delta-mobrey Performance Series Installation, Operation & Maintenance Instructions

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
INSTALLED BY SUITABLY TRAINED AND
QUALIFIED
ACCORDANCE
CODES OF PRACTICE SO THAT THE
POSSIBILITY OF FAILURE RESULTING IN
INJURY OR
MISUSE
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).
BE SELECTED
PERSONNEL
WITH APPROPRIATE
DAMAGE CAUSED
OR MISAPPLICATION
www.delta-mobrey.com
IOM-PERFORMANCE-B : SEPT 2019

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
AND
counterweight / vane (refer to fig 1). Position the
IN 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,
BY
ensuring that the screws locate on flat of shaft.
IS
Fig 1