Delta Controls 301 User Manual
All other ranges range c6d, Process, Range c6d
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
AN ‘O’ RING SEAL FAILURE. THIS MUST NOT BE
OBSTRUCTED DURING INSTALLATION. LEAVE
AT LEAST 6 mm 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 BACK PLATE SO AS
TO OBSTRUCT THE BLOW-OUT DISC.
OPERATING PRINCIPLES
A diaphragm is used to sense the difference between
two pressures applied to either side of the diaphragm.
The diaphragm transmits a force proportional to the
applied pressure difference 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 difference the
force applied to the beam also falls, the beam is
restored to its original position by the spring, and the
switch or switches resets.
Switching Differential Adjustment: Model 303 (Fig 4)
1.
Rotate the secondary adjuster knob 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: 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.
Thought 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, K and M remove the lid using an
appropriate tool if tight, eg edge of spanner or a metal rod
(fig 5).
MODELS W, N 301, 303, 381
INSTALLATION
The instruments are designed to be mounted vertically.
They can be mounted either direct to process or to a wall
or panel using the back plate 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 (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
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
2
(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 300 Pressure Difference Switches can be
supplied with BASEEFA certified enclosures 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 and "K" for cast iron.
EExd IIC T6.
Exd IIC T6, or Code ‘M’ Cast Iron Exd I T6 for mining.
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 EN 60529 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.
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 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. Before commencing
adjustments or removing the lid, isolate the instrument
from process and power. For opening details see Figs 5 to
11.
Set Point Adjustment: Models 301, 303, 304 (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 over
tighten.
Replace the instrument lid (see maintenance).
Set Point Adjustment: Models 381, 384 (Fig 3)
The model 381 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 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.
Replace the instrument lid (see maintenance).
ISSUE H 03/10
INSTALLATION, OPERATING AND
MAINTENANCE INSTRUCTIONS FOR
DIAPHRAGM ACTUATED SERIES 300
PRESSURE DIFFERENCE SWITCHES
(MODELS 301, 381, 303, 304, 384)
350 (13.8) MIN
11 (0.43)
25 (1)
5.5 (0.21)
R
DIMENSIONS mm (inches)
Fig 5
To remove lid on enclosures H, K, M rotate lid
locking mechanism and where lid is tight use a flat
bar (see below) or edge of a ring spanner to
recommended size of bar suitable for opening
instrument lid. Material needs to be hard chrome
steel.
S P D T
N C = N O R M A L L Y C L O S E D
C O M = C O M M O N
N O = N O R M A L L Y O P E N
R E A R (L O ) FR O N T (H I)
S W IT C H S W IT C H
2 x S P D T
F ig 1
ADJUS TER KNOB
LOC KIN G S CR EW
LOC KIN G PLAT E
S CALE PLAT E
IND IC AT OR
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
ADJUSTER KNOB
LOCKING PLATE
SECONDARY ADJUSTER
KNOB
SCALE PLATE
SECONDARY INDICATOR
INDICATOR
Fig 4
* INCREASE BY 10mm (0.39)
ON ENCLOSURE N
105 (4.13)
53 (2.08)
DIM B
ALL OTHER
RANGES
RANGE C6D
DIM A
41 (1.61)
95 (3.74)
154 (6.06)
88 (3.46)
DIA C
DIM D
179 (7.04)
113 (4.44)
PROCESS
HP
LP
M4 EARTH
SCREW
ELECTRICAL
ENTRY
CONNECTION
USED ON RANGE C6D ONLY
SPACERS & BOTTOM BRACKETS
*1
5
6
(
6
.1
4
)
61 (2.4)
DIM B
DIM A
154 (6.06)
Fixing Crs
174 (6.85)
75 (2.95)
Fixing Crs
DIM C
DIM D
6.5 (0.25)
1
3
9
(
5
.4
7
)*
*
1
8
3
(
7
.2
)*
*
7 (0.27)
7
0
(
2
.7
5
)
F
ix
in
g
C
rs
1
0
(
0
.3
9
)
7
(0.27)
7
7
(
3
.0
3
)
117 (4.6)
Fig 6
(0.27)
126 (4.96)
113 (4.44)
DIM. E
HP
LP
7
1
0
(
0
.3
9
)
1
1
3
(
4
.4
4
)
F
IX
IN
G
C
E
N
T
R
E
S
8
3
(
3
.3
)
2
1
7
(
8
.5
4
)
14 (0.55)
2
5
2
(
9
.9
2
)
1
9
5
(
7
.6
7
)
63 (2.48)
DIM F
39
(1.53)
156 (6.14)
174 (6.85)
154 (6.06) FIXING Crs.
LID LOCK M4
SOCKET CAP
SCREW
(ROTATE)
M5 EARTH
CONNECTION
ELECTRICAL
ENTRY
PROCESS
CONNECTION
FOR ALL OTHER DIMENSIONS
REFER TO FI G 6
RANGE C6D,
E1D, E8D
ALL OTHER
RANGES
MODELS H, K, 304, 384
FIG 7
H P
L P
B OT TO M B RA CK E T US ED O N
R AN GE C6D O NLY
MO D E L S H , K , 3 01 , 3 03 , 3 81
7
(0 .2 7 )
1 4 (0 .5 5 )
11
3
(
4
.4
4
)
F
IX
IN
G
C
E
N
T
R
E
S
2
2
8
(
8
.9
7
)
1
8
5
(
7
.2
8)
3 9
( 1.5 3 )
1 5 6 (6 .1 4 )
1 74 (6 .8 5 )
1 5 4 (6 . 0 6 ) F IXI NG Crs
8
3
(
3
.3
)
2
0
2
(
7
.9
5
)
F OR AL L O T HER DIM EN SION S
RE F ER T O F IG 6
L ID L O CK M 4
SO CK ET CA P
SC REW
(R OT A T E)
M 5 EAR T H
C ON NEC T ION
EL EC T RICA L
EN TR Y
P RO CE SS
C ON NE CT IO N
FIG 8
HP
LP
103 (4.05)
45 (1.77)
DIM A
RANGE C6D
RANGES
ALL OTHER
DIM B
55 (2.16)
113 (4.44)
DIM B
DIM A
7
7
(
3
.0
3
)
10 (0.39)
7
(0.27)
7
0
(
2
.7
5
)
F
IX
IN
G
C
E
N
T
R
E
S
1
8
3
(
7
.2
)
1
4
1
(
5
.5
5
)
174 (6.85)
154 (6.06)
FIXING CENTRES
1
5
7
(
6
.0
6
)
M4 EARTH SCREW
ELECTRICAL
ENTRY
PROCESS
CONNECTION
FOR ALL OTHER DIMENSIONS
REFER TO FIG 6
SPACERS & BOTTOM BRACKET
USED ON C6D RANGE ONLY
MODEL A 301, 303, 381
FIG 9
FIXING
CENTRES
(0.27)
LP
HP
103 (4.05)
126 (4.96)
53 (2.08)
63 (2.48)
DIM. F
DIM. E
E1D, E8D
RANGE C6D
126 (4.96)
192 (7.55)
DIM. D
DIA. C
100 (3 .93)
166 (6.35)
96 (3.77)
41 (1.61)
DIM. A
RANGES
ALL OTHER
DIM. B
53 (2.08)
107 (4.21)
7
*208
(8.18)
*151
(5.94)
10 (0.39)
7
0
(
2
.7
5
)
F
IX
IN
G
C
E
N
T
R
E
S
7
7
(
3
.0
3
)
DIM. F
DIM. E
DIM. D
DIA. C
6.5 (0.25)
7 (0.27)
75
DIM. B
DIM. A
174 (6.85)
154 (6.06)
FIXING CENTRES
MODELS
W, N 304, 384
1
7
2
(
6
.7
7
)
M4 EARTH
SCREW
ELECTRICAL
ENTRY
PROCESS
CONNECTION
* INCREASE BY 10mm (0.39)
ON ENCLOSURE N
FIG 10
(0.2 7)
CONN ECTIO N
PROCE SS
M4 E AR TH
SC RE W
E LECTRI CAL
E NTRY
E1 D, E8D
RANG E C6D
103 ( 4. 05)
113 ( 4. 44)
55 ( 2. 16)
D I M. B
ALL OTHER
RA NGES
DI M . A
45 ( 1. 77)
1
72
(
6.
7
7
)
7
D IM B
D IM A
7
7
(
3.
0
3
)
1 0 (0 .27)
70
(
2
.7
5
)
F
IX
IN
G
C
E
N
T
R
E
S
1 0 (0 .3 9 )
2
0
8
(
8
.1
8
)
1
5
1
(
5
.9
4
)
17 4 (6 .8 5 )
1 5 4 (6 .0 6 )
FIXING CE NTRE S
FOR AL L OTH ER D IM ENS IO NS
REFE R TO FIG 6
M ODEL A 3 04 , 3 84
FIG 11
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.
Y O U R T R U S T E D P A R T N E R I N P R O C E S S I N S T R U M E N T A T I O N
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: 002522/301
Registered Office Registered in England No 5369683