Delta Controls T01 - Manual

002522-SENTRY-C : FEB 2012
www.delta-controls.com
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.
Installation, Operation &
Maintenance
Instructions
Sentry Series
Models P0* (Pressure Switches)
Models D0* (Differential Pressure Switches)
Models T0* (Temperature Switches)
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 BE SELECTED AND
INSTALLED BY SUITABLY TRAINED AND
QUALIFIED PERSONNEL IN ACCORDANCE
WITH APPROPRIATE CODES OF PRACTICE
SO THAT THE POSSIBILITY OF FAILURE
RESULTING IN INJURY OR DAMAGE
CAUSED BY MISUSE OR MISAPPLICATION
IS AVOIDED.
Operating principles
Pressure Switch models P0* and Differential Pres-
sure Switch models D0* are diaphragm operated
switches.
These diaphragms generate a force proportional to
the applied pressure and are balanced by a user ad-
justable 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 models T01 & T02 work 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.
occur. They can be mounted either direct to process,
or to a wall or panel using the mounting holes provid-
ed. Select the mounting point so as to avoid exces-
sive shock, vibration or temperature fluctuation.
Instruments should be mounted to avoid excessive
heat transfer from the process lines or adjacent plant.
To avoid undue stresses being imparted to the instru-
ment 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. Use a spanner to support the process
connection when fitting the instrument.
CHECK THE CONNECTION THREAD SIZE
AND SPECIFICATION ON THE UNIT TO
AVOID MIS-MATCHING WITH THE PROCESS
CONNECTION ADAPTOR. SEE DIGIT 11 OF
PRODUCT CODE.
Mounting (T01 - Rigid Stem)
Assemble the unit via a thermowell, using the
spanner facility provided and ensuring that:
a) the sensing bulb is fully immersed in the
process temperature
b) the sensing bulb does not bottom out in the
thermowell which could cause damage
Mounting (T02 - Capillary system)
Mount the sensing bulb so that the capillary end is
above the bulb and the bulb is level with, or no more
than 250mm below the base of the instrument. The
stem is fitted with a sliding compression gland to
accommodate different thermowells.
Wiring
DISCONNECT ALL SUPPLY CIRCUITS
BEFORE WIRING
WIRE IN ACCORDANCE WITH LOCAL AND
NATIONAL CODES. USE CABLES NO
LARGER THAN 2.5 MM 2 (14 AWG)
DO NOT EXCEED ELECTRICAL RATINGS
STATED
IN LITERATURE AND ON
NAMEPLATES.
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