Delta Controls 201 User Manual

Delta Controls Sensors

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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 BELLOWS 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.

CAUTION
Applied vacuum will damage some low pressure range
instruments unless they are supplied in protected form.

OPERATING PRINCIPLES
A metal bellows is used to sense the process
pressure. The bellows 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.











Switching Differential Adjustment: Model 202 (Fig 4)
1.

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. Note: Rotating the knurled
plastic wheel will alter the operating value on rising
pressure only.

Replace the instrument lid (See maintenance).

Switching Differential Adjustment: Model 203 (Fig 5)
1.

Rotate the secondary adjuster screw to move the
secondary indicator along the "arrow" scale. Rotate
clockwise to increase the differential and counter
clockwise to decrease the differential.

2.

Replace instrument lid (See maintenance).

Note: Rotating the secondary adjuster knob (screw) will
alter the operating value on rising pressure only. For
accurate setting, a suitable pressure gauge should 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.

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























































PRODUCT CODE





ENCLOSURE

MODEL

ELECTRICAL ENTRY

MATERIAL OF WETTED PARTS

RANGE

SWITCHING OPTIONS

PROCESS CONNECTION

OPTIONS AND TREATMENTS

SPECIAL ENGINEERING


On enclosures H, and K, remove the lid using an
appropriate tool if tight e.g. edge of spanner or metal
rod (fig 1A).








































































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 (pulsation’s) are likely then
we recommend that snubbers are fitted between the
process line and switch.

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 60079-0 and IEC 60079-1
BS 5501:Parts 1 and 5: EN50 014 and EN50 018
CENELEC Codes ‘H’ for aluminium and ‘K’ for cast iron
2GD Exd IIC T6


Zone 2 (UK Only)
BS 4683: Part 3, Enclosure Code "N". ExN IIT6

All enclosures are suitable for outdoor use and the majority
of products are rated IP66. Refer to the product label
and/or leaflet. 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 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 5490 IEC 529 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. Before commencing adjustments or
removing the lid, isolate the instrument from process and
power. For opening details see Figs 1A, 6, 7, 8.

Set Point Adjustment: Models 201, 202, 203 (Fig 2)
1.

Loosen the M3 hexagon head locking screw.

2.

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.

3.

Retighten the locking screw taking care not to
overtighten.

4.

Replace the instrument lid (See maintenance).

Set Point Adjustment: Model 281 (Fig 3)
The model 281 provides 2 microswitches which can be set
independently against individual scales using a special
dual beam mechanism. This fulfils the need for HI LO
switching, adjust as follows:
1.

Loosen the rear M3 hexagon head locking screw.

2.

Rotate the rear adjuster screw to move the indicator
on the right hand (LO) calibrated scale. Rotate
clockwise to increase the set point and counter
clockwise to decrease the set point.

3.

Retighten the locking screw.

4.

Loosen the front hexagon head locking screw.

5.

Rotate the front adjuster screw to move the indicator
on the left hand (HI) calibrated scale. Rotate
clockwise to increase the set point and counter
clockwise to decrease the set point.

6.

Tighten the locking screw.

7. Replace the instrument lid (see maintenance)










































ISSUE H 05/09

INSTALLATION, OPERATING AND

MAINTENANCE INSTRUCTIONS FOR

BELLOWS ACTUATED SERIES 200

PRESSURE SWITCHES

(MODELS 201, 202, 203, 281)

SPDT
NC=NORMALLY CLOSED
COM=COMMON
NO=NORMALLY OPEN

2 x SPDT

REAR (LO) FRONT (HI)
SWITCH SWITCH

FIG. 1

350 (13.8)

MIN.

11 (0.43)

25 (1)

5.5 (0.21)

R

To remove lid on enclosures E,H,K,L & M rotate
lid locking mechanism and where lid is tight use
a flat bar (see below) or edge of a ring spanner
to open.

Fig. 1A

ADJUSTER KNOB

LOCKING SCREW

LOCKING PLATE

SCALE PLATE

INDICATOR

FIG. 2

LOCKING SCREW
(HIGH)

FRONT TOP VIEW
OF SWITCHING
MECHANISM

SCALE PLATE
(HIGH)

SCALE PLATE
(LOW)

INDICATOR

LOCKING SCREW
(HIGH)

LOCKINGSCREW
(LOW)

FIG. 3

ADJUSTING
SCREW

ADJUST SWITCHING
DIFFERENTIAL

ADJUSTER KNOB

LOCKING PLATE

SECONDARY
ADJUSTER KNOB

SCALE PLATE

SECONDARY
INDICATOR

INDICATOR

FIG. 5

(SCREW)

FIG. 6

FIG. 7

FIG. 8

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: 002522/201

Registered Office Registered in England No 5369683

FIG.1 shows the state of electrical contacts at
atmospheric pressure.

Note:- products with ranges below atmospheric
pressure have the wiring reversed between the
terminal block and the microswitch(es) to
achieve this state.

M O D E L W & N 2 0 1 , 2 0 2 , 2 0 3 , 2 8 1

M0DELS E, H, K, L, M, 201, 202, 203, 281

FIG. 4

M O D E L A 2 0 1 , 2 0 2 , 2 0 3 , 2 8 1

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This manual is related to the following products:

202, 203, 281