Emergency mode
The current outputs of the transmitter may be programmed via Modbus commands
to signal if the connection with the sensor is lost. The signal may be set to 3,8 mA
or 21,5 mA. See the table of Modbus registers for more information.
Return to default settings
To reset the device’s Slave ID, baudrate and sbit number to factory settings,
proceed as follows:
1. De-energize the device
2. Connect the J3 jumper
3. Turn on the device
4. De-energize the device
5. Disconnect the J3 jumper
6. Turn on the device
Calibration
E2618-NH3 has been calibrated by Manufacturer with standard gas mixtures
before delivery. The semiconductor gas sensor exhibits high stability and ~10 year
lifetime. However, as the gas sensor is directly exposed to environment, the
instrument requires at least annual field recalibration with a portable calibration kit.
For electrochemical sensor recalibration is necessary every 6 month.
Please contact your distributor for more information.
Delivery set
– Ammonia transmitter E2618-NH3 or E2618-NH3-DM
– Mounting accessories:
4 screws with plastic dowels for wall mount version
25 mm cable gland for duct mount version.
fixing clamp for remote probe versions
Warranty
This product is warranted to be free from defects in material and workmanship for a
period of one year from the date of original sale. During this warranty period
Manufacturer will, at its option, either repair or replace product that proves to be
defective. This warranty is void if the product has been operated in conditions
outside ranges specified by Manufacturer or damaged by customer error or
negligence or if there has been an unauthorized modification.
E2618-NH3_UM_EN
Rev 05.05.2016
General technical data
Sensor type
long-life metal-oxide gas sensor as standard
electrochemical cell on request
Detected gase/calibration Ammonia NH
3
Gas unit
ppm
Sampling method
diffusion
Detection range
0...1000 ppm
Resolution
1 ppm
Accuracy
± 5 ppm
Warm-up time
≤
10 min
Signal update
every 1 second
Response time
~2 minutes
Self-diagnostics
full functionality check at start-up
Power supply
11...30 VDC,
Power consumption
< 2 W
Analog outputs
2 × 4-20 mA / 0-10 V, user settable, freely configurable
scales from 0-100 ppm to 0-1000 ppm
Digital interface
RS485, Modbus RTU protocol
no galvanic isolation, common-mode voltage -7...+12 V,
Cable connections
screwless spring loaded terminals
Enclosure
grey ABS, wall mount, protection class IP65
Dimensions
H82 × W80 × D55 mm
Operating environment
industrial indoor and outdoor locations
Operating conditions
-40...+85 °C, 0...100 %RH
Maintenance interval
12 month (6 month for electrochemical sell)
Sensor lifetime
> 5 years
CE marking
according to 2014/30/EU and EN61326-1 requirements
RS485 communication interface
Databits: 8
Parity: none
Stop bits: 1 or 2
Protocol: Modbus RTU
Supported Modbus functions:
03 - read multiple registers
06 - write single register
Communication parameters
Parameter
Permitted values
Default
Supported
baudrates
1200, 2400, 4800, 9600, 19200,
38400, 57600
9600
Data bits
8
8
Parity
none
none
Stop bits
1, 2
1
Protocol
Modbus RTU
Modbus functions
03 - read multiple registers
06 - write single register
Error codes
01 - illegal function
02 - illegal data address
03 - illegal data value
04 - slave device failure
(details of last error 04 can be read from register 0x0008)
Evikon MCI OÜ
Teaduspargi
7
, Tartu
Tel.: +372 733 6310 51014 Estonia
www.evikon.eu
Ammonia transmitter
E2618-NH3
User manual
