Whilst every effort has been made to ensure the accuracy of this specification, Sontay cannot accept responsibility for damage, injury, loss or
expense resulting from errors or omissions. In the interest of technical improvement, this specification may be altered without notice.
Page 3 of 3
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SD-521
Issue: 5.8
Date Of Issue: 02/06/2010
© 2010 Sontay Limited. All rights reserved.
Installation
1. The SD-521 should only be installed by a competent,
suitably trained technician, experienced in installation
with hazardous voltages. (>50Vac & <1000Vac or
>75Vdc & 1500Vdc)
2. Ensure that all power is disconnected before carrying out
any work on the SD-521.
3. Maximum cable is 2.5mm², care must be taken not to
over tighten terminals.
4. If the sensor is mounted outside, it is recommended
that the unit be mounted with the cable entry at the
bottom. If the cable is fed from above then into the
cable gland at the bottom, it is recommended that a rain
loop be placed in the cable before entry into the sensor.
5. Drill two holes at 142mm centres, and a 26mm dia.
probe hole as dimensions on page 3. Fix the IP65 hous-
ing to the duct with appropriate screws.
6. Remove the front cover by undoing the two screws on
the lid and separating from the main body.
7. Feed the cable through the waterproof gland and termi-
nate the cores at the terminal block. Leaving some slack
inside the unit, tighten the cable gland onto the cable to
ensure water tightness.
8. Replace the lid after the connections have been made.
9. Ensure the voltage is within the specified tolerances.
10. Allow 3 minutes before checking functionality.
11.
Allow 30 minutes before any pre-commissioning checks.
Connections
Links & adjustments:
Terminals:
VR1 Do
NOT adjust
1 - 0V
VR2
Sensitivity
2 - 24Vac/dc
LK1:
3 - 2-10Vdc Output
ON = Output damped
4- Relay common
OFF = Output un-damped
5 - Not used
LK2:
6 - Relay N/O
ON = Alarm manual reset
OFF = Alarm auto reset
Connections (continued)
Relay Mode
All units are supplied in manual-reset mode. To convert to
auto-reset mode, remove the link LK2. To revert back to
manual-reset replace the LK2 link.
To reset an alarm, or after power failure, press the RESET
button on the sensor lid.
Dimensions
6
5
4
1
2
3
LK1
LK2
VR2 VR1
160.9 mm
148.9 mm
67.
0 m
m
360.
0m
m
60.
0m
m
25.
0 m
m
