Manual

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.
HEALTH AND SAFETY AT WORK ACT 1974
WARNINGS
1. 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.
2. 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 MIS-APPLICATION
IS AVOIDED.
OPERATING PRINCIPLES
Pressure applied to the Bourdon Tube actuates
the Primary mechanism and hence rotates the
motion Transfer shaft. The motion transfer
shaft in turn actuates the secondary mechanism
and hence operates the microswitch. When the
pressure is decreased the motions are reversed
thereby resetting the microswitch.
INSTALLATION
The instruments are designed to be mounted
vertically, with the process connection
underneath, onto a wall or panel using the
backplate provided. Select the mounting point
so as to avoid excessive shock, vibration or
temperature fluctuations. Instruments should
be mounted to avoid excessive heat transfer
from the process lines or adjacent plant.
Direct Mounting: When direct mounting to the
process connection is required the instrument
should:
a) Be supplied with a ½” NPT process
connection.
b) Be given additional local support via
the backplate provided, to avoid
damaging stresses being applied to
the assembly by accidental impact,
shock or vibration.
Set Point Adjustment: Model 233, 234 (Fig 3)
Model 234 provides 2 microswitches that can
be set independently using a special
mechanism, which fulfils the need for HI LO
switching. Adjust as follows:
1. Isolate the instrument from process
and power.
2. Remove the instrument lid.
3. Loosen either locking screw.
4. Move the indicator to the desired
position. Move the indicators to the
right to raise the set point and to the
left to lower the set point.
5. The indicators can be set
independently of each other, thus
giving a range of HI/LO separation
from approximately 15% to 100% of
span.
6. Tighten the locking screws taking
care not to over tighten.
7. Replace the instrument lid (see
maintenance).
Switching Differential Adjustment: Model
232 (Fig 4)
1. Isolate the instrument from process
and power.
2. Remove the instrument lid.
3. Rotate the knurled plastic wheel on
the microswitch to adjust the switch
differential. Rotate clockwise to
increase the differential and counter
clockwise to reduce the differential.
4. Replace the instrument lid (see
maintenance).
Switching Differential Adjustment: Model
233 (Fig 3)
The model 233 provides a single microswitch,
which can have the set and resets points
independently adjusted over a range of
approximately 15% to 100% of span.
Note: For accurate setting a suitable pressure
gauge must be used in conjunction with the
above procedure. Do not attempt to set the
switch outside the scale limits. Though the unit
may be set anywhere within its operation range,
for optimum performance, it is good practice to
have a set point value between 25% and 75%
of span.
PRODUCT CODE
ENCLOSURE
MODEL
ELECTRICAL ENTRY
MATERIAL OF WETTED PARTS
RANGE
SWITCHING OPTIONS
PROCESS CONNECTION
OPTIONS AND TREATMENTS
SPECIAL ENGINEERING
Use a spanner to support the process
connection when fitting the instrument. When
fitting the instrument lid make sure gaskets and
‘O’ rings are in good condition and fitted
correctly.
WARNING: CHECK THE CONNECTION
THREAD SIZE AND SPECIFICATION ON THE
UNIT TO AVOID MIS-MATCHING WITH THE
PROCESS CONNECTION ADAPTOR. SEE
DIGIT 6 OF PRODUCT CODE.
REPLACEMENT PARTS
Use only factory authorised parts and
procedures. The only parts normally
recommended for site replacement are the
microswitches. However, in some
circumstances other spares kits are available.
Apply for details quoting the serial number and
full product code.
WARRANTIES – SEE CONDITIONS OF SALE
WIRING (Fig 1)
Wire in accordance with local and National
codes. Use cables no larger than 2.5 mm
2
(14AWG). Deliver electrical connection through
a suitable cable gland, which will maintain the
IP rating of the instrument. Insert bare wires
fully into the terminal block and tighten
securely. Keep wiring tails to a minimum and
check that wires do not interfere with the
operating mechanism. Use the earthing points
provided.
CERTIFIED ENCLOSURES
All Series 230 Pressure Switches can be
supplied with BASEEFA certified enclosures to
the following standards:
Zone 1 (Div 1) IEC 79-1
BS 5501 Parts 1 and 5: EN50 014 and EN50
018 CENELEC Codes ‘H’ for aluminium and ‘K’
for cast iron. EExd IIC T6
BS 4683 Part 2 Code ‘M’ Cast Iron Exd I T6 for
mining.
Electrical Adaptors
Zone 1. Use only certified adaptors for Zone 1.
WARNING: IT IS A REQUIREMENT OF
SAFETY THAT AT LEAST 5 FULL THREADS
ARE ENGAGED BETWEEN THE ADAPTOR
AND CONDUIT ENTRY. TAKE CARE TO
SELECT AND INSTALL ADAPTORS THAT
DO NOT REDUCE THE ENCLOSURE IP
RATING.
Zone 2. Adaptors used must have equivalent
IP rating to the enclosure and be impact
resistant to 7 Nm.
References for Selection and Installation
BS 5345 Part 3 for Enclosure Codes H and K
BS 5345 Part 4 for all Enclosure Codes
(Intrinsic Safety)
BS 5345 Part 7 for Enclosure Code N
BS 5501 Part 1 for Enclosure Codes H and K
(BS EN50 014)
BS 5490 IEC 529 IP RATING (Ingress
Protection)
MAINTENANCE
Inspections should be carried out at quarterly to
yearly intervals depending upon conditions.
Isolate the unit from process and power and
remove the lid. Check all terminals for
tightness. Check that cable tails are not fouled
or chafed. Check for internal condensation.
Rectify as necessary.
It is recommended that instruments used to
provide an alarm are operated periodically to
ensure they are functioning correctly.
If further maintenance is required seek advice
from DELTA CONTROLS before attempting
repair or replacement of parts.
CAUTION
Moving parts have been treated with a water
repelling lubricant before leaving the factory.
Occasional inspection and the application of a
water repelling lubricant is recommended to
ensure moving parts remain free under all
conditions.
Zone 1 enclosures
Thread seal and contact surfaces must be
lightly lubricated using non-setting non-
corrosive grease compatible with the lid seal
(Nitrile). Do not use copper bearing grease on
aluminium. Screw on lid hand tight making sure
that mating surfaces of the lid and enclosure
are in contact. Re-tighten the lid lock screw.
WARNING: IT IS A SAFETY REQUIREMENT
THAT AT LEAST 5 FULL THREADS ARE
ENGAGED WHEN THE UNIT IS IN
OPERATION. NEVER OPERATE THE UNIT
UNLESS THIS CONDITION IS MET. DO NOT
USE GREASES OR LUBRICANTS NOT
COMPATIBLE WITH THE ENVIRONMENT OR
PROCESS.
Weatherproof Enclosure (W) and N
If lid gasket is damaged, replace with new
gasket. Make sure gasket aligns correctly with
sealing faces.
Stainless Steel Weatherproof Enclosure (A)
Check gasket, if damaged replace.
OPERATION
Pressure switches are calibrated against falling
pressure unless otherwise specified. Set Point
adjustment refers to falling pressure. Switching
differential is the difference between the set
point and the operating value on rising
pressure. For opening details see Fig 5, 6, 7.
Set Point Adjustment: Models 231, 232 (Fig
2)
1. Isolate the instrument from process
and power.
2. Remove the instrument lid.
3. Loosen either locking screw.
4. Rotate the adjuster to move the
indicator along the calibrated scale.
Rotate clockwise to raise the set point
and anti-clockwise to lower the set
point.
5. Retighten the locking screw taking
care not to over tighten.
6. Replace the instrument lid (see
maintenance).
NOTE: FIGS 5, 6, 7 SHOW STANDARD
MOUNTING ARRANGEMENTS
ISSUE E 02/10
INSTALLATION, OPERATING AND
MAINTENANCE INSTRUCTIONS FOR
BOURDON TUBE ACTUATED
SERIES 230 PRESSURE SWITCHES
(Models 231, 232, 233, 234)
Fig 4
Fig 1
Fig 5
Fig 6
Fig 7
In the interest of development and improvement Delta Controls Ltd, reserve the right to amend without notice,
details contained in this publication. No legal liability will be accepted by Delta Controls Ltd, for any errors,
omissions or amendments.
YOUR TRUSTED PARTNER IN PROCESS INSTRUMENTATION
DELTA CONTROLS LIMITED, ISLAND FARM AVENUE, WEST MOLESEY, SURREY KT8 2UZ
T [phone] F [phone] E [e-mail] W www.delta-controls.com
Stock No: 002522/231
Registered Office Registered in England No 5369683
Fig 4
Fig 2