6
UR21S-MOI-IT-W-ML-10-22-Rev0
Watts Water Technologies, Inc.
EN
Type of contact selection
For each relay there is a pair of removable terminals to which
the type of contact (NC or NO) can be associated, selectable
by jumpers JP1…JP4 of the relay card.
Contact NC or NO of pre-alarm relay
Contact NC or NO of 1st Threshold relay
Contact NC or NO of 2nd Threshold relay
Contact NC or NO of Fail realy
Setting of relay control logic:
To perform the setting of the control logic of the direct relays
(relay energized in the presence of an event) or reverse (relay
energized in the absence of an event), it is necessary to act
on the 6th dip-switch of the SW1 selector; in particular:
Preliminary check after
mechanical and electrical
installation
Sensor is calibrated at the factory and therefore no calibra-
tion operations are planned once installed; however, after
installation it is necessary to perform a functional check of the
sensors.
When the device is powered, it will set itself in the sensor
preheating phase, which lasts about 2 minutes.
After this time the sensor will go into the normal operating
state, however the best performance will be obtained after
about 2 hours.
With the operating sensor it is necessary to verify its response
using the specific connection pipe between the cylinder and
adapter, approximately 2m long.
During the test it is necessary to observe the value of the
output current, the status of the LED visible outside the sen-
sor body and, if present, the status of the LEDs on the relay
board, before closing the case.
The LED on the sensor body and the 4÷20mA output have
the following functional meaning:
After applying the gas mixture at 50% of the LEL of the Meth-
ane gas (or at 500ppm for the CO) using the test kit (test gas
application time > 2 minutes), make sure that the 4÷20mA
output is between the 11 and 13 mA for Methane (or between
19 and 21mA for CO), the status LED flashes with 4 pulses
every 5 seconds and the prealarm, 1st and 2nd alarm thresh-
olds relays of the relay board are energized (or de-energized if
SW1.6 is set to ON).
Troubleshooting
For troubleshooting, having only one LED that identifies the func-
tional states described in the table above, when operating anom-
alies occur, in addition to the usual power and wiring checks, it
is necessary to use the TUS40 terminal or use the Display Board
(if present) and refer to the relevant product documentation (see
also Notes 2 and 3 in technical features for Over-Range Failure).
Maintenance
Every three to six months a functional check of the sensors must
be carried out, in accordance with the instructions contained in
Standard EN60079-29-2.
Routine
The routine check involves the performance of the same
tests as described in the chapter concerning preliminary
checks after mechanical and electrical installation.
Corrective
Any failure found during the periodic checks of the sensors
must be followed by sending the sensor to your Supplier /
Installer, who will send it to Watts.
Possible sensors non-calibration found during the periodic
checks can be identified and corrected with the help of the
TUL40.. test kit .. and the TUS40.. service terminal, (or of the
display board) which must be connected to the sensor (on
the CN3 connector) through the appropriate communication
interface integrated in the cable.
For the sensor recalibration procedure, refer to the docu-
mentation supplied with the service terminal, the display
board or the card for the magnetic actuator.
Disassembly
Power off the detector, disconnect the wire on the terminals
and dismount the housing from any blocking system. Dis-
pose according to the instructions in the dedicated chapter.
DL1 (Yellow),Sensor
FAILURE
DL2 (Red),2nd alarm
threshold
DL3 (Red),1st alarm
threshold
DL4 (Red),Pre-alarm
Type of contact selection
(JP1÷JP4):
direct logic
reverse Logic
Sensor
Operating Mode
4÷20mA
Output
Status Led on
Sensor Body
PREHEATING
2mA
Flashing with 2 Hz
frequency
WORKING
4÷20mA
0,10,20mA
for threshold
applications
1 pulse “ON” every
about 10s
PRE-ALARM
2 pulses “ON” every
about 5s
1
st
ALARM
THRESHOLD
3 pulses “ON” every
about 5s
2
nd
ALARM
THRESHOLD
4 pulses “ON” every
about 5s
FAILED SENSOR
22mA
ON steady
OVER-RANGE
FAILURE
22mA
1 pulse “OFF” every
about 5s
