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Delta Controls S31 User Manual

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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 MISAPPLICATION IS

AVOIDED.

OPERATING PRINCIPLES
A diaphragm is used to sense the difference between
two pressures applied to either side of the diaphragm.
The force is opposed by a control spring, which, at the
point of equilibrium permits movement of an operating
rod that actuates a switch or switches.

INSTALLATION
The instruments are designed to be mounted to a wall
or panel vertically as shown in figs 4, 5, 6, 7, 8, 9 using
the backplates provided. However, mounting up to
45° from the vertical in any plane is acceptable,
although a small calibration shift may occur. 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. To avoid
undue stresses being imparted to the instrument 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 switch.

Use a spanner to support the process connection
when fitting the instrument. DO NOT OVER-
TIGHTEN. 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.
































































































































PRODUCT CODE





ENCLOSURE

MODEL

ELECTRICAL ENTRY

MATERIAL OF WETTED PARTS

RANGE

SWITCHING OPTIONS

PROCESS CONNECTION

OPTIONS AND TREATMENTS

SPECIAL ENGINEERING


WIRING Fig 1A Enclosures H, R, T, U, B

WIRING Fig 1B Enclosures A, W

Wire in accordance with local and National codes.
Use cables no larger than 2.5 mm

2

(14 AWG). 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 S30 pressure switches can be supplied with
enclosures for use in hazardous areas 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 EEx d IIC T6,
and ‘R’ for stainless steel EExd IIC T6.

DIV 1 (NEC 500)
Class I Groups C and D, Class II Groups E, F and G.
Codes ‘T’ for aluminium and ‘U’ for stainless steel.

The above-mentioned enclosures are suitable for
outdoor use rated IP 66 / NEMA 4. 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.

Japanese Zone 1.
Same as CENELEC Zone 1 IEC 79 with additional
label and alternative terminal arrangement. Code ‘B’
for aluminium IIC T6. Refer to appropriate Japanese
standards for guidance on installation and use.

Electrical Adaptors
Use only certified adaptors for Zone 1/Div 1.

WARNING: IT IS A REQUIREMENT OF SAFETY
THAT AT LEAST 5 FULL THREADS ARE ENGAGED
BETWEEN THE ADAPTOR AND CONDUIT ENTRY.

References for Selection and Installation
BS 5345 Part 3 for Enclosure Codes H and R.
BS 5501 Part 1 for Enclosure Codes H and R.
BS 5490 IEC 529 IP RATING (Ingress Protection)
NEC ARTICLE 500 for Enclosure Code T and U.

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.

On enclosures H, R, T, U and B, remove the lid using
an appropriate tool. If tight use edge of a spanner or a
metal rod (fig 4A).































































































Zone 1 Enclosure (H, R, T, U, B)
Thread seal and contact surfaces must be lightly
lubricated using a non-setting non-corrosive grease
compatible with the lid seal. Do not use copper
bearing grease. 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.

Weather-proof Enclosure (W)
If lid gasket is dried out or damaged, replace with new
greased gasket. Make sure gasket aligns correctly
with sealing faces.

Stainless Steel Weather-proof Enclosure (A)
Check gasket. If damaged, replace.

OPERATION
Pressure difference 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. For
opening details see Figs 4, 5, 6.

Set Point Adjustment: Models S31, S34 (Figs 2, 3)
1. Isolate the instrument from process and power.
2. Remove the instrument lid.
3. Slacken the set point lock screw.
4. Rotate the set point adjuster screw as required.
Rotate clockwise to increase the set point and counter-
clockwise to decrease the set point.
5. Tighten the set point lock screw.
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 F 02/10

INSTALLATION, OPERATING AND

MAINTENANCE INSTRUCTIONS FOR

DIAPHRAGM ACTUATED SERIES

S30 SOVEREIGN PRESSURE DIFFERENCE

SWITCHES (MODELS S31 & S34)

N

O

C

O

M

N

C

N

O

C

O

M

N

C

N

O

C

O

M

N

C

B

L

U

E

B

R

O

W

N

R

E

D

R

E

D

B

L

U

E

B

R

O

W

N

R

E

D

B

L

U

E

B

R

O

W

N

REAR FRONT

SPDT

2 x SPDT

NC = NORMALLY CLOSED
COM = COMMON
NO = NORMALLY OPEN

FIG 1A

RANGE

DC, DD, EA

BD, CB, CE

115 (4.52)

57 (2.24)

DIM B

DIM A

45 (1.77)

103 (4.05)

ELECTRICAL ENTRY

FIG 4

M4 EARTH
SCREW

FIXING CENTRES

MODEL S31/S34

F

IX

IN

G

C

R

S

.

SPACERS (SUPPLIED LOOSE
WHEN APPLICABLE)

DIMENSIONS FOR GUIDANCE ONLY mm (inches)

154 (6.06)

174 (6.85)

7

7

(

3

.0

3

)

7

0

(

2

.7

5

)

1

0

(

0

.3

9

)

7

0

(

2

.7

5

)

DIM A

DIM B

W ENCLOSURE

RANGE

DC, DD, EA

BD, CB, CE

115 (4.52)

57 (2.24)

DIM B

DIM A

45 (1.77)

103 (4.05)

ELECTR ICAL ENTR Y

M 4 EARTH
SC REW

FIX IN G C E N TR ES

M OD EL S31/S34

F

IX

IN

G

C

R

S

A E NCLO S URE

SPACERS (SU PPLIED LO OSE
W HEN APPLIC AB LE)

FIG 5

DIM ENSIO NS FO R G UIDA NCE O NLY m m (inc hes)

154 (6.06)

174 (6.85)

7

7

(

3

.0

3

)

7

0

(

2

.7

5

)

1

0

(

0

.3

9

)

7

0

(

2

.7

5

)

D IM A

D IM B

B

R

O

W

N

B

L

U

E

R

E

D

B

R

O

W

N

B

L

U

E

R

E

D

R

E

D

B

R

O

W

N

B

L

U

E

N

C

C

O

M

N

O

N

C

C

O

M

N

O

N

C

C

O

M

N

O

NC = NORMALLY CLOSED

COM = COMMON

NO = NORMALLY OPEN

FRONT

SWITCH

SWITCH

REAR

2 x SPDT

SPDT

FIG 1B

MA
X

FIG 2

SET POINT
ADJUSTER

SET POINT
LOCK

EARTH / GROUND

MAX

MIN

IN
ASE

N

C

N

C

N

O

N

O

C

O

M

C

O

M

FIG 3

SET POINT
LOCK

SET POINT
ADJUSTER

EARTH / GROUND

149 (5.86)

80 (3.14)

RANGE

DC, DD, EA

BD, CB, CE

DIM A

DIM B

FIXING CENTRES

136 (5.35)

67 ( 2.63)

MODEL S31/ S34

DIM B

DIM A

140 (5.51)

100 (3.93)

5

0

(

1

.9

6

)

5

0

(

1

.9

6

)

1

0

0

(

3

.9

3

)

F

IX

IN

G

C

E

N

T

R

E

S

R O TATE TO R EM O VE

M 5 EAR TH

FAC ILITY

ELEC TR IC AL

EN TR Y

M O U NT ING HO LES
8 mm D IA

LID LO C KIN G SET SCR EW (M 4)
LO O SEN TO R EMO VE LID

SPAC ER S (SU PPLIED L OO SE
W HEN APPLIC ABLE)

FIG 6

D IM E N S IO N S FO R G U ID A N C E O N LY

m m (inc h es )

H , R , T, U E N C LO S U R E

D IM E NS IO NS FO R G U ID A NC E O NL Y m m (in c h es )

9 6 (3.7 7)

5 2 (2 .0 4 )

1 21 (4 .7 6 )

6 5 (2.5 5)

17 0 (6 .6 9 )

1 9 5 (7 .67 )

18 0 (7 .0 8 )

2 05 (8 .0 7 )

C OD E J

C OD E H

C O D E A & F

C O DE J

CO D E H

C OD E A & F

DC , DD , EA

BD , C B, C E

RAN GE

FIX IN G CE N TR E S

LP

HP

D IM B

DIM A

15 4 (6 .0 6 )

8 8 (3 .4 6 )

DIM C

D IM D

1 7 9 (7 .04 )

1 1 3 (4 .44 )

P R O CE S S
CO N NE C TION

M O D E L S 3 1

M O D EL S 31

7 (0 .2 7 )

D IM B

D IA A

7 5 (2.9 5)

D IM D

DIM C

5

8

(

2

.2

8

)

4

1

(

1

.6

1

)

8

8

(

3

.4

6

)

FIG 7

C OD E J

CO D E J

CO DE H

COD E H

C OD E A & F

CO D E A & F

182 (7.16)

208 (8.18)

192 (7.55)

218 (8.58)

B D, CB, CE

DC , DD , EA

R ANGE

D IM B

D IM A

166 (6.35)

10 0 (3 .93)

192 (7.5 5)

1 26 (4.96)

63 (2.4 8)

52 (2.04)

126 (4.96)

102 (4.01)

DIM C

DIM D

M O DEL S34

D IM E NS ION S FOR G U ID AN CE ON LY m m (inches)

P ROC ES S
C ONN EC TION

FIX IN G C EN TRE S

HP

LP

75 (2.95)

D IA A

DIM B

D IM C

D IM D

7 (0.27)

5

1

(

2

)

7

3

(

2

.8

7

)

1

0

8

(

4

.2

5

)

FIG 8

MO DE L S34

DIMENSIONS FOR GUIDANCE ONLY mm (inches)

FIG 9

PROCESS
CONNECTION

MODEL S31 RANGE BC

LP

HP

7 (0.27)

75 (2.95)

6

4

(

2

.5

1

)

4

2

(

1

.6

5

)

9

5

(

3

.7

4

)

103 (4.05)

166 (6.53)

350 (13.8)

MIN.

11 (0.43)

25 (1)

5.5 (0.21)

R

To remove lid on enclosures H, R, T, U & B
rotate lid locking mechanism and where lid is
tight use a flat bar (see below) or edge of a ring
spanner to open.

Fig. 4A

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/S31

Registered Office Registered in England No 5369683

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