Delta-mobrey Performance Series Guía

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IOM-PERFORMANCE-B : SEPT 2019

Installation, Operation &

Maintenance Instructions

Performance Series

Model 131 (Flow Switch)

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.

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.

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

Flow Switch 131 is vane actuated switch.

The sensing element is a pivoted, counter-weighted

vane, which at its rest position lies at right angles to

the direction of flow. The vane is mounted on a shaft,

which carries two cams that operate one or two

microswitches when the shaft is rotated. When the

nominated flow velocity is reached the vane turns

the shaft enough to operate the switch(es).

Two springs constrain the shaft movement. One

compensates for any gravitational effects on the

vane and for the internal spring setting of the switch

(es). The other determines the amount of flow on the

vane to operate the switch(es). 

INSTALLATION

Mounting (All models)

The instruments may be used on flow in any

direction with the operating shaft horizontal or

vertical. The instrument is supplied with the

microswitch set to operate correctly in relation to

rotation of the operating shaft. Vane and counter

weight are supplied separately. Select the mounting

point so as to avoid excessive shock, vibration or

temperature fluctuations. Install far enough away

from bends, tees or obstructions to avoid non-steady

flow. Instruments should be mounted to avoid

excessive heat transfer from adjacent plant.

Provide aperture in duct large enough to accept

counterweight / vane (refer to fig 1). Position the

vane assembly axially along the operating shaft

which may be adjusted to a maximum of 100 mm

from the mounting plate to the vane centre line by

tightening the M3 socket set-screw provided,

ensuring that the screws locate on flat of shaft.

Fig 1

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IOM-PERFORMANCE-B : SEPT 2019

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.

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, configuration,

fitment method and allowable electrical loads are

limited by the scope of the certification.

NEVER FIT END OF LINE RESISTORS OR

MODIFY WITHOUT REFERENCE TO

DELTA MOBREY

Replacing cover / lid on

Flameproof enclosures

BEFORE CLOSING THE LID:

 ENSURE WIRE IS CLEAR OF ALL

MOVING PARTS.

 ENSURE THAT WIRES DO NOT

TOUCH THE LID AS IT IS CLOSED.

Thread, seal and contact surfaces may be lightly

lubricated using a non-setting non-corrosive grease

compatible with the lid seal.

DO NOT USE COPPER BEARING

GREASE ON ALUMINIUM.

Before connecting to electrical power,

screw on cover/lid hand tight making

sure that mating surfaces of the lid and enclosure

are in contact. Use the locking screw provided to

prevent casual and unauthorised removal of the

cover/lid.

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. NEVER OPERATE THE

UNIT UNLESS THIS CONDITION IS MET.

ATEX

Installation of electrical adaptors and

cable glands to the electrical entry

Either one or two electrical entries can be provid-

ed. The standard entry is a single ISO M20 x 1.5

thread. Other non-ISO and tapered threads will

have their size and type stamped on the enclosure

next to the entry.

TAKE CARE TO SELECT AND INSTALL

ADAPTORS THAT DO NOT REDUCE

THE ENCLOSURE’S DEGREE OF PRO-

TECTION WHEN IN USE IN ZONE 1

HAZARDOUS AREAS.



UNUSED ENTRIES MUST BE FITTED

WITH SUITABLY CERTIFIED FLAME-

PROOF STOPPING PLUGS.





IT IS A SAFETY REQUIREMENT THAT

AT LEAST 5 FULL THREADS ARE EN-

GAGED BETWEEN THE ADAPTER,

CABLE GLAND OR STOPPING PLUG,

AND THE ELECTRICAL ENTRY WHEN

THE UNIT IS IN OPERATION. NEVER

OPERATE THE UNIT UNLESS THIS

CONDITION IS MET.

Alternative electrical entry threads

One or two electrical entries can be supplied with

the following optional thread types:

 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).

Wiring

DISCONNECT ALL SUPPLY CIRCUITS

BEFORE WIRING

WIRE IN ACCORDANCE WITH LOCAL

AND NATIONAL CODES. USE CABLES

NO LARGER THAN 2.5 MM 2 (14 AWG)

DO NOT EXCEED ELECTRICAL RAT-

INGS STATED IN LITERATURE AND ON

NAMEPLATES.

The three switch terminals are clearly marked

“NORMALLY CLOSED”, “NORMALLY OPEN” and

“COMMON”. The following diagram can be used as

a guide for wiring.



ATEX

Fig 2

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IOM-PERFORMANCE-B : SEPT 2019

Changing direction of flow

(Model 131) (See fig. 4, 5):

If when installed the direction of operation is wrong

this can be reversed in situ as follows (refer to figs 4

& 5):

1. Remove springs S1, S2

2. Remove two M3 screws and reassemble plate P

as shown in fig 4.

3. Replace two M3 screws.

4. Replace spring S1 on pin 2.

5. Replace spring S2 on pin 1.



2xSPDT

Both cams are accessible with the enclosure cover

removed and may be adjusted by slackening two M3

hexagon headed screws. Normally the cams are set

to operate each microswitch simultaneously at

approximately 15° from the vertical. This may be

altered in situ if desired to offset the operation of

each microswitch individually or position the

operation of both microswitches for a different vane

angle. However, it is recommended that at least 5°

clearance between operation of microswitches and

stops is allowed for safety. After changing flow

direction, it may be necessary to alter the cam

position, to prevent the cam adjustment screw heads

from hitting the microswitch bodies before the stop

pins hit the stop plate.

OPERATION

THIS UNIT CONTAINS POTENTIALLY

SPARKING CONTACTS. DO NOT

REMOVE THE COVER / LID WHILE

ELECTRICAL POWER IS CONNECTED

TO THE SWITCH AND / OR WHEN A

FLAMMABLE GAS ATMOSPHERE IS

PRESENT.

Each vane assembly is supplied factory counter

weighted and requires no site adjustment. However,

the vane assembly is supplied loose and will require

fitting to the instrument before setting. The

instrument is supplied with the microswitch(es) set

to operate correctly in relation to rotation of the

operating shaft and red springs fitted to give

maximum sensitivity to low flow.

Set point adjustments (Model 131)

(See fig. 4):

Fig 3 gives an indication of flow rates covered by the

2 vane sizes. Reference to this will help select which

vane to fit before setting.

ATEX

1. Isolate the instrument from supply.

2. Remove the instrument lid.

3. Adjust springs as required by rotating the M4

hexagon screws: turn clockwise to increase the

setting and counter-clockwise to reduce setting.

A 7mm A/F spanner will fit these screws

4. Alternative springs are supplied to cover the full

range of operation from 2.5 to 12.5 metres/

second (fig 3). These may be used singly or in

pairs as the user desires, provided the lowest

setting is sufficient to return the vane safely on

no flow. Each spring may be adjusted via an M4

hexagon screw, rotating clockwise to increase

tension and thus reducing flow sensitivity.

Fig 3

Fig 4

Fig 5

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IOM-PERFORMANCE-B : SEPT 2019

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

MOBREY before attempting repair or replacement of

parts.

SPECIAL CONDITIONS FOR SAFE USE

This note relates to flameproof models with ATEX

certification number BAS01ATEX2426X.

The apparatus has a specified flamepath with a

diametrical clearance of 0.1 mm 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

50018-1:2000 to which the certification is issued.

The user shall ensure that, in service, the

diametrical clearance of this flamepath does not

exceed 0.1 mm.

NOTE: Under normal operating conditions where

the process is not continually cycling above and

below the set point, the wear will be minimal. To

examine for wear remove the pressure sensor from

the bottom of the enclosure and examine the rod

and bush assembly for obvious wear. Do not attempt

to remove the assembly and if in doubt seek

assistance from Delta Mobrey.

Model 131

(Flow Pressure Switches)

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