Delta Controls S24 Installation, Operation & Maintenance Instructions Manual

Installation, Operation &
Maintenance
Industrial Series
Models S21, S22, S24 (Pressure Switches)
Models S31, S34 (Differential Pressure Switches)
Model S71 (Temperature Switches)
GENERAL
The unit is manufactured, checked and supplied in
accordance with our published specification, and
when installed and used in normal or prescribed
applications, with the lid in place and within the
parameters set for mechanical and electrical
performance, will not cause danger or hazard to life
or limb.
THE USERS ATTENTION IS DRAWN TO
THE FACT THAT, WHEN THE UNIT IS
'LIVE' WITH RESPECT TO ELECTRICAL
OR PRESSURE SUPPLIES, A HAZARD
MAY EXIST IF THE UNIT IS OPENED OR
DISMANTLED.
UNITS MUST
INSTALLED BY SUITABLY TRAINED AND
QUALIFIED
ACCORDANCE
CODES OF PRACTICE SO THAT THE
POSSIBILITY OF FAILURE RESULTING IN
INJURY OR
MISUSE
AVOIDED.
OPERATING PRINCIPLES
Pressure Switch models S21, S22, S24 and
Differential Pressure Switch models S31, S34 are
diaphragm operated switches.
These diaphragms generate a force proportional to
the applied pressure and are balanced by a user
adjustable control spring. When the force exceeds
that created by the control spring, the diaphragm
moves causing a push rod to actuate a snap-acting
micros-witch.
Temperature model S71 works in the same way as
the Pressure models with the exception that the
applied pressure comes from the expansion of a
vapour enclosed in either a rigid stem or semi-rigid
thermal system.
CERTIFICATIONS
ATEX
Intrinsically safe Models
For Zone 0 models (Enclosure code 4/5, see Table 1 of
TDS)
II 1 G Ex ia IIC T6 Ga (Tamb = -25°C to +60°C)
T5 Ga (Tamb = -60°C to +80°C)
Instructions
BE SELECTED
PERSONNEL
WITH APPROPRIATE
DAMAGE CAUSED
OR MISAPPLICATION
www.delta-controls.com
Flameproof Models
For Zone 0/1 models (Enclosure code 2/3, see Table 1
of TDS)
With Fluorosilicone O-ring
II 1/2 GD Ex d IIC T6 Ga/Gb (Tamb = -60°C to 65°C)
Ex ta/tb IIIC T85°C Da/Db
or
II 1/2 GD Ex d IIC T5 Ga/Gb (Tamb = -60°C to 80°C)
Ex ta/tb IIIC T100°C Da/Db
With Nitrile O-ring
II 1/2 GD Ex d IIC T6 Ga/Gb (Tamb = -30°C to 65°C)
Ex ta/tb IIIC T85°C Da/Db
or
II 1/2 GD Ex d IIC T5 Ga/Gb (Tamb = -30°C to 80°C)
Ex ta/tb IIIC T100°C Da/Db
For Zone 1 models (Enclosure code H/R, see Table 1
AND
of TDS)
IN
With Fluorosilicone O-ring
II 2 GD Ex d IIC T6 Gb (Tamb = -60°C to 65°C)
Ex tb IIIC T85°C Db
or
BY
II 2 GD Ex d IIC T5 Gb (Tamb = -60°C to 80°C)
IS
Ex tb IIIC T100°C Db
With Nitrile O-ring
II 2 GD Ex d IIC T6 Gb (Tamb = -30°C to 65°C)
Ex tb IIIC T85°C Db
or
II 2 GD Ex d IIC T5 Gb (Tamb = -30°C to 80°C)
Ex tb IIIC T100°C Db
cCSAus
For use in Class 1, Group C/D, Class II, Groups E/F/G,
Div. 1 & 2 (Enclosure code T/U, see Table 1 of TDS)
INSTALLATION
Mounting (All models)
The instruments are designed to be mounted
vertically with the process connection underneath.
However, mounting up to 45° from the vertical in any
plane is acceptable, although a small calibration shift
may occur. They can be mounted either direct to
process, or to a wall or panel using the mounting
holes provided. Select the mounting point so as to
avoid excessive shock, vibration or temperature
fluctuation. External sources of heating or cooling
should be
installation. To avoid undue stresses being imparted
to the instrument when wall/panel mounted, it is
recommended that a short length of flexible line be
installed between the instrument and process line. If
sudden changes of pressure (pulsations) are likely
then we recommend that snubbers are fitted
between the process line and instrument.
IOM-INDUSTRIAL REV.C: MAY 2015
taken into consideration during