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Wiring - when Junction Box is fitted
(See Fig. 3)
Some models may be provided with an integral
weatherproof or Ex junction box.
WIRE IN ACCORDANCE WITH LOCAL
AND NATIONAL CODES. USE CABLES
NO LARGER THAN 2.5 MM 2 (14 AWG)
ATEX
Insert bare wires fully into the terminal block and
tighten securely. Keep wiring tails to a minimum.
End of line resistors
Some products may be supplied to order fitted with
end of line resistors. Resistors in use may generate
a heat source. The type, quantity,
fitment method and allowable electrical loads are
limited by the scope of the certification.
NEVER FIT END OF LINE RESISTORS OR
MODIFY
WITHOUT
DELTA MOBREY
ATEX
Replacing cover on Flameproof
enclosures
Before connecting to electrical power, screw on
cover hand tight making sure that mating surfaces of
the lid and enclosure are in contact. Use the locking
screws provided to prevent casual and unauthorised
removal of the cover.
DO
NOT
LUBRICANTS NOT COMPATIBLE WITH
THE
ENVIROMENT,
ALUMINIUM.
ATEX
IT IS A SAFETY REQUIREMENT THAT AT
LEAST 5 FULL THREADS ARE ENGAGED
BETWEEN THE COVER / LID AND THE
ENCLOSURE WHEN THE UNIT IS IN
OPERATION.
ATEX
UNIT UNLESS THIS CONDITION IS MET.
Fig 4
configuration,
REFERENCE
TO
USE
GREASES
OR
PROCESS
OR
NEVER OPERATE THE
www.delta-mobrey.com
OPERATION
Adjustments
Pressure and Temperature Switches are supplied
calibrated at the midpoint of their range and to a
falling pressure or temperature unless otherwise
specified.
Set point adjustments (All Models)
(See fig. 4)
1. Isolate the instrument from process and power
(Adjustment may be carried out with the unit live)
2. Loosen both cover screws
3. Rotate cover anti-clockwise to allow access.
4. Using a screwdriver, rotate the range adjuster to
obtain the desire setting. Turn right to left to
increase the setting. An appropriate setting is
shown by pointer against reference scale.
5. Rotate cover clockwise to close and tighten
screws.
As a guide, one complete revolution of the adjuster
will alter the set point by approximately 15% of the
range.
Note: For accurate setting of Pressure and
Differential Pressure models, a suitable pressure
gauge must be used in conjunction with the above
procedure. Do not attempt to set the switch outside
the scale limits. For Temperature models a suitable
calibrated temperature source should be used.
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
span.
IOM-GR-B : SEPT 2019
:
Fig 5
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