Delta 201 User Manual

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

(HIGH)

(HIGH)

(LOW)

SCREW

INDICATOR

Stock No: 002522/201

FIG.1 shows the state of electrical contacts at

products with ranges below atmospheric

pressure have the wiring reversed between the

terminal block and the microswitch(es) to

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

ADJUSTER KNOB

LOCKING SCREW
LOCKING PLATE

SCALE PLATE

INDICATOR

FIG. 2

LOCKING SCREW
(HIGH)

LOCKINGSCREW

SCALE PLATE

SCALE PLATE
(LOW)

INDICATOR

ADJUSTING

LOCKING SCREW

FRONT TOP VIEW
OF SWITCHING
MECHANISM

FIG. 3

INSTALLATION, OPERATING AND

MAINTENANCE INSTRUCTIONS FOR

BELLOWS ACTUATED SERIES 200

PRESSURE SWITCHES

(MODELS 201, 202, 203, 281)

ISSUE H 05/09

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).

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

atmospheric pressure.
Note:-

To remove lid on enclosures E,

to open.

11 (0.43)

25 (1)

5.5 (0.21)R

In the interest of development and improvement Delta Controls Ltd, reserve the right to amend without notice,

2 x SPDT
REAR (LO) FRONT (HI)
SWITCH SWITCH

MIN.

350 (13.8)

details contained in this publication. No legal liability will be accepted by Delta Controls Ltd, for any errors,

DELTA CONTROLS LIMITED, ISLAND FARM AVENUE, WEST MOLESEY, SURREY KT8 2UZ

T [phone] F [phone] E [e-mail] W www.delta-controls.com

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 MIS­MATCHING 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.

ADJUST SWITCHING
DIFFERENTIAL

FIG. 4

FIG. 1

ADJUSTER KNOB
LOCKING PLATE

SECONDARY
ADJUSTER KNOB

SCALE PLATE
SECONDARY

INDICATOR

(SCREW)

FIG. 5

Fig. 1A

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

FIG. 6

omissions or amendments.

YOUR TRUSTED PARTNER IN PROCESS INSTRUMENTATION

Registered Office Registered in England No 5369683

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. Re­tighten 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)

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

FIG. 7

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

FIG. 8

WIRING

If enclosure ‘W’ is supplied with a through hole of 22 mm

blanked with a blind grommet. Discard the grommet and fit a suitable proprietary brass or

th thread length of 10 mm and locknut. Fit the nylon reducer provided

Alternately, the enclosure may be supplied from the factory with a threaded adaptor ready to

Alternatives:

i) a metal or nylon adaptor may be used to accommodate other sizes of gland eg NPT, or

° and

The user must make suitable local earthing arrangements, if required,

An earthing point is provided inside the enclosure. If this is disturbed in any way it must b

e

reassembled correctly to be an effective earth and prevent ingress. See diagram 4. When

removing the lid slacken the M4 nut first and ensure it is re tightened whenever the lid is

nclosure ‘A’ is supplied with an M20 x 1.5 tapped hole. Use a

suitable stainless steel cable gland and sealing washer. Alternately the enclosure may be

supplied with a threaded adaptor fitted at the factory ready to accept the customer’s gland or

Bonding between the enclosure and gland / adaptor will be achieved

when both parts are screwed together. An earthing point is provided inside the enclosure. If

sembled correctly to be an effective earth and

All the

internal dead metal work is bonded to the enclosure earthing point. Due to requirements of

rocess connection and back plates may be isolated from the earthing point. Do

not, therefore, rely on either for earthing, instead always use the earthing point provided. If

se the

process connection or inlet pipe for locally grounding welding equipment unless it is separately

Pollution degree

r extreme

conditions where condensation may readily form, then sealed contacts should be used. See

These products are not suitable for electrical isolation. Always isolate

C O D E

V A C

REDUCER

‘W’ CABLE GLAND ASSY

M4 SCREW

STRAP

M4 STUD

COIL WASHER

LID

–

Switch products with enclosure codes

marked must be installed and used in accordance with the

main instructions and this addendum supplied with each product. Products rated

han 50V ac and 75 V dc are outside the scope of the LVD, and therefore, do

marking under this directive. The LVD does not apply to products

with enclosure codes ‘H’, ‘K’, ‘R’, ‘M’, ‘N’ for use in hazardous areas. Switch products

with enclosu

re codes ‘H’, ‘K’, ‘R’, ‘M’, ‘N’, are covered by the Explosive Atmospheres

marked will indicate compliance with this

directive alone. The following directives do not apply to switch products

–

As the manufacturers of the apparatus listed, declare under our sole responsibility that the products listed

And thereby conforms to the requirements of the Low Voltage Directive 73/23/EC amended by 93/68/EEC.

Low Voltage Directive (LVD)

‘W’ and ‘A’ supplied CE­lower t

not require CE-

Directive ATEX – 94/9/EC and when CE­manufactured by Delta Controls:

Electromagnetic Compatibility EMC – 2004/108/EC
Machinery Safety Directive MSD

ENCLOSURE ‘W’
Cable Glands and adaptors –

nylon M20 cable gland wi
to the inside and a fibre washer to the outside. See diagram 1.

accept the customer’s gland or conduit system.

conduit system. See diagram 2.
ii) an elbow kit may be supplied to enable the entry to be rotated axially through 90
radially through 360°. See diagram 3.

Earthing / grounding –
to ensure that metal glands are earthed.

replaced. See diagram 4.1.

ENCLOSURE ‘A’
Cable Glands and adaptors – E

conduit system. See diagram 5.
Earthing / grounding –
this is disturbed in any way it must be reas

prevent ingress. See diagram 4.
EARTHING / GROUNDING OF PROCESS CONNECTION AND BACK PLATES –
sealing, the p
required, the process connection and back plates may be bonded locally. Never u
earth bonded.

Declaration of Conformity

We: Delta Controls Ltd
Island Farm Avenue
West Molesey
Surrey, UK
KT8 2UZ

below:
Pressure, Pressure Difference, Temperature & Flow switches series “W” or “A”:

201, 202, 203, 281, 204, 207, 208, 209, 231, 232, 233, 234, S21, S22, S24, GR2, GR4, VM2, VM4.
301, 303, 304, 381, 384, 306, 386, 310, 316, S31, S34, GR3, GR6.
721, 731, 771, 722, 732, 772, 723, 733, 773, 781, 734, 774, 741, 742, 743, 744, S71, GR7.

131.
To which this declaration relates are in conformity with the following relevant standards or parts thereof:
EN 60947-1 :1992 Low voltage switch gear and control-gear-general rules.

EN 60947-5-1:1992 Low voltage switch gear and control-gear-control circuit devices and switching
elements.
EN 60529: 1991 Specification for classification of degrees of protection provided by enclosures.
EN 60950:1992 Safety of information technology equipment including electrical business equipment:
section 2.5.
BS 6134:1991 Specification for pressure and vacuum switches.

………………….

R. Harrison
Managing Director

Original dated 22nd June 2000
Rev. B dated 12

th

August 2009

2006/95/AC.

2006/42/EC

Signed:

Table A codes 08/09, 0G/0H, H2/H3/H6.
Electrical isolation –

circuit separately to carry out any electrical work.

TABLE A – MICROSWITCH RATINGS

0 0

&

0 1

0 2

&

0 3

0 4

&

0 5

0 8

&

0 9

0 G

&

0 H

0 C

0 D

H 2

&

H 3

&

H 6

S W I T C H

M I C R O S W I T C H

( R E S I S T I V E )

* S E E N O T E

5 A @ 1 1 0 / 2 5 0

5 A @ 1 1 0 / 2 5 0

2 A @ 3 0 V D C

1 A @ 1 2 5 V A C

* 1 0 0 m A @ 3 0

1 1 0 / 2 5 0 V A C
5 A @ 3 0 V D C

* 1 A @ 3 0 V A C

& 3 0 V D C

5 A @ 1 1 0 / 2 5 0

5 A @ 1 1 0 / 2 5 0

2 A @ 3 0 V D C

5 A @ 1 1 0 / 2 5 0

2 A @ 3 0 V D C

– all products are suitable for use in pollution degree 3. Fo

U L / C S A

R A T I N G

V A C

0 . 8 k V

V A C

V D C

* 5 A @

0 . 5 k V

0 . 5 k V

V A C

V A C

V A C

IEC 947-5-1 / EN 60947-5-1 RATING

Uimp

0 . 8 k V

Ui

2 5 0

V

2 5 0 V

R A T I N G

( I e I U e )

0 . 6 / 0 . 3 A @

1 2 0 / 2 4 0 V A C

0 . 2 2 / 0 . 1 A @

1 2 5 / 2 5 0 V D C

0 . 6 / 0 . 3 A @

1 2 0 / 2 4 0 V A C

0 . 2 2 / 0 . 1 A @

1 2 5 / 2 5 0 V D C

1 A @ 1 2 5 V A C R E S I S T I V E ( I E C 1 0 5 8 - 1 / E N 6 1 0 5 8 - 1 )

0 . 8 k V

0 . 8 k V

0 . 5 k V

0 . 6 / 0 . 3 A @

1 2 0 / 2 4 0 V A C

2 5 0 V

0 . 2 2 / 0 . 1 A @

1 2 5 / 2 5 0 V D C

1 2 5 V

2 5 0 V

2 5 0 V

2 5 0 V

0 . 3 A @ 1 2 0

0 . 6 / 0 . 3 A @

1 2 0 / 2 4 0

V A C

0 . 6 / 0 . 3 A @

1 2 0 / 2 4 0 V A C

0 . 2 2 / 0 . 1 A @

1 2 5 / 2 5 0 V D C

0 . 6 / 0 . 3 A @

1 2 0 / 2 4 0 V A C

0 . 2 2 / 0 . 1 A @

1 2 5 / 2 5 0 V D C

A C 1 4 /

D e s i g n a t i o n

U t i l i s a t i o n

C a t e g o r y

A C 1 4 /

D C 1 3 /

A C 1 4 /

D C 1 3 /

A C 1 4 /

D C 1 3 /

A C 1 4 /

A C 1 4 /

D C 1 3 /

A C 1 4 /

D C 1 3 /

&

D 3 0 0

R 3 0 0

D 3 0 0

R 3 0 0

D 3 0 0

R 3 0 0

E 1 5 0

D 3 0 0

D 3 0 0

R 3 0 0

D 3 0 0

R 3 0 0

VA

Make

A C 4 3 2

D C

2 8 2 8

A C

4 3 2 72

D C

2 8 2 8

A C

4 3 2 72

D C

2 8 2 8

A C

2 1 6 36

A C

4 3 2 72

A C

4 3 2 72

D C

2 8 2 8

A C

4 3 2 72

D C

2 8 2 8

Break

7 2

Th e electric a l rating is dependent o n the micros wi t c h fitted to
the instrument . The electric a l rating is define d by each
approval tha t the microswitch complies wi t h and is sho wn on
the pro d u c t namep l a te, ie UL / CSA, or IEC. It should be
noted that the switch must be use d w i thin the electrical rati n g
specified from the ap p roval you re q u i re. T a ble A lis t s the
actual IEC r a t i ngs a gainst th e De s i g nation & U til isation
Category ma rk e d on th e n a m e p late. In t he abs e n c e o f any
verification by UL / CS A t h e mi c r o s witch *manufac t u rer’s
rating is s p ecified in b o l d italics . If in dou b t , seek guida n c e
from factor y.

DIAG 1

LOCKNUT

NYLON 22/20

DIAG 3

GLAND

FIBRE

SCREW

WASHER

DIAG 4.1

M4 NUT

M4 SINGLE

EARTH STRAP

ENCLOSURE WALL

FIBRE WASHER

ENCLOSURE

WALL

O RING
SEAL

ELBOW ASSY

GASKET

PROPRIETARY

GLAND

½" NPT Pg 13.5
M20 X 1.5 ¾ ET

M4 PLAIN
WASHER

EARTH

BASE

DIAG 2

‘W’ ADAPTOR ASSY

EARTH LABEL

SINGLE
COIL
W ASH E R

NUT

PLA IN
WASHE RS

DIAG 5

NUT

STA R W A S H E R

ENCLO SUREM20 x 1.5

CABLE GLAND /
CONDUIT ADAPTOR

DIAG 4

ENCLOSURE W ALL
(EXTERIO R )

BONDED S EA L

EARTHING ASS Y

FIBRE W ASHER

ADAPTO R

‘A’ ADAPTO R

SCREW