Delta GR2-4 User Manual

VENTING DEVICE

47

37

FIBRE

FIBRE

WASHER

All enclosures are suitable for outdoor use

NO MODIFICATIONS ARE PERMITTED.

UL and CSA:

Groups A, B, C, D: Class II

Groups E, F,

MO D E L GR 2/4 W IT H TE R M IN AL ENC LOS U R E C O D E J

GENERAL: These instructions are to be
used when installing and operating GR
series pressure switches types GR2 and
GR4.

TYPICAL MODEL NUMBER: W GR2 A
A EA HS F See the switch data plate,
accompanying paper work and / or the
product catalogue for the full definition of
the model(s) you have.

CAUTION: The unit should not be
dismantled without isolating from
pressure source and electrical power.

The microswitch assembly with factory
sealed leads has been carefully
positioned at the factory. Any
disturbance may render this unit
inoperative.

INSTALLATION: Install in such a way as
to avoid stresses, excessive shock or
vibration being imparted to the switch
during operation. It is recommended that
either the process connection or the
electrical conduit connection be flexible
enough to avoid stresses. Always use a
suitable spanner to support the pressure
connection and electrical conduit.

Instruments are designed to be mounted
vertically with the process connection
underneath. However, mounting up to 45 deg
from the vertical in any plane is acceptable,
although a small calibration shift may occur.

The

WIRING: The leads are factory sealed so
it is unnecessary to seal the conduit to the
conduit nipple. However, the leads must
be suitably protected against mechanical
damage and terminated in a suitable
junction box or terminal facility in
accordance with local and national codes.
Refer to the wiring diagram (Fig 1).

Junction Box (when fitted): Some
models may be provided with an integral
weatherproof or EExe junction box. Wire
in accordance with local and national
codes using cables no larger than 14
AWG.

SAFETY: Ensure that site safety
practices and procedures are followed
before working on the installed switch.

DIAG 1

DIAG 2

JUNCTION BOX

CABLE GLAND ASSEMBLY

JUNCTION BOX

WASHER

ADAPTOR ASSEMBLY

INSTALLATION AND OPERATING

GR SERIES PRESSURE SWITCHES

INSTRUCTIONS

TYPE GR2/4

ISSUE I 03/10

PRODUCT CODE

ENCLOSURE

MODEL

ELECTRICAL ENTRY

MATERIAL OF WETTED PARTS

RANGE

SWITCHING OPTIONS

PROCESS CONNECTION

OPTIONS AND TREATMENTS

SPECIAL ENGINEERING

F i g 4

Fig 2 FLYING LEADS CODE ‘A’

To alter the set point:

1. Loosen both cover screws and rotate
cover to allow access.

2.

Using a suitable screwdriver, rotate
the adjuster, right to left to increase
the setting, and left to right to
decrease the setting.

OPERATION: Adjustment of the set point
may be carried out with the unit ‘live’.
Refer to fig 2.

As a guide, one complete revolution of the
adjuster will alter the set point by
approximately 15% of the range. For
accurate setting, a suitable pressure
gauge must be used in conjunction with
the above procedure. Do not attempt to
set the unit outside its range limits.
Though the unit may be set anywhere
within its range, for optimum performance,
it is good practice to have a set point
value between 25% and 75% of the range.

HAZARDOUS AREAS:
CENELEC: Models beginning with code

‘H’ or ‘R’ are also suitable for use in areas
where explosion hazards may exist due to
flammable gases or vapours.

ATEX NUMBER Baseefa02ATEX0214X
EN60 079-0: 2006
EN60 079-1: 2004

II 2G Exd IICT6 (Tamb –40 deg c to +60
deg c) or Exd IIC T4 (Tamb –40 deg c to +85
deg c).

Special condition for safe use
The leads shall be suitably protected against
mechanical damage and terminated in a suitable
junction box or terminal facility

and the majority of products are considered
by Delta controls ltd to be 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.

½” NPT

GROUND

SCREW ‘H’

OR ‘R’

111

4.3

.0

7

MOUNTING

HOLES FOR

M5 SCREWS

AP
PR
O
X

(WHEN FITTED) ‘H’

'A'

OR ‘R’

CONNECTOR

½”NPT MALE

PROCESS

OTHERS

UNITS DIM

INCHES

MM

INCHES

MM

‘A’

1.85

1.46

Fig 3

JUNCTION BOX

CODES ‘C’ & ‘D’

are suitable for installing in areas where
explosion hazards may exist due to
flammable gases or vapours, flammable
liquids or combustible dusts, Class I

All models with flying leads

G: Div 1 and 2, by virtue of the
hermetically sealed microswitch, UL file ref
E105842 and CSA file ref LR 67110-5.
Refer to the National Electrical Code,
Article 500 for installation guidance.

JUNCTION BOXES

Code ‘C’: see fig 3
Code ‘D’: same dimensions as code ‘C’ but
EExe approved for use in Zone 1.
Code ‘J’: see fig 4. EExe approved for use in
Zone 1.
Cert Baseefa03ATEX0089X
Certified II2G EExe II T6
When used at 11A, cabling to be 2.5 mm

2

.

Special conditions for safe use-code J

1) Not more than 1 single or multiple lead shall
be connected into either side of any terminal

2) Leads to be insulated for the appropriate
voltage. Insulation to extend to within 1mm of
the terminal throat.

3) All terminal screws used and unused to be
tightened down

4) Circuits to be protected by excess current
protection, which shall operate within 4 hours at

1.5 X the designed load current.

5) All cable entries shall maintain IP66
minimum

6) Kwikstik 3507 inseal gasket must be fitted
between GR series adaptor and enclosure to
ensure IP66 ingress protection.
When weatherproof junction box code ‘C’ is
fitted the unit must not be used in hazardous
areas unless the circuit or system to which it is
connected is Intrinsically Safe.

Note: Should the diaphragm fail the process
will vent to atmosphere via a control orifice
without pressurising the switch enclosure.
Periodically ensure the vent area does not
Become blocked and the vent plug has not
degraded. Ensure that the vent area is not
obstructed.

MAINTENANCE: No maintenance is normally
necessary with these units. However, if a
junction box is fitted depending on the
installation conditions, it is recommended that
the wiring is checked periodically for
contamination and security. Take appropriate
measures to rectify any faults.

REPLACEMENT PARTS: Use only factory
authorised parts and the fitting instructions that
are supplied with these

WARRANTIES: See CONDITIONS OF SALE.

17

6.7

1.0

3

4 MOUNTING
HOLES 4.5
mm DIA
SUITABLE
FOR M4
SCREWS
MAX HEAD
DIA 7.5 mm

15.

0.5
0

9

45.

1.7
0

7

CONDUIT ENTRY
M20 x 1.5

0.7

20

9

–

cal rating is dependent on the microswitch fitted to the switch.

Low Voltage Directive (LVD)
‘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 – 2004/108/EC
Machinery Safety Directive MSD – 2006/42/EC

2006/95/AC. Switch products with enclosure codes ‘W’ and

WIRING
Junction box cable glands and adaptors. Optional Junction box code ‘C’ and ‘D’ is supplied
with an M20 x 1.5 tapped hole blanked with a red plug. Discard the red plug and fit a
suitable proprietary brass or nylon M20 cable gland with thread length of 10 mm. Fit a fibre
washer to the outside. See diagram 1.
Alternately the junction box may be supplied from the factory with a threaded adaptor ready
to accept the customer’s gland or conduit system.
Alternatives:

1) A metal or nylon adaptor may be used to accommodate other sizes of gland eg NPT, or
conduit system. See diagram 2.

Earthing / grounding – Use earthing point provided inside the junction box (when fitted). The
user must make suitable local earthing arrangement, if required, to ensure that metal glands /
adaptors are earthed.

TABLE A – MICROSWITCH RATINGS

SWITCH

CODE

(type)

HS, HD, HR

HP, HQ, HT

HV, HW,

HY

UL/CSA

MICROSWITCH

RATING

(Resistive)

*See Note

11A @ 110/250 VAC

5/0.5 @ 30/125 VDC

5A @ 250 VAC

2A @ 30 VDC

1A @ 125 VAC

*1A @ 30 VDC

Uimp

0.8kV

0.5kV 250V

0.5kV 120V

Ui RATING (Ie/Ue)

250V

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

0.6/0.3A @ 120/240 VAC

0.22/0.1A @ 125/250VDC

0.6/0.3A @ 120/240 VAC

0.22/0.1A @ 125/250VDC

0.3A @ 120 VAC

Designation

&
Utilization
Category

AC14/D300

DC13/R300

AC14/D300

DC13/R300

AC14/E150

AC

DC
AC

DC
AC

MAKE

432 72

28 28

432 72

28 28

216 36

VA

BREAK

The electri
The electrical rating is defined by each approval that the microswitch
complies with and is shown on the product nameplate, ie UL/CSA or
IEC. It should be noted that the switch must be used within the electrical
rating specified from the approval you require. Table A lists the actual
IEC ratings against the Designation and Utilisation Category marked on
the nameplate. If in doubt, seek guidance from factory.

Pollution degree – all products are suitable for use in pollution degree 3.Ref EN60947-5-1
Electrical Isolation – these products are not suitable for electrical isolation. Always isolate

circuit separately to carry out any electrical work.

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

omissions or amendments.

YOUR TRUSTED PARTNER IN PROCESS INSTRUMENTATION

Registered Office Registered in England No 5369683

Stock No: 002522/GR2