TR-SC-…
(4..20mA / 0..10V DC)
IS TR-SC-... 1306.doc
5
GB
GENERAL
TR-SC-… is a series of transmitters for measuring
concentration of different gases. The transmitters are available
in three different models, TR-SC… standard room type, TR-
SCK… for duct mounting and TR-SCR… for vent lines (blow
out pipes) from safety valves.
The sensor heads are semi conductive type which gives long
lifetime and stability but with limited selectivity.
The transmitter gives a non linear output signal (4..20mA or
0..10V DC) proportional to the gas concentration. For long
wiring installations it is recommended to use the current output
signal to minimize the risk for interference.
Output signal mode is set by jumper
[JP1]
(see PCB layout).
CALIBRATION
“Zero” signal is measured at test terminal
[Test]
.
To adjust ”zero”;
- Apply clean air for at least 3 minutes.
- Adjust potentiometer
[ZERO]
to the offset value in
[TABLE 1]
.
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
20mA/10V DC.
If gas with lower concentration than maximal is used for span
calibration, the expected output signal must be calculated
according to a graph for each sensor type.
Contact technical support for more information.
INSTALLATION
When mounting the transmitter consider target gas specific
weight and air circulation in the room or area. See examples on
previous page.
Connect the transmitter according to the wiring diagram.
TECHNICAL DATA - Common
Sensor type:
Semiconductor
Response time (T90): <10 seconds
Output signal:
4..20mA (max 500 ohm) /
0..10V DC
Calibration:
“zero / span”
≥
once per year
Lifetime sensor:
>5 years (replacement recommended
every 5
th
year or when unit can not be
recalibrated)
Power supply:
12..30V DC
Housing:
PC polycarbonate (IP54)
Cable gland:
1 x M16
Specification subject to change
PLEASE NOTE
The sensors in the TR-SC-series have limited
selectivity for different types of gas. If the detector
is placed in the environment in which other gases
or fumes may be present, these compounds might
generate false alarms.
Examples of substances that can cause false
alarms are petrol fumes, solvents, cleaning agents,
cigarette smoke, etc.
TR-SC, Splash proof (IP54)
MODEL
Range / gas
TR-SC-HCFC-4000
0-4000ppm / HCFC (R22)
TR-SC-HFC(A)-4000 0-4000ppm / HFC (R404a, R407a,
R410a, R507)
TR-SC-HFC(B)-4000 0-4000ppm / (R134)
TR-SC-NH3-1000
0-1000ppm / Ammonia
TR-SC-NH3-4000
0-4000ppm / Ammonia
TR-SC-HC
0-50% LEL / Hydrocarbon
TR-SC-H2
0-50% LEL / Hydrogen
TECHNICAL DATA
Housing:
Polycarbonate / ABS
Operating temperature: -40..+50
o
C
Operating humidity:
10-90 % Rh (non condensing)
Dimensions:
130x82x56 mm
TR-SCK, Duct mounting
MODEL
Range / gas
TR-SCK-HCFC-4000 0-4000ppm / HCFC (R22)
TR-SCK-HFC(A)-4000 0-4000ppm / HFC (R404a, R407a,
R410a, R507)
TR-SCK-HFC(B)-4000 0-4000ppm / (R134)
TR-SCK-NH3-1000
0-1000ppm / Ammonia
TR-SCK-NH3-4000
0-4000ppm / Ammonia
TR-SCK-HC
0-50% LEL / Hydrocarbon
TR-SCK-H2
0-50% LEL / Hydrogen
TECHNICAL DATA
Transmitter housing: 80 x 82 x 56 mm (IP54)
Duct tube:
Plastic, L 350mm (PVC)
Operating temperature: 0..+50
o
C
Operating humidity:
10-90 % Rh (non condensing)
MOUNTING
The plastic tube with the sensor head should be mounted
through the duct wall. The tube gland holds the plastic tube and
seals against the duct. Check locations of the holes in the
plastic tube, it is important that they are mounted correctly to
get a good airflow through the tube.
The sensor cable is as standard 1,5m but is available as option
with 5m or 8m.
A distance of three times the duct diameter should be kept in
front of a damper, filter or change of the duct direction, and 5
times the diameter after these devices.
TR-SCR, For Vent lines (blow off pipe)
MODEL
Range / gas
TR-SCR-HFC(B)-4000 0-4000ppm / HFC (R134)
TR-SCR-NH3-4000
0-4000ppm / Ammonia
TECHNICAL DATA
Transmitter housing: 80 x 82 x 56 mm (IP54)
Pipe connection:
70x25 mm
HFC - brass ½”-flare
NH
3
- steel R½”
Operating temperature: 0..+50
o
C
Operating humidity:
10-90 % Rh (non condensing)
MOUNTING
The brass or steel sensor holder is fitted in to the safety valves
outlet tubes using a T-connection. It is important not to install
the sensor so it blocks the gas flow if the safety valve opens.
