Delta Controls S71 User Manual
Your trusted partner in process instrumentation, Product code
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 closed system containing an equilibrium of liquid and
vapour of a suitable volatile chemical or gas is used to
sense the process temperature. This pressure is
applied to the diaphragm which transmits a force,
proportional to the temperature, to an operating shaft.
The shaft is restrained by an adjustable spring. When
the force on the shaft overcomes the spring load the
shaft moves and operates a switch or switches. On
reduction of the applied temperature the force applied
ot the shaft also falls, the shaft is restored to its
original position by the spring, and the switch resets.
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. 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 & B for NEMA 4X use.
To
ensure
performance
of
enclosure,
careful
installation and sealing of cable gland in situ is
required.
When fitting the instrument lid make sure the ‘O’ ring is
in good condition and fitted correctly.
PRODUCT CODE
ENCLOSURE
MODEL
ELECTRICAL ENTRY
MATERIAL OF WETTED PARTS
RANGE
SWITCHING OPTIONS
PROCESS CONNECTION
OPTIONS AND TREATMENTS
SPECIAL ENGINEERING
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 8).
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.
Capillary version
Mount the sensing bulb so that the capillary end is
above the bulb and the bulb is level with, or no more
than 250 mm below the base of the instrument. The
bulb is fitted with a sliding compression gland to
accommodate different thermowells.
When fitting the instrument lid make sure gaskets and
‘O’ rings are in good condition and fitted correctly.
WIRING Fig 1A Enclosures H, R, T, U, B
WIRING Fig 1B Enclosures A, W
WIRING (Fig 1A & 1B)
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 S70 temperature 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.
Zone 1 Enclosures (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
Temperature switches are supplied calibrated against
falling temperature unless otherwise specified. Set
Point adjustment refers to falling temperature.
Switching differential is the difference between the set
point and the operating value on rising temperature.
Before commencing adjustments or removing the lid,
isolate the instrument from process and power. For
opening details see Figs 5, 6, 7, 8.
Set Point Adjustment: Models S71 (Figs 2 & 3)
1. Isolate the instrument from process.
2. Adjustment may be carried out with the unit live.
3. Loosen both cover screws.
4. Remove the lid to allow access.
5. Using a spanner rotate the adjuster to obtain the
desired setting. Turn right to left to increase the set
point and left to right to decrease the set point. An
approximate setting is shown by the adjuster edge
against a reference scale.
6. Replace cover and tighten screws.
Note: For accurate setting, a suitable temperature
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
ISSUE F 03/10
INSTALLATION, OPERATING AND MAINTENANCE
INSTRUCTIONS FOR VAPOUR PRESSURE
SERIES S70 SOVEREIGN
TEMPERATURE SWITCHES
(MODEL S71)
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
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
MAX
MIN
IN ASE
N.C.
N.C.
N.O.
N.O.
COM
COM
FIG 3
SET POINT
LOCK
SET POINT
ADJUSTER
EARTH / GROUND
350 (13.7)
MIN
R 3.5 (0.13)
7 (0.27)
1
8
(
0
.7
)
FIG 8
All Dimensions mm (inches)
To remove lid on enclosures H, R, T, U, B loosen and rotate lid
locking device (refer to fig). Where lid is tight use a flat bar,
refer to recommended sizes below. Material needs to be hard
chrome steel spanner grade.
The edge of a spanner may be used.
MA
X
FIG 2
SET POINT
ADJUSTER
SET POINT
LOCK
EARTH / GROUND
THREADED ½” NPT EXT
1.8 M
ARMOURED
CAPILLARY
FIG 4
SLIDING COMPRESSION GLAND
THREADED ½” NPT EXT
SEMI RIGID EXTENSION
BULB
75 (2.95)
9
.5
(
0
.3
7
)
D
IA
4
9
(
1
.9
2
)
9.5 (0.37) DIA
2
1
6
(
8
.5
)
ELECTRICAL ENTRY
M4 EARTH
SCREW
FIXING CENTRES
MODEL S71
F
IX
IN
G
C
R
S
SPACERS (SUPPLIED LOOSE
WHEN APPLICABLE)
W ENCLOSURE
FIG 5
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
RANGE
DIM A
DIM B
ALL
RANGES
103
(4.05)
45
(1.77)
ELECTRICAL ENTRY
A ENCLOSURE
M4 EARTH
SCREW
FIXING CENTRES
MODEL S71
F
IX
IN
G
C
R
S
.
SPACERS (SUPPLIED LOOSE
WHEN APPLICABLE)
FIG 6
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
RANGE
DIM A
DIM B
ALL
RANGES
103
(4.05)
45
(1.77)
FIXING CENTRES
MODEL S71
DIM B
DIM A
140 (5.51)
100 (3.93)
5
0
(
1
.9
6
)
5
0
(
1
.9
6
)
FIG 7
DIMENSIONS FOR G UIDANCE ONLY m m (inches)
LID LOCKING SET SCREW (M4)
LOOSEN TO REMOVE LID
MOUN TING HOLES 8 mm DIA
SPACERS (SUPPLIED LOOSE W HEN
APPLICABLE)
ELECTR ICAL ENTR Y
ROTATE TO REMOVE
M5 EARTH
FACIL ITY
H, R, T, U, B ENCLOSURE
RANGE
DIM A
DIM B
ALL
RANGES
136
(5.35)
67
(2.63)
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
W
www.delta-controls.com
Stock No: 002522/S71
Registered Office Registered in England No 5369683