Installation Manual
Part No. 1998M0872
Revision 1
June 2014
Honeywell Confidential & Proprietary This work contains valuable, confidential, and proprietary information.
Disclosure, use or reproduction outside of Honeywell Inc. is prohibited except as authorized in writing. This
unpublished work is protected by the laws of the United States and other countries.
OPERATOR M ANU AL
Table of Contents
Table of Contents ................................................................................................. 1
Figures ................................................................................................................. 2
Notices and Trademarks
Contact Us
............................................................................................................ 4
Online
..................................................................................................... 4
Telephone
.................................................................................................. 4
...................................................................................... 3
Symbol Definitions ................................................................................................ 5
Introduction .......................................................................................................... 6
System Description ............................................................................................... 7
Specifications ............................................................................................ 7
Installation ............................................................................................................ 9
A Locating the EC-FX
-NH3 Sensor
...................................................... 9
B Wiring ........................................................................................... 11
Outputs: ...................................................................................... 13
Cable Recommendation: .............................................................. 14
Operation ........................................................................................................... 16
A Start-up Procedures ..................................................................... 16
Simple Start-Up Test: .................................................................... 16
B Pushbutton Operation and LED Indicators .................................... 16
Green LED ................................................................................... 17
Red LED ...................................................................................... 17
Yellow LED .................................................................................. 17
Green — ON, Red — Fast Blink, Yellow — Fast Blink ................... 18
SensorCheckTM ............................................................................ 20
4/20 mA Loop Test ....................................................................... 21
Simple Zero Test .......................................................................... 22
Span Calibration Mode ................................................................. 22
Span Calibration .......................................................................... 23
Span Signal Formula ................................................................... 25
MODBUS Address Change ............................................................. 26
C
Troubleshooting
............................................................................. 28
D Maintenance ................................................................................ 31
EC Sensor Replacement Procedure ............................................... 32
Replacement Parts ........................................................................ 32
Limited Warranty ................................................................................................ 33
Limited Warranty ...................................................................................... 33
Exclusions .............................................................................................. 33
Warranty Limitation and Exclusion ............................................................ 33
Disclaimer of Unstated Warranties............................................................ 33
Limitation of Liability ................................................................................ 34
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Figures
Figure 1. Mounting Dimensions ............................................................... 10
Figure 2. 4/20 mA Output Wiring Diagram ................................................ 13
Figure 3. RS-485 Communication and Power Wiring Diagram................... 15
Figure 4. LED Blink Sequence ................................................................. 17
Figure 5. EC-FX-NH3 Detector Components ............................................ 18
Figure 6. LED Sequence Indicator and Operation Summary ...................... 19
Figure 7. LCD Module.............................................................................. 27
Figure 8. Troubleshooting ....................................................................... 30
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Notices and Trademarks
© 2014 by Honeywell International Inc.
While this information is presented in good faith and believed to be accurate, Honeywell
disclaims the implied
and makes no express warranties except as may
and for its customers.
warranties of merchantability and fitness for a particular purpose
be stated in its written agreement with
In no event is Honeywell liable to anyone for any indirect, special or consequential
damages. The information and specifications in this document are subject to
change without notice.
Manning is a registered trademark of Honeywell International Inc.
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Contact Us
Online
Telephone
Honeywell Organization WWW Address (URL)
Corporate www.honeywell.com
Honeywell Analytics www.honeywellanalytics.com
To return a product, contact haservice.canada@honeywell.com to obtain
an RMA number.
For sales Information, contact detectgas@honeywell.com.
Contact us by telephone at the numbers listed below.
Organization Phone Number
1-800-538-0363
1-847-955-8200
1- 800-663-4164
1- 800-563-2967
+82 2 6909 0321
+41 (0)44 943 4300
Americas
Asia Pacific
Europe/Middle
East/Africa
Honeywell Analytics Inc.
Lincolnshire, IL
BW Technologies by Honeywell
Calgary, Alberta, Canada
Honeywell Analytics Inc.
Brossard, Quebec, Canada
Honeywell Asia Pacific Inc.
Seoul, Korea
Life Safety Distribution AG
Hegnau, Switzerland
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Symbol Definitions
The following table lists those symbols used in this document to denote certain
conditions.
Symbol Definition
ATTENTION: Identifies information that requires
special consideration.
TIP: Identifies advice or hints for the user, often
in terms of performing a task.
REFERENCE-EXTERNAL: Identifies an
additional source of information outside of this
bookset.
REFERENCE-INTERNAL: Identifies an
additional source of information within this
bookset.
Indicates a situation which, if not avoided, may
result in equipment or work (data) on the system
being damaged or lost, or may result in the
inability to properly operate the process.
CAUTION: Indicates a potentially hazardous
situation which, if not avoided, may result in
minor or moderate injury. It may also be used to
alert against unsafe practices.
CAUTION: Symbol on the equipment refers the
user to the product manual for additional
information. The symbol appears next to
required information in the manual.
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Introduction
This manual has been prepared to help in the use and installation of the EC-FX-
(Electrochemical-Ammonia) Sensor. This manual will convey the operating
NH3
principles of the sensor, ensure proper installation, and
demonstrate start-up and
routine maintenance procedures for the sensor.
ATTENTION: This manual must be carefully followed by all
individuals who have or will have the responsibility for using or
servicing the sensor.
Warranties made by Honeywell Analytics with respect to this equipment will
be voided if the equipment is not used and serviced in accordance with the
instructions in this
manual. If in doubt about a procedure, please contact
Honeywell Analytics before proceeding.
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System Description
The EC-FX-NH3 leak detector is a three-wire 4/20 mA transmitter/sensor with
RS-485 Modbus RTU
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
extremely high reliability with no moving parts.
communication. It is designed for low-level ammonia
-
100 ppm sensor. The unit exhibits
Monitoring equipment must be configured to indicate
less than 1.5 mA. All signals over 20 mA must be considered high gas
concentrations.
Specifications
Method: Electrochemical (diffusion)
Ranges:
0-200 PPM
0-250 PPM
Output: Isolated 4/20 mA, 700 ohms max at 24
to 0.5 mA to indicate a
RS-485 Protocol:
Accuracy: ±5% of full scale range at temperature of calibration. Contact
Honeywell Analytics for additional details.
Repeatability: <10% of full scale
Response Time (T
Sensor Viability Test: An internal microprocessor
electrical viability every 24
viability
0-100 PPM
VDC. Signal output reduces
fault condition.
MODBUS RTU
): <30 seconds, 90% full scale
90
hours (SensorCheckTM). Should the electrical
test fail, a 0.5 mA signal will indicate a fault.
a fault if the signal is
determines the sensor’s
A red LED on the circuit board will indicate if a sensor is degraded electrically,
depleted of electrolyte or
4/20 mA Loop Viability Test: Internal monitoring of
disconnected.
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:
-50oF to +120oF (-45ºC to +50ºC).
ATMOS® equipped enviro-adaptive technology option required for
refrigerated areas or outdoors.
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Sensor Pressure Limits: Atmospheric ±10%
Power Source: 24 VDC (recommended), 0.5 amp max. 14-26 VDC
acceptable.
Cable Recommendations:
4/20 output: #18/3 shielded cable (Belden #8770 or
runs <1,500 feet.
Modbus RTU (RS-485): For communication cable,
twisted pair, shielded (Belden #9841 or
2,000 feet.
Power Cable Recommendations:
For power cable,
use 14 AWG (Belden #5100UE or equal), cable runs
up to 1,000 feet, for each power supply. Larger power cable and/or
additional power supplies may be
and/or increased
sensor
current draw, line loss, and cable size, contact Honeywell
number of sensors. Due to variables such as
required for longer cable runs
Analytics for help with power requirements.
Gas Sampling: Diffusion method is standard.
Enclosure: NEMA 1, gasketed, #16-gauge steel
models are available.
NOTE: The EC-FX is for use in non-classified areas only.
equal), cable
use 24 AWG
equal), cable runs up to
(standard) or stainless steel
Weight: 3 lbs.
Dimensions: 6" high x 4" wide x 3.5" deep
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Installation
A Locating the EC-FX
Because each sensor is a point measurement, it is very important that the
sensor be located properly.
One of the most important considerations when installing EC
sensors is that they must be easily accessible for calibration and
maintenance. As a general rule, locate sensors no closer than one
foot from the ceiling.
If the primary application is personal protection
concentration reading that an
sensor at
be about five feet off the ground, which also allows easy access.
If the primary application is the fastest possible leak
sensor near the potential leak
usually near
refrigeration applications, ammonia vapors from an NH
low elevation. In
mounted at high elevation and the indicated
representative of personnel
complicate access to the sensor for required calibration and maintenance.
For more information on
scenarios,
a height in the breathing zone of the employees. It would typically
the ceiling as ammonia vapor is lighter than air. In certain
these cases, leak detection will take longer if the sensor is
please contact Honeywell Analytics.
-NH3 Sensor
employee would be exposed to), mount the
sources. In the case of ammonia, this is
exposure. Higher mounting locations can also
sensor mounting locations for different leak
(representative
detection, mount the
leak will remain at a
3
concentration will not be
General Mounting Considerations:
• Should be easily accessible for calibration and maintenance.
• Mount the sensor close to a potential leak source.
• If personnel protection is the primary application, mount in the
“breathing zone”.
• Protect sensor from water, excessive humidity, and wash-down.
• Take air movement and ventilation patterns into account.
• If mounting sensor outdoors, consider prevailing wind direction and
proximity to the most likely source of leaks. Protect the sensor from
sun and rain as much as possible.
• Never mount the sensor in CA (controlled atmosphere) rooms because
normal atmospheric level of oxygen is required for operation.
• For highly critical locations, more than one sensor should be installed
in each room.
• To prevent electrical interference, keep sensor and wire runs away
from mercury vapor lights, variable speed drives, and radio repeaters.
• Protect sensor from physical damage (fork lifts, etc.).
• Do not mount the sensor over a door in a refrigerated area.
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Figure 1. Mounting Dimensions
• Sensor must be mounted vertically.
• Never mount flat on a ceiling.
• Enter enclosure only through existing hole in bottom.
• Always make a drip loop in the conduit (see Figure 1).
Blast Freezers: Never mount sensor above the coil. The ideal location,
when possible, is below the
protect
the unit from being damaged by product loading and unloading.
Keep it away from warm, moist air during
the ground is the
best location.
Penthouses:
• Multi-Coil (defrost one coil at a time): In this case the
usually in the center of the penthouse
grate.
• Single Coil (or when all coils defrost at the same time):
high moisture conditions can occur and
mounted one foot above the
Engine Rooms: The sensor should be
possible. Keep the sensor away from hot air exhausting from electric
or other machinery. Usually the best location is four or five feet above the
floor in a location where
from the potential leak source.
bottom of the coil. Try to put in return air and
defrost. Usually four or five feet off
best location is
four or five feet above the
In this case
the sensor should be
grate.
mounted in a cool part of the room, if
motors
the room exhaust fan will move air across the sensor
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Ceiling-Hung Evaporators: When mounting Manning EC sensors near
evaporators, mount the
sensor no higher than two feet below the top of the
evaporator coil. DO NOT mount in high air flow (1,200 feet/ minute
maximum). NEVER mount the
damage the
sensor.
sensor on evaporators as vibration can
Other Locations: When mounting Sensors in locations such as roof top air
units, duct-
work, attic spaces, makeup air intakes, etc., contact Honeywell
Analytics for application assistance and recommendations.
B Wiring
Figure 2 on page 13 presents 4/20 mA output wiring information for the ECFX-NH
information for the
sensor. Figure 3 on page 15 presents RS-485 communication wiring
3
EC-FX-NH3 sensor.
Electrical wiring must comply with all applicable
may be involved and
operating conditions should be discussed with local
codes. Plant equipment that
operating personnel to determine if any special needs should be taken into
account.
Almost all start-up problems are due to improper wiring or monitor
configuration. Please follow these
guidelines carefully.
Do not pull sensor wiring with AC power cables. This will cause electrical
interference. Be sure there are no breaks or splices in sensor wiring runs.
If cable runs cannot be made without a splice, all connections must be
soldered. Soldering should be done using a rosin flux to tie the connecting
ends of sensor wires to ensure a positive and long-lasting contact.
Ground the shield at the main control panel. Connect the shield wire in the
sensor terminal block labeled
sensor to
insulate it from the enclosure.
All penetrations into a refrigerated room should be
condensate from forming in the
enclosure.
Make drip loops for cables going into sensor
enclosures are used, follow
enclosure
(…This End Up).
SHLD. Tape all exposed shield wire at the
sealed to prevent
conduit and dripping into the sensor
housings. When heated
the special mounting instructions on the
Mount sensor enclosures through the flange holes as shown in
Figure 1, and always mount vertically
4/20 mA output: Always use three conductor,
copper cable.
11
.
insulated, stranded, shielded
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RS-485 output: Always use two conductor twisted pair, insulated, stranded,
shielded copper cable for
the communication cable. Use two conductor,
insulated, stranded cable for sensor power.
With RS-485, the communication cabling of the
multiple devices
pair of wires. If used with the AirAlert
(sensors, relay modules, etc.) communicating along the same
TM
96d controller, up to 32 devices can be
network is “daisy chained”, with
wired in series per channel (up to three channels).
Refer to the controller manual for specific wiring details.
When many sensors are connected to one set of power cables, total
current draw may
considerable line-loss. Contact Honeywell Analytics for
recommendations on power cable sizing and
supplies.
exceed cable recommendations and/or cause
additional power
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Figure 2. 4/20 mA Output Wiring Diagram
Outputs:
Electrical Power: 24 VDC regulated, 30 mA. With
enclosure the current draw is
400 mA max.
Respect minimum voltage requirements.
ATTENTION: The EC-FX-NH3 detector is
ohm, 1/4 watt resistor in the green, four position terminal block,
across the
resistor is needed to “fake out” the 4/20 mA loop if using the
Signal and Ground terminals (see Figure 3). This
Modbus RTU output. Only remove this
output.
• 4/20 mA: Circuit board mounted sensor provides a
output. Monitoring equipment may
have a maximum input
impedance of 700 ohms.
an ATMOS® equipped
shipped with a 100
resistor if using the 4/20 mA
linear 4/20 mA
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• RS-485: MODBUS RTU communication protocol.
Cable Recommendation:
• 4/20 mA output: Use #18/3 shielded cable (Belden #8770 or
equivalent). Length of cable to sensor
should be no greater than
1,500 feet.
• RS-485 output: For communication cable, use 24 AWG
twisted pair,
shielded (Belden #9841 or equal), cable runs up to 2,000 feet. Avoid
“T-taps” if possible. Do
130 feet
total of all T-taps (per channel). For power cable, use 14
AWG (Belden #5100UE or equal), cable runs up
not exceed 65 feet per T-tap. Do not exceed
to 1,000 feet, for
each power supply. Larger power cable and/or additional power
supplies may be
required for longer cable runs and/or increased
number of sensors. Due to variables such as sensor current draw,
line loss, and cable size, contact Honeywell Analytics for help with
power cable
requirements.
Monitoring: The EC-FX-NH3
JR, AirAlert
TM
96d, or other appropriately configured system. For 4/20 output,
ammonia detector may be monitored by the GM-
monitoring equipment must be configured to indicate a fault if the signal is
below 1.5 mA. All signals over
20 mA must be considered a high gas
concentration, not a fault condition.
NOTE for PLC applications: The signal output load can range
from 0 to 700 ohms, where the maximum load resistor at a 24 VDC
supply
supply is 267 ohms. Any load outside these
fast flash on the red LED while
normal
signal output cannot source the necessary
is 700 ohms and the maximum load resistor at a 10 VDC
values will indicate a
in operation or this test mode during
operation. The error LED will blink fast at any time if the
current.
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Figure 3. RS-485 Communication and Power Wiring Diagram
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• See complete details of each operation in other parts of
Operation
A 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
TM
is initiated each time the unit is powered up.
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.
Simple Start-Up Test:
• One person exposes each sensor to a small amount of ammonia.
• The second person stays at the control unit to
when exposed to
responds, causing appropriate alarm
the gas fumes, is connected to the proper input and
functions.
B Pushbutton Operation and LED Indicators
The EC-FX-NH3 has an internal pushbutton that is utilized for navigation of test
functions and
(green, red, yellow
indicate sensor
corresponding LED blink sequences is
be pressed
operating modes (see Figure 5, Note 5). It also has a group of LEDs
—
see Figure 3 on page 15) that blink in specific sequences to
operation modes. A summary of sensor operation modes and
shown in Figure 6. The pushbutton must
the correct number of times and at the correct rate.
When a multi-press sequence must be performed, the button
must be pressed rapidly
the actuator for each consecutive press.
from
and evenly, lifting one’s finger completely
determine that each sensor,
• For press and hold activations, one’s finger must always be applying
a down pressure
activate the desired mode.
the manual.
The EC-FX-NH3 has been designed with three distinct test mode procedures that
triggered by the appropriate push button action. These test modes include
are
Manual SensorCheck
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.
16
without disruption for the specified time in order to
TM
, Simple Zero Test, and 4/20 mA Loop Check.
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Figure 4. LED Blink Sequence
Green LED
Solid ON — all modes except Cal. and 4/20 mA calibration.
Slow Blink — Calibration mode.
Red LED
Solid ON — Possible catastrophic failure on the circuit board. The 4/20 mA
signal will vary depending on the exact failure. In the event of corrupted
data, calibration values and Modbus ID may be lost but the gas sensor and
4/20 mA output circuit would still be operational. In the event of a CPU
failure, a 0.5 mA fault signal is output from the sensor. All other functions
and devices would be inoperable (optional LCD, network, pushbuttons,
etc.). Contact Honeywell Analytics for technical support.
SLOW BLINK
MEDIUM BLINK
FAST BLINK
CONTINUOUS ON
Slow Blink — Near death, possible dried up or disconnected sensor. A
0.5 mA fault signal is output from the sensor during this error event. A
replacement sensor should be ordered at this time.
Medium Double Blink — Possible weak sensor. Sensor is nearing the end
of its useful life. Although the sensor may pass the span calibration or
detect the presence of ammonia, frequent attention and increased
calibration checks are strongly recommended until the sensor is replaced.
Fast Blink — Possible 4/20 mA loop failure or load resistance too high.
Check output impedance and ensure it is between 10Ω and 700Ω
referenced to ground. In addition, ensure power supply voltage is within
specified operating range.
Yellow LED
Solid ON — During Sensor CheckTM.
Medium Double Blink — During 4/20 mA (0.5 mA low) test.
Fast Blink — During 4/20 mA (22 mA high) test and during failed (22 mA
high) test.
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Green — ON, Red — Fast Blink, Yellow — Fast Blink
4/20 mA loop test failed the 22 mA high extremity. Check output impedance
and ensure
ensure power supply
it is between 10Ω and 700Ω referenced to ground. In addition,
voltage is within specified operating range.
Figure 5. EC-FX-NH3
Detector Components
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Figure 6. LED Sequence Indicator and Operation Summary
Mode Green LED (Left) Red LED (Center) Yellow LED (Right) Note
Normal Run
Mode
During Span
Calibration
Mode
During Simple
Zero Test
Manual
SensorCheckTM
Weak Sensor
Failed or
Disconnected
Sensor
Hardware
failure
During 4/20 mA
Loop Test
(22 mA high)
Failed Loop
Test (22 mA
high)
During 4/20 mA
LoopTest
(0.5 mA low)
Failed Signal
Output
3
1
2
2
4
NOTES:
1. SensorCheck™ automatically every 24 hours. Manual test can be initiated.
2. Unit will output 0.5 mA.
3. Exits mode after 10 minutes or if pushbutton is pressed for one second.
4. Occurs due to wiring problem or incorrect load value.
= Initiated by button press.
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SensorCheckTM
SensorCheckTM is a microprocessor-based technology that monitors and
predicts the electrical viability of its
sensors by
testing every 24 hours. If the sensor becomes depleted or is
disconnected, SensorCheckTM sends an indication that can be detected by a
gas detector or PLC.
electrochemical and infrared ammonia
The red LED will indicate if a sensor starts to degrade
electrically causing
marginal operation requiring frequent attention and increased calibration checks.
Should the electrical viability test fail, the unit outputs a 0.5 mA signal to indicate
this fault condition.
TM
The SensorCheck
replace adherence to the factory-recommended calibration schedule.
SensorCheck
verifying physical aspects such as
by dirt, flour,
TM
grease, water, paint, etc.
electrical viability test is not, however, meant to
is an internal electrical test that is not capable of
blockage of the sensor membrane
Physical blockage is rare, but does occasionally happen, especially in many
harsh processing
NOTE: SensorCheck
viability of a sensor operating in high or continuous concentration of NH
Although SensorCheck
time a manual sensor check
To perform a manual SensorCheck
Start: Press button (see Figure 4, Note 5) three
(test takes about 15 seconds). During test, green and yellow LED’s are
environments.
TM
is not intended to measure or indicate the chemical
TM
is performed automatically every 24 hours, at any
can be performed.
TM
, follow the procedure below:
times within two second time limit
both
.
3
continuous ON.
Continuous ON
Continuous ON
Exit: Unit resumes normal mode automatically after about 20 seconds.
Green LED remains continuous ON and yellow LED is unlit.
20
LED is OFF
Continuous ON
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4/20 mA Loop Test
NOTE: This test is recommended especially for PLC operations (non-
Honeywell readout/alarm unit).
NOTE: This test will not automatically time out. You
must force the unit into
normal operation.
• Full Scale Test: This test will verify that the full-scale output of the
sensor is also achieved at the PLC.
Start: Place meter leads on Test (+) and Test (—).
two- or three-second
period of time. The voltmeter should read approximately 220
Press button five times within a
mV (equal to 22.0 mA output). Verify full-scale signal at PLC. NOTE: some PLCs
limit input to 20 mA. Blink sequence will be:
Continuous ON
Fast blink
• Signal Fault Test: This test will simulate one of many
conditions in which the transmitter will
panel. To check for
one
second (voltmeter should read approximately 5 mV (equal to
downscale fault verification, press button for
0.5 mA output). Verify downscale fault
send 0.5 mA to the control
indication at PLC. Blink
sensor fault
sequence will be:
Continuous ON
Medium blink
PLC and monitoring equipment should indicate Fault at this extremely
low signal output, (i.e., Honeywell Analytics recommends fault
indication on any signal below 1.5 mA.)
Exit: Press and hold button for one second. Sensor
will exit test and return to
normal operation.
Continuous ON
NOTE: This test will not automatically time out. You must force the unit into
normal operation.
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Simple Zero Test
Start: With meter set to mVDC, place leads on Test (+) and Test (—) (see
Figure 4, Note 3). Press
Mode.
• Unplug the sensor from the pre-amp.
• Observe the 4/20 mA signal which should be
(40 mV on meter). Range
is
not in this range, contact Honeywell Analytics.
• Plug sensor back into pre-amp. Wait for sensor to
approximately 4.0 mA.
and hold button for one second to enter the Calibration
Slow blink
approximately 4.0 mA
should be 39.4 to 40.6 mV. If sensor output
stabilize at
Exit: Press and hold button for one second (places
Mode).
PLC and monitoring equipment should indicate Fault
extremely low signal output, (i.e., Honeywell
recommends fault indication on any signal below 1.5 mA.)
Exit: Press and hold button for one second. Sensor
normal operation. Blink
Span Calibration Mode
unit in Normal Operation
Continuous ON
at this
Analytics
will exit test and return to
sequence will be:
Continuous ON
NOTE: If using the Modbus RTU output with
the AirAlert
TM
96d
controller, while in calibration mode, alarms A, B, and C will not be
activated during calibration of the sensor.
NOTE: When replacing an aged or non-
responsive sensor,
the new sensor may cause an erratic or jumpy signal,
sometimes causing false
alarms. This is usually caused by
excessive gain leftover from adjusting the span pot (increasing
sensitivity) for the old sensor. Once the span calibration is
the
performed on the new sensor, the gain will be
decreased to
match the sensitivity of the new sensor, reducing the
jumpiness of the new sensor.
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The EC-FX-NH3 detector
calibrated at start-up. The sensor performs best when calibrated in the
environment in which it will be used.
recommended full scale will affect the stated accuracy. One pot on the
preamp is used for Span calibration (see Figure 4, Note 1). There is no
zero pot as the pre-amp is factory zeroed and should not require any
further
Calibration Kits are available from Honeywell
part numbers and descriptions. Calibration gas must be ordered separately;
refer to the Refrigeration Price Book for ranges and prices.
Span Calibration
The unit is factory calibrated but must be spanned at initial installation. Do
adjust the span pot without certified calibration gas.
not
For span calibration, follow this procedure:
Start:
1.
2. Make sure signal is resting at 4.0 mV ±5 mV. If the sensor
3. Place the unit in calibration mode by pressing the button for 3
is factory calibrated but it must also be
Using calibration gas other than the
adjustment.
Analytics. See page 32 for kit
With meter set to mVDC, place leads on Test (+) and Test (-).
is not
outputting 4.0 mA, see Troubleshooting on page 27. In some cases,
opening doors changes the temperature, environment, and ambient
air flow to the sensor which impacts its stability during this
procedure.
seconds until the green LED flashes slowly or, for units equipped
with the LCD option, initiate the calibration mode using the front
panel push buttons.
NOTE: After 10 minutes, the unit will automatically revert to
run mode.
Slow
blink
NOTE: Keep hands away from the sensor in order for a
stable output to be achieved, as moisture and air flow can
affect stability.
4. Place the EC-FX calibration adaptor (EC-FX-CA) on the sensor and
ensure that it is fully-seated and aligned. Gas with full-scale span gas
mixed in air @ 0.3 L/min until the 4-20 mA output signal rise
NH
3
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OPERATOR M ANU AL
the 2 minute time period, this mode can be exited at any time
appears to slow down to around 0.1 mA/sec. If the output signal rises
above 20 mA, immediately begin adjusting the span pot counterclockwise to lower the mA output signal as the maximum output is 26
mA. The rise in 4-20 mA output signal will begin to slow down around 10
to 30 seconds after gas is applied as it begins to approach a peak value.
Turn the span pot until output reaches 20 mA ±0.5 mA (200 mV ± 5 mV)
even though the signal may be slowly changing. Remove the calibration
adaptor and shut off the gas. Do not gas the sensor for more than 2.5
minutes. If the mA output signal begins to drop quickly during the
gassing phase, (0.2 mA/sec.) too much gassing time has passed and the
process must be repeated.
Cal gas flow must be in the direction of the arrow shown on the EC-FX
calibration adaptor. Connect the regulator hose to the “Inlet port” side of
the adaptor according to the air flow direction arrow molded into the
plastic housing.
(Inlet side) ○→○ (Exit port side).
NOTE: The rise in 4-20 mA output signal will typically begin
to slow down around 30 seconds after gas is applied as it
approaches a peak value. If the 4-20 mA signal peaks then
begins to drop, quickly adjust the span pot to 20 mA±0.5 mA.
Do not gas for more than 2.5 minutes. If a signal peak is not
reached within 2 minutes, the sensor may need additional
time to stabilize, the adaptor may not be properly seated on
the sensor with the O-ring, or there may be other issues
specific to the site or the application.
NOTE: In some cases, the signal may begin to drop quickly
after it peaks, adjust the span pot until the output reaches 20
mA ±0.5 mA even though the signal may begin to drop slowly.
NOTE: For an EC-FX-NH3 detector with the LCD option,
once cal mode is initiated, “Apply gas” will show on the
display. For best accuracy, the span pot should be adjusted
during the 2 minute timer. Begin adjusting the span pot when
the NH3 reading begins to slow down to 0.1mA/sec
(1mV/sec). This will likely take place before the 2 minute timer
will expire. Use a meter as described on page 21 for mA
output readings during calibration, not ppm levels as shown
on the LCD display. Once cal gas begins to flow, a 2 minute
reference timer will indicate when the sensor has reached the
maximum allowed gassing time. If the signal has not peaked
or slowed down to 0.1 mA/sec. within this time, the sensor
may need additional time to stabilize or there may be other
issues per note above. After 2 minutes of gassing has
occurred, the display will indicate “Spansnsr”. If the sensor is
not ready to span or peaked in signal level when the
“Spansnsr” is shown on the display, the sensor may need
additional time to stabilize or the adaptor may not be properly
seated on the sensor. If the sensor was able to span within
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OPERATOR M ANU AL
by pressing the “scroll” then “accept” button.
5. Remove the calibration adaptor and shut off the gas.
6. Ensure that the output decreases to a stable 4 mA ±0.2 mA, this should
take about 5 to 15 minutes.
NOTE: If the output doesn’t decline to 4mA ±0.2 mA, an
internal offset procedure may be necessary. This procedure
can be found in the troubleshooting section of this manual
Press the button for 2 seconds to place the unit back into run mode. The
green LED will glow steadily, or for units the LCD option, exit from
calibration mode using the front panel push buttons. Exit: Press and hold
the button for one or two seconds.
normal operation.
(see page 27). In addition, if low level signals appear to be
surfacing occasionally slightly above 4mA, the internal offset
setting may be the issue, especially for differences in gain
settings that have occurred over time.
The green (left) LED on continuously =
NOTE: The Span Calibration Mode will automatically time out after 10 minutes.
Span Signal Formula
Normal span gas is full scale. To achieve maximum accuracy, full-scale
span gas must be used. If the span gas is not full scale, use this formula:
Signal (mA
Where:
ASGC = Available Span Gas Concentration
SFSV = Sensor Full Scale Concentration Value
Example: If 100 ppm ASGC gas is used to calibrate a 250 ppm SFSV sensor,
the signal would be as
Signal =
A S G C
)
=
S F S V
100 ppm
250 ppm
x 16 + 4
follows:
X 16 + 4 = 10.4 mA
Continuous ON
10.4 mA = 104 mV from TEST (—) to TEST (+)
If the correct output cannot be achieved, a replacement sensor may be
required.
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MODBUS Address Change
NOTE: To view or change the Modbus address, the Manning
LCD Module is required. Contact Honeywell Analytics to
obtain the
module.
NOTE: No two devices on the network can
address. Each device needs to have a unique address.
have the same
Each device requires an address to communicate with the controller on the
network. The Modbus address normally comes factory programmed and
does not require to be programmed at startup. If it is determined that the
Modbus address needs to be using the LCD module to view or change the
Modbus address: The LCD module has two push-buttons; Accept and Scroll,
which will be utilized for
this procedure (see Figure 7).
NOTE: To display the Modbus address, press the Scroll button anytime
during normal operating mode.
1. Plug in the LCD module to the LCD port on the
PCB (see Figure 7 on
page 26).
2. This module will power-up immediately and will
display the normal
(idle) operating display.
3. Press the Accept button.
4. You will then be prompted for a password. The
5. Use the Scroll button to change the first letter to M. Then press the
Accept button.
password is MA.
6. You will then be prompted to change the second letter. If it is already
set to A, press the
Accept button.
7. If the correct password is entered, you will be sent to the MAIN MENU.
8. In the MAIN MENU, scroll until the ModbsID? screen is displayed.
9. Press Accept to enter Modbus Address Change menu. The current
programmed Modbus address will be displayed (if not programmed at the
factory, the default address is 001).
10. If the Modbus address is correct, keep pressing the Accept button
until you are prompted to
will
then be returned to the MAIN MENU.
11. If the Modbus address is not correct, using the
accept the current Modbus address. You
Accept and Scroll
buttons, change the Modbus address the correct value.
12. You will then be prompted to save the changes. Press Accept to
save, and Scroll to abort. You
will then be returned to the MAIN
MENU.
13. Use scroll button to navigate through the main
menu, scroll until the LCD
button. This
will return you to normal operating mode. The LCD
displays Quit? and press the Accept
menu. To exit the
module can be unplugged at this time.
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OPERATOR M ANU AL
After 5 minutes of inactivity, the LCD returns to normal (idle) operating
display.
Figure 7. LCD Module
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C
Troubleshooting
If low-level signals appear to be surfacing occasionally slightly above 4mA,
the internal offset setting may be the issue, especially for differences in
gain settings that have occurred over time.
INTERNAL OFFSET PROCEDURE:
1. Place the EC-FX detector in Cal. Mode.
2. Unplug the sensor from the main board so that it is not electrically
connected to the EC-FX detector.
3. For units equipped with an LCD option, unplug the LCD ribbon cable
from the main board (the same board the sensor is connected to). This
allows the onboard button to function.
4. Press the button 8 times quickly without pausing between presses; the
yellow LED will blink slowly for 2 min. If the yellow LED doesn’t turn on,
the button press timing was too erratic; repeat the 8 button presses again
until the yellow LED blinks slowly.
NOTE: If at any time in step 4 all three LEDs simultaneously blink
slowly, the 4-20mA calibration was initiated accidently because the
button presses were too slow or not consistent. To exit this mode,
press the button for 1 second until the unit reverts back to “run”
mode, or when the LEDs stop blinking and the green LED is on
solid. Place the detector back in factory calibration mode and
repeat step 4.
5. After the yellow LED turns off, check the mA output and ensure it is 4mA
±0.05mA.
NOTE: If the mA reading is not in range, the 4-20mA output may
need to be re-calibrated. It is not necessary to perform the internal
zero procedure again unless the gain pot was adjusted more than 5
turns.
To re-calibrate the mA loop output, refer to page 21.
Risk of electrical shock.
The LEDs will give visual indication of several sensor
and transmitter
conditions.
If the sensor output is 0 mA: First, verify +24 VDC
at the sensor terminal
block (see Figure 8, Note 2).
Second, check voltage between Test (—) and Test (+)
Voltage should be in the
range of 40 mV to 200 mV corresponding to an
(see Figure 8, Note 3).
actual current flow of 4 mA to 20 mA. If this voltage is 0 mV, the signal has
no path to ground. Check monitoring equipment connections and
configuration.
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OPERATOR M ANU AL
If the sensor output is 0.5 mA: Indicates a fault condition has occurred.
• Most common — failed or disconnected sensor
• Hardware failure (pre-amp)
If the sensor output is erratic: Make sure that the
unit is in clean,
ammonia-free air.
The detector has been factory zeroed and spanned. If the
zero has
become unstable, and there are no interference gases, the most likely
problem is a depleted sensor or a new sensor with high gain left over
from a
has not been performed with the new sensor, turn span pot down (see
Figure 7, Note 1 on page 26), or counterclockwise, 3 full turns. This
will decrease the
previous sensor that was adjusted for aging. If span calibration
sensitivity and reduce the zero calibration of the new
sensor. Calibration is required after this adjustment.
Electrical Interference: This sensor has been designed to be highly
resistant to EMI/RFI using multiple stages of filtering and protection.
However, in extreme
environments, some noise pickup can occur directly
through the sensor. Ensure that the bare shield wire of the instrument cable
is connected to the terminal block marked SHLD at the sensor (not touching
the metal enclosure) and properly grounded at the readout unit.
Interference Gases: The EC-FX-NH3 is designed to be quite specific to
ammonia. However,
some other gases can affect the reading. Phosphene,
methyl mercaptan, and hydrogen can give a slight upscale indication.
Bromine, ozone, fluorine, chlorine, and nitrogen dioxide can give a slight
down-scale indication. Contact Honeywell Analytics if any of these
gases
are present in your application.
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OPERATOR M ANU AL
Figure 8. Troubleshooting
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D Maintenance
For proper operation it is essential that the test and calibration schedule be
followed. Honeywell
• Calibration should be performed with certified calibration gas every
six months. After exposure to a major
operating temperature in a clean air environment. Calibration kits are
available from Honeywell Analytics. See Replacement Parts on page
30.
• Response test once between calibrations, i.e.,
intervals. Expose sensor to
sensor
critical applications. The
electro-chemical sensors are installed in the same
Log all tests and calibrations.
Analytics recommends the following maintenance schedule:
leak, stabilize the sensor at its
at three month
ammonia/water solution to verify proper
response and alarm functions. Test more frequently in highly
response test is not required if multiple
room.
Sensor Life: These electrochemical sensors are
several things can cause the
sensor electrolyte to become depleted
extremely reliable, but
including:
• time
• prolonged exposure to high temperatures
• exposure to varying concentrations of the
target gas
• exposure to some VOCs
• exposure to high moisture for extended periods without proper
sensor enclosure.
Although SensorCheckTM tests the sensor’s electrical viability
every 24 hours, it is
exercised
with a gas sample on a regular and timely basis.
Typical sensor life in a refrigerated area will be three
a non-refrigerated area
ammonia will shorten these times. In
preventative
maintenance program of periodic sensor replacement should
be implemented.
When the sensor becomes depleted, a replacement sensor
Honeywell Analytics. Simply
Sensor, pull the old sensor from the spring clip, discard the old sensor and
replace it with a new one.
absolutely essential that these units be
to four years. Typical life in
will be two to three years. Exposure to high levels of
addition to timely response checks, a
can be obtained from
unplug the ribbon cable from the pins labeled
The sensor should be checked according to the
following procedure after a five-
minute warm-up period.
Note: Typical Electrochemical sensor technology tends to exhibit a slight output
shift downward when there is a small leak or a continuous NH
background
3
surrounding the sensor. For example in a 100ppm unit it is important to
investigate small momentary signal changes that occur above the 4.6 mA
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OPERATOR M ANU AL
• Remove the old EC sensor.
threshold (5ppm) on the EC-FX output and below the first alarm level of 25 ppm
(8 mA). This could be an early warning that a small leak or breach in the NH
system could have occurred in which a constant background of NH
is present.
3
3
False alarms or brief activation of alarm 1 may also be an indicator of the
presence of background or low level NH
3
.
If it is discovered that the EC-FX was exposed to a continuous leak of NH
(for
3
more than 6 hours), it is recommended to allow the sensor to stabilize in clean air
for 48 hours and re-calibrate.
EC Sensor Replacement Procedure
• Plug in new EC sensor, making sure connector pins are
positioned correctly. Be sure
plastic clip (see Figure 8, Note 4 on page 28).
• Allow sensor to stabilize until output reaches 4 mA ±0.5
mA.
• Perform manual SensorCheck
SensorCheck
TM
section.
• Follow the span calibration procedure on page 23.
ribbon cable is snug under
TM
using the procedure in the
Honeywell Analytics’ recommendation is to check the
sensors with certified calibration gas. Follow the procedure in the Calibration
section of this
Replacement Parts
For replacement parts, contact Honeywell Analytics. Be sure to have the model
number and serial number of the unit.
Calibration parts:
EC-FX-CK ECFX cal kit 17/34L .300LPM reg
EC-FX-CK1 ECFX cal kit 29L .300LPM reg
EC-FX-CK2 ECFX cal kit 58/103L .300LPM reg
EC-FX-CA Calibration Adaptor for EC-FX
manual.
calibration of all new
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OPERATOR M ANU AL
Limited Warranty
Limited Warranty
Honeywell Analytics, Inc. warrants to the original purchaser and/or ultimate
customer
any part thereof proves to be defective in
two years of the date of shipment by Honeywell
will be repaired or
shipped prepaid to Honeywell
IL
be returned freight
Honeywell Analytics that the
workmanship. The repair or replacement of any such defective part shall be
Honeywell
limited warranty.
Exclusions
If gas sensors are part of the Product, the gas sensor is covered by a twoyear limited warranty of the manufacturer.
(“Purchaser”) of the EC-FX-NH3 leak detector (“Product”) that if
material or workmanship within
Analytics, such defective part
replaced, free of charge, at Honeywell Analytics’ discretion if
Analytics at 405 Barclay Blvd., Lincolnshire,
60069, in a package equal to or in the original container. The Product will
prepaid and repaired or replaced if it is determined by
part failed due to defective materials or
Analytics’ sole and exclusive responsibility and liability under this
The use of any non-Honeywell parts in the Product voids the warranty.
If gas sensors are covered by this limited warranty, the gas sensor is
subject to inspection by Honeywell Analytics for extended exposure to
excessive gas concentrations if a claim by the Purchaser is made under
this limited warranty. Should such inspection indicate that the gas sensor
has been depleted rather than failed prematurely, this limited warranty shall
not apply to the Product.
This limited warranty does not cover consumable items, such as batteries,
or items subject to wear or periodic replacement, including lamps, fuses,
valves, vanes, sensor elements, cartridges, or filter elements.
Warranty Limitation and Exclusion
Honeywell Analytics will have no further obligation under this limited
warranty. All warranty obligations of Honeywell Analytics are void if the
Product has been subject to abuse, misuse, negligence, or accident or if
the Purchaser fails to perform any of the duties set forth in this limited
warranty or if the Product has not been operated in accordance with
instructions, or if the Product serial number has been removed or altered.
Disclaimer of Unstated Warranties
The warranty printed above is the only warranty applicable to this
purchase. All other warranties, express or implied, including, but not limited
to, the implied warranties of merchantability or fitness for a particular
purpose are hereby disclaimed.
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OPERATOR M ANU AL
Limitation of Liability
It is understood and agreed that Honeywell Analytics’ liability, whether in
contract, in tort, under any warranty, in negligence or otherwise shall not
exceed the amount of the purchase price paid by the purchaser for the
product and under no circumstances shall Honeywell Analytics be liable for
special, indirect, or consequential damages. The price stated for the
product is a consideration limiting Honeywell Analytics’ liability. No action,
regardless of form, arising out of the transactions under this warranty may
be brought by the purchaser more than one year after the cause of actions
has occurred.
34
English
© BW Technologies By Honeywell 2013. All Rights Reserved.
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