Delta S21 User Manual
RED
RED RED
NC
NO NC
NO NC
NO
2 x SPDT
7 (0.27)
18 (0.7)
sizes below. Material needs to be hard chrome
Rc ¼
DIM A
70
ELECTRICAL
ENTRY
CONN
DIM A
DIM A
154 (6.06)
73 (2.87)
M4 EARTH SCREW
ELECTRICAL
ENTRY
½”NPT
EXT
CENTRES
50 (1.96)
100 (3.93)
(1.96)
NO
FIG.1
shows the state of electrical contacts at atmospheric pressure.
products with ranges below atmospheric pressure have the wiring reversed
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
Process pressure is sensed by a diaphragm that generates
a force proportional to the applied pressure. This force is
opposed by an adjustable spring, which at the point of
equilibrium permits movement of an operating rod that
actuates a switch or switches.
Note: Should the diaphragm fail the process will vent to
atmosphere via a control orifice without pressurising the
switch enclosure.
INSTALLATION
The instruments are designed to be mounted vertically with
the process connection underneath. However, mounting
up to 45° from the vertical in any plane is acceptable,
although a small calibration shift may occur. They can be
mounted either direct to process, or to a wall or panel
using the four mounting holes 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. 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.
Take care to select and install adaptors to the electrical
entry that do not reduce the enclosure degree of
protection.
NOTE: Enclosure Codes H & T for NEMA 4X use.
To ensure performance of enclosure, careful installation
and sealing of cable gland in situ is required.
On enclosures H, R, T and U, remove the lid using an
appropriate tool if tight eg edge of spanner or metal rod (fig
2).
Use a spanner to support the process connection when
fitting the instrument. When fitting the instrument lid make
sure the ‘O’ ring is in good condition and fitted correctly.
On enclosures H, R, T, U, B remove the lid using an
appropriate tool if tight eg edge of a spanner or metal rod
(see fig 2).
WIRING Fig 1A Enclosures H, R, T, U, B
Note:between the terminal block and the microswitch(es) to achieve this state.
To remove lid on enclosures H, R, T, U, B
loosen lid locking device (see fig 8). Where lid
is tight use a flat bar, refer to recommended
steel spanner grade.
The edge of a spanner may be used.
FIG 2
SPDT
NC = NORMALLY CLOSED
COM = COMMON
NO = NORMALL Y OPEN
COM
BROWN
BLUE
SPDT
WIRING Fig 1B Enclosures W, A
R 3.5 (0.13)
REAR FRONT
2 x SPDT
COM
BROWN
REAR
SWITCH
NC = NORMALLY CLOSED
COM = COMMON
NO = NORMALLY OPEN
300 (11.8)
MIN
ALL Dimensions mm (inches)
FIG 1A
COM
BROWN
BLUE
FRONT
SWITCH
FIG 1B
INSTALLATION, OPERATING AND
MAINTENANCE INSTRUCTIONS FOR
DIAPHRAGM ACTUATED SERIES S20
SOVEREIGN PRESSURE SWITCHES
(MODELS S21, S22, S24)
ISSUE L 02/10
PRODUCT CODE
ENCLOSURE
MODEL
ELECTRICAL ENTRY
MATERIAL OF WETTED PARTS
RANGE
SWITCHING OPTIONS
PROCESS CONNECTION
OPTIONS AND TREATMENTS
SPECIAL ENGINEERING
Wire in accordance with local and National codes. Use
cables no larger than 2.5 mm2 (14 AWG). Deliver
electrical connection through a suitable cable gland that
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 /
grounding points provided.
CERTIFIED ENCLOSURES
All series S20 pressure switches can be supplied with
enclosures for use in hazardous areas to the following
standards:
Zone 1 (Div 1) IEC 79-1
BS 50014: 1997 + Amnds 1 and 2, EN 50018:2000
CENELEC. Codes ‘H’ for aluminium EEx d IIC T6, and ‘R’
for stainless steel EExd IIC T6.
ENCLOSURES
H, R, T, U & B
SET POINT
LOCK
FIG 3
ENCLOSURES W & A
SET POINT
ADJUSTER
FIG 4
ADJUSTABLE MICROSWITCH MODEL S22
SET POINT
LOCK
EARTH / GROUND
COM
COM
IN
MIN
MAX
SET POINT
ADJUSTER
MA
EARTH / GROUND
ADJUST SWITCHING
DIFFERENTIAL
FIG 5
FIG. 4
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,
DELTA CONTROLS LIMITED, ISLAND FARM AVENUE, WEST MOLESEY, SURREY KT8 2UZ
T +44 (0) 208 939 3511 F +44 (0) 208 783 1163 E sales@delta-controls.com W www.delta-controls.com
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.
Special Conditions for Safe Use
The apparatus has a specified flame-path gap of 0.1
maximum associated with the push rod and bush
assembly passing through the enclosure wall, which is less
than the maximum permitted by the standard EN
50018:2000 to which the certification is issued. The user
shall ensure that, in service, this flame-path gap does not
exceed this value.
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.
Electrical Adaptors
Use only certified adaptors for Zone 1/Div 1.
1 or 2 electrical entries ISO to BS 3643 (1981) medium fit
6h up to M25 x 1.5 DIN 40430 (1971) up to Pg21. USAS
B2.1 (1968) gauging to clauses 36 & 37 up to 3/4" NPT.
BS conduit to BS31 (1940) table 'A' up to 1" BSP to BS21
(1985) standard threads only as clause 5.4 gauging to
clause 5.2 system 'A' up to Rp3/4 (medium fit or better).
Entry is normally from 1 side. Optional dual entry from
both sides. Cable entry holes are provided for the
accommodation of suitable BASEEFA certified flameproof
cable entry devices, with or without interposition of a
suitable BASEEFA certified flameproof thread adapter.
Unused entries are to be fitted with suitable BASEEFA
certified flameproof stopping plugs. Suitable flameproof
cable entry devices, thread adapters and stopping plugs
certified as equipment (not a component) under an EC
type examination certificate to directive 94/9/EC may also
be used in the manner specified above.
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 EN 60079-14:1997 for Enclosure Codes H and R.
BS EN 50014:1997 + Amnds 1&2, EN 50018:2000 - Codes
H and R.
BS EN 60529:1992 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.
(2.75)
YOUR TRUSTED PARTNER IN PROCESS INSTRUMENTATION
Registered Office Registered in England No 5369683
174 (6.85)
154 (6.06)
FIXING CENTRES
PROCESS
CONN
Rc ¼
¼”NPT INT
½”NPT INT
½”NPT EXT
¼”NPT INT
½”NPT INT
½”NPT EXT
M4 EARTH SCREW
DIM A
36 (1.41)
48 (1.88)
33 (1.29)
45 (1.77)
60 (2.36)
TYPE S21/2
TYPE S24
(0.27)
7
omissions or amendments.
95 (3.74)
41
(1.61)
PROCESS
CONNECTION
51 (2)
W ENCLOSURE
FIG 6
* ADD 12mm (0.47) FOR TYPE S21/2 RANGES CC, CD, CE ONLY SPACERS SUPPLIED LOOSE
140 (5.51)
100 (3.93)
FIXING CENTRES
FIXING
50
PROCESS
CONN
Rc ¼
TYPE S24
¼”NPT INT
½”NPT INT
½”NPT EXT
Rc ¼
¼”NPT INT
½”NPT INT
TYPE S21/2
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 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 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 2, 6, 7, 8.
Set Point Adjustment: Models S21, S22 (Figs 3, 4)
1. Isolate the instrument from the process and power.
2. Loosen lid lock screw and remove the lid.
3. Retain in a safe place to avoid damage to threads.
4. Slacken the set point lock screw.
5. Rotate the set point adjuster screw as required. Rotate
clockwise to increase the set point and counter-clockwise
to decrease the set point.
6. Tighten the set point lock screw.
7. Replace the instrument lid (see maintenance).
Switching Differential Adjustment: Models S22 (Figs 3,
4, 5)
1. Isolate the instrument from process and power.
2. Loosen lid lock screw and remove the lid.
3. Retain in a safe place to avoid damage to threads.
4. Rotate the knurled plastic wheel on the microswitch to
adjust the switching differential. Rotate clockwise to
increase differential and counter-clockwise to reduce
differential.
Note: Rotating the knurled plastic wheel will alter the
operating value on rising pressure only.
5. 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.
CENTRES
ROTATE TO REMOVE
M5 EARTH
FACILITY
ELECTRICAL
ENTRY
MOUNTING HOLES
8 mm (0.31) DIA
LID LOCKING SET SCREW (M4)
LOOSEN TO REMOVE LID
PROCESS CONNECTION
DIM A
36 (1.41)
48 (1.88)
33 (1.29)
45 (1.77)
60 (2.36)
174 (6.85)
FIXING CENTRES
7
(0.27)
PROCESS
Rc ¼
¼”NPT INT
TYPE S21/2
½”NPT INT
½”NPT EXT
Rc ¼
¼”NPT INT
TYPE S24
½”NPT INT
½”NPT EXT
125 *(4.92)
56 *(2.2)
H, R, T, U, B ENCLOSURE
(1.57)
40
36 (1.41)
48 (1.88)
33 (1.29)
45 (1.77)
60 (2.36)
*
103 (4.05)
PROCESS
CONNECTION
A ENCLOSURE
FIG 8
Stock No: 002522/S21
45 (1.77)
53 (2.08)
FIG 7
Machinery Safety Directive MSD
– 2006/42/EC
WIRING
TABLE A
– MICROSWITCH RATINGS
C O D E
U L / C S A
IEC 947
-5-
1 / EN 60947
-5-
1 RATING
D e s i g n a t i o n
VA
R A T I N G
0 . 6 / 0 . 3 A @
A C 1 4 /
AC 4 3 2
7 2
0 . 8 k V
2 5 0
0 . 2 2 / 0 . 1 A @
D C 1 3 /
D C
2 8 2 8
0 . 6 / 0 . 3 A @
A C 1 4 /
A C
4 3 2 7 2
0 . 8 k V
250V
0 . 2 2 / 0 . 1 A @
D C 1 3 /
D C
2 8 2 8
0 4
1 A @ 1 2 5 V A C R E S I S T I V E ( IE C 1 0 5 8
-
1 / E N 6 1 0 5 8
-
1 )
0 . 6 / 0 . 3 A @
A C 1 4 /
AC
4 3 2 7 2
0 . 5 k V
2 5 0 V
0 . 2 2 / 0 . 1 A @
D C 1 3 /
D C
2 8 2 8
0 G
A C 1 4 /
A C
2 1 6 3 6
0 . 5 k V
1 2 5 V
0 . 3 A @ 1 2 0
V A C
0 C
0 . 8 k V
2 5 0 V
0 . 6 / 0 . 3 A @
A C 1 4 /
A C
4 3 2 7 2
0 . 6 / 0 . 3 A @
A C 1 4 /
A C
4 3 2 7 2
0 . 8 k V
250V
0 . 2 2 / 0 . 1 A @
D C 1 3 /
D C
2 8 2 8
0 . 6 / 0 . 3 A @
A C 1 4 /
AC
4 3 2 7 2
0 . 5 k V
250V
0 . 2 2 / 0 .
1 A @
D C 1 3 /
D C
2 8 2 8
REDUCER
M4 SC REW
STRAP
M4 STU D
COIL W ASHER
LID
ENCLO SU RE W ALL
Low Voltage Directive (LVD) – 2006/95/AC. Switch products with enclosure codes ‘W’ and
‘A’ supplied CE-marked must be installed and used in accordance with the main instructions
and this addendum supplied with each product. Products rated lower than 50V ac and 75 V dc
are outside the scope of the LVD, and therefore, do not require CE-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 enclosure codes ‘H’, ‘K’, ‘R’, ‘M’, ‘N’, are covered by
the Explosive Atmospheres Directive ATEX – 94/9/EC and when CE-marked will indicate
compliance with this directive alone. The following directives do not apply to switch products
manufactured by Delta Controls:
Electromagnetic Compatibility EMC – 2004/08/EC
ENCLOSURE ‘W’
Cable Glands and adaptors – 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
nylon M20 cable gland with thread length of 10 mm and locknut. Fit the nylon reducer provided
to the inside and a fibre washer to the outside. See diagram 1.
Alternately, the enclosure may be supplied from the factory with a threaded adaptor ready to
accept the customer’s gland or conduit system.
Alternatives:
i) a metal or nylon adaptor may be used to accommodate other sizes of gland eg NPT, or
conduit system. See diagram 2.
ii) an elbow kit may be supplied to enable the entry to be rotated axially through 90° and
radially through 360°. See diagram 3.
Earthing / grounding – The user must make suitable local earthing arrangements, if required,
to ensure that metal glands are earthed.
An earthing point is provided inside the enclosure. If this is disturbed in any way it must be
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
replaced. See diagram 4.1.
ENCLOSURE ‘A’
Cable Glands and adaptors – Enclosure ‘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
conduit system. See diagram 5.
Earthing / grounding – 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
this is disturbed in any way it must be reassembled correctly to be an effective earth and
prevent ingress. See diagram 4.
EARTHING / GROUNDING OF PROCESS CONNECTION AND BACK PLATES – All the
internal dead metal work is bonded to the enclosure earthing point. Due to requirements of
sealing, the process 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
required, the process connection and back plates may be bonded locally. Never use the
process connection or inlet pipe for locally grounding welding equipment unless it is separately
earth bonded.
WARNING- EXPLOZION HAZARD- SUBSTITUTION OF ANY COMPONENT MAY IMPAIR
SUITABILITY FOR CLASS I, DIVISION 2.
Declaration of Conformity
We: Delta Controls Ltd
Island Farm Avenue
West Molesey
Surrey, UK
KT8 2UZ
As the manufacturers of the apparatus listed, declare under our sole responsibility that the products listed
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.
And thereby conforms to the requirements of the Low Voltage Directive 73/23/EC amended by 93/68/EEC.
………………….
R. Harrison
Managing Director
Original dated 22nd June 2000
Rev. B dated 12
th
August 2009
Signed:
M I C R O S W I T C H
R A T I N G
( R E S I S T IV E )
* S E E N O T E
Uimp
0 0
&
0 1
0 2
&
0 3
&
0 5
0 8
&
0 9
&
0 H
0 D
H 2
&
H 3
&
H 6
S W I T C H
5 A @ 1 1 0 / 2 5 0
V A C
5 A @ 1 1 0 / 2 5 0
V A C
2 A @ 3 0 V D C
1 A @ 1 2 5 V A C
* 1 0 0 m A @ 3 0
V D C
* 5 A @
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
V A C
5 A @ 1 1 0 / 2 5 0
V A C
2 A @ 3 0 V D C
5 A @ 1 1 0 / 2 5 0
V A C
2 A @ 3 0 V D C
The elec trical rati ng is depend ent on the mi c roswitch f itted to
the ins t rument. Th e electri c al rating is define d by each
approva l t hat the mic roswitch c o m plies wit h a nd is shown on
the p roduct nameplate , ie UL / CSA, o r IEC. It should b e
noted that th e s witch must be used withi n t he electrica l r ating
specifi ed fro m th e app r o val you req uire. Tabl e A lists the
actual IEC ratings against the Designation & Utilisation
Catego r y marked on the na m eplate. I n the abs ence of a n y
verific a tion by UL / CSA the micr o switch *manu f a cturer’s
rating i s specifie d in bold i t a l ics. If in d o ubt, seek g u idance
from fac tory.
DIAG 1
LOCKNUT
NYLON 22/20
ENCLOSURE WALL
FIBRE WASHER
PROPRIETARY
GLAND
‘W’ CABLE GLAND ASSY
DIAG 3
GLAND
FIBRE
SCREW
WASHER
DIAG 4.1
M4 NU T
M4 SIN GLE
EARTH STRAP
ENCLOSURE
WALL
O RING
SEAL
ELBOW ASSY
GASK ET
½" NPT Pg 13.5
M20 X 1.5 ¾ ET
Ui
V
M4 PL AIN
WAS HER
EARTH
BASE
( I e I U e )
1 2 0 / 2 4 0 V A C
1 2 5 / 2 5 0 V D C
1 2 0 / 2 4 0 V A C
1 2 5 / 2 5 0 V D C
1 2 0 / 2 4 0 V A C
1 2 5 / 2 5 0 V D C
1 2 0 / 2 4 0
V A C
1 2 0 / 2 4 0 V A C
1 2 5 / 2 5 0 V D C
1 2 0 / 2 4 0 V A C
1 2 5 / 2 5 0 V D C
DIAG 2
‘W’ ADAPTOR ASSY
EARTH LA BEL
SING LE
COIL
WAS HE R
NUT
PLAIN
WAS HE RS
&
U t i l i s a t i o n
C a t e g o r y
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
NUT
STAR W ASH ER
DIAG 5
CABLE GLAND /
CONDUIT ADAPTOR
DIAG 4
(E XT ER IO R)
BONDE D SEAL
EAR THING ASSY
FIBRE WASHER
ENCLOSUREM20 x 1.5
‘A’ ADAPTOR
Make
Bre a k
SCREW
ADAPTOR
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