Technical Data - Samon TR-EC-NH3 Instrucciones

GB
GENERAL
TR-EC-NH3 is a detector designed to measure the
concentration of ammonia (NH
3
and other areas where ammonia is stored or utilised.
The sensors are of electrochemical type with good selectivity
and high accuracy even at low concentrations.
The detectors provide a linear output signal (4..20mA)
proportional to the concentration of ammonia.
Different measuring ranges are available depending on
requirements and application. The electrochemical sensor has
good selectivity and is not affected by hydrogen (H
common source of interference for ammonia detectors.
STANDARDS AND REGULATIONS:
The use of ammonia in refrigeration systems is regulated by
European Refrigeration Standard (EN378: 2008).
All establishments with > 50 kg ammonia must have a gas
detection systems installed, in engine rooms as well as other
areas, where there is a risk for personnel safety or that values
reach critical limits.
Also check local standards and regulations regarding personnel
protection, explosion and fire hazard, exposure limits,
environmental and labour protection regulations, etc.
ALARM LEVELS:
Alarm levels will depend on where the detector is located and
what needs to be protected. The following levels can be
regarded as benchmarks for various applications:
- Pre alarm (C)
- Leakage alarm (B)
- Main alarm (A)
LOCATION / INSTALLATION
TR-EC-NH3 should be mounted on the wall, at least 150 cm
above the floor and not closer to ceiling than ~20 cm from the
ceiling as residual gas can be difficult to ventilate.
The detector must be installed so that it is reasonably
easily accessible for service and maintenance.
WIRING DIAGRAM
The transmitter needs a power supply of 12..36V DC to
operate. Connect the power source to the connector.
Pay attention to the polarity.
Specifications subject to change
IS TR-EC-NH3 1306.doc
TR-EC-NH3
) in engine rooms, cold rooms,
) which is a
2
50–300 ppm
500–1000 ppm
>3000 ppm
(4..20mA)

TECHNICAL DATA:

Model: TR-EC-NH3
Gas type: Ammonia (NH
Material: Polycarbonate PC
Method: Electrochemical
Range: 0-100 ppm
0-1000 ppm
0-5000 ppm
0-10000 ppm
Calibration interval: > once a year.
Lifetime sensor: ~ 2-3 year
Power consumption: 20mA
Max (R ): 250 ohm (input impedance)
L
Power supply: 12..36V DC
Output: 4..20mA linear
Ambient temp: -30
Ambient humidity: 15-90% RH
Enclosure: IP56
Dimensions: 80x82x60 mm
Weight: 180g
Approvals: CE, EMC
SENSOR LIFESPAN
The actual lifetime for sensors can be expressed as "ppm-
hours", i.e. if the sensor is exposed to a high concentration of
gas and for a period of time, life expectancy will be shortened.
Presence of other contaminant gases can also shorten the
sensors lifespan expectancy.
When replacing sensor:
The spring/jumper on the sensor must be removed before
connecting into the electronic circuit, then follow the instructions
below.
CALIBRATION
The voltage output signal can be measured between pins 1 and
2. To obtain the current output signal, refer to the last section.
The output signal has a linear range from 40..200mV and
4..20mA respectively.
To adjust the zero point;
- Make sure the sensor is clean from ammonia by ventilating it
in fresh air or applying synthetic air with flow ~ 0.5 l/min for ≥ 3
minutes.
- Adjust potentiometer [Zero] until the output is 40mV.
To adjust "span";
- Apply gas with concentration (ppm) corresponding to the
detector's maximum range (airflow 0,5 l/min) until the signal is
stable, ~1 minute.
- Adjust potentiometer [Span] until the output signal is 200 mV.
If a gas with lower concentration than maximum is used for
span calibration, the expected output signal must be calculated
using a linear relationship.
Contact technical support for further assistance.
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