Delta Controls 204 - 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.
3. TYPE W AND A ENCLOSURES HAVE A SAFETY
BLOW-OUT DISC FITTED IN THE REAR OF THE
ENCLOSURE
TO PREVENT DANGEROUS
PRESSURISATION OCCURRING IN THE EVENT OF
A DIAPHRAGM FAILURE. THIS MUST NOT BE
OBSTRUCTED DURING INSTALLATION. LEAVE AT
LEAST 6MM CLEARANCE BETWEEN THE BACK
FACE OF THE ENCLOSURE AND THE MOUNTING
SURFACE. DO NOT REMOVE OR REPLACE WITH
ANY OTHER DEVICE NOT APPROVED BY DELTA
CONTROLS. DO NOT REMOVE AND REFIT
BACKPLATE SO AS TO OBSTRUCT THE BLOW-
OUT DISC.
OPERATING PRINCIPLES
A diaphragm is used to sense the process pressure.
The diaphragm transmits a force proportional to the
applied pressure to an operating beam. The beam is
restrained by an adjustable spring. When the force on
the beam overcomes the spring tension the beam
moves and operates a switch or switches. On
reduction of the applied pressure the force applied to
the beam also falls, the beam is restored to its original
position by the spring, and the switch resets.
REPLACEMENT PARTS
Use only factory authorised parts and procedures.
The only parts recommended for site replacement
are the microswitches.
WARRANTIES - SEE CONDITIONS OF SALE
PRODUCT CODE
ENCLOSURE
MODEL
ELECTRICAL ENTRY
MATERIAL OF WETTED PARTS
RANGE
SWITCHING OPTIONS
PROCESS CONNECTION
OPTIONS AND TREATMENTS
SPECIAL ENGINEERING
On enclosures H, K and M remove the lid using an
appropriate tool if tight, eg edge of spanner or a metal rod
(fig 3).
INSTALLATION
The instruments are designed to be mounted vertically with
the process connection underneath. They can be mounted
either direct to process or to a wall or panel using the
backplate provided. Select the mounting point so as to
avoid
excessive shock, vibration or temperature
fluctuation. Instruments should be mounted to avoid
excessive heat transfer from the process lines or adjacent
plant.
If sudden changes of pressure (pulsations) are likely then
we recommend that snubbers are fitted between the
process line and the switch.
Model 204
Use a spanner to support the process connection when
fitting the instrument. When fitting the instrument lid make
sure gaskets or '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 11 OF PRODUCT CODE.
WIRING (Fig 1)
Wire in accordance with local and National codes. Use
cables no larger than 2.5 mm sq. (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 200 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.
Code "M" Cast Iron Exd I T6 for mining.
Zone 2 (UK Only)
BS 4683: Part 3, Enclosure Code "N". ExN II T6
All the above mentioned enclosures are suitable for
outdoor use rated IP 66. Only operation, maintenance or
repair procedures either contained herein or approved by
Delta Controls may be used, to avoid rendering the
equipment unsafe in operation and/or nullifying the
Certification. NO MODIFICATIONS ARE PERMITTED.
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 N.m
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 EN 60529 IP RATING (Ingress Protection)
MAINTENANCE
Inspections should be carried out at quarterly to yearly
intervals depending upon operating 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.
WARNING: DOES NOT APPLY TO OXYGEN SERVICE.
Zone 1 enclosures
Thread seal and contact surfaces must be lightly lubricated
using a non-setting non-corrosive grease compatible with
the Nitrile lid seal. 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 dried out or damaged, replace with new
greased gasket.
Stainless Steel Weatherproof Enclosure (A)
Check gasket. If damaged, replace.
OPERATION
Pressure switches are supplied 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.
Set Point Adjustment: Models 204, 208, 209 (Fig 2)
1. Isolate the instrument from process and power.
2. Remove the instrument lid.
3. Loosen the M3 hexagon head locking screw.
4. Rotate the 20 mm A/F hexagon head adjuster knob to
move the indicator along the calibrated scale. Rotate
clockwise to increase the set point and counter clockwise
to decrease the set point.
5. Retighten the locking screw taking care not to
overtighten.
6. Replace the instrument lid (See maintenance).
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.
ISSUE G 05/09
SPDT REAR FRONT
SWITCH SWITCH
2 x SPDT
NC = NORMALLY CLOSED
COM = COMMON
NO = NORMALLY OPEN
INSTALLATION, OPERATING AND
MAINTENANCE INSTRUCTIONS FOR
DIAPHRAGM OPERATED SERIES 200
PRESSURE SWITCHES
(MODELS 204, 208, 209)
To remove lid on enclosures H,K & M rotate lid
locking mechanism and where lid is tight use a
flat bar (see below) or edge of ring spanner to
open
Recommended size of bar suitable for opening
instrument. Material needs to be hard chrome
steel spanner grade.
ADJUSTER KNOB
LOCKING SCREW
LOCKING PLATE
SCALE PLATE
INDICATOR
MODEL 204
MODEL 209
Fig. 6
Fig. 7
MODELS H, K, M 204
Fig. 5
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 +44 (0) 208 939 3511 F +44 (0) 208 783 1163 E [email protected] W www.delta-controls.com
Stock No: 002522/204
Registered Office Registered in England No 5369683
MODEL 208
All dimensions mm. (inches)
* Add 10mm.(0.39”) for enclosure N
Fig. 4
Fig. 3
Fig. 2
Fig. 1
Fig. 7