User Manual

ManualsBrandsDelta Controls ManualsRelayT01

002522-SENTRY-C : FEB 2012

www.delta-controls.com

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.

Installation, Operation &

Maintenance Instructions

Sentry Series

Models P0* (Pressure Switches)

Models D0* (Differential Pressure Switches)

Models T0* (Temperature Switches)

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

Pressure Switch models P0* and Differential Pres-

sure Switch models D0* are diaphragm operated

switches.

These diaphragms generate a force proportional to

the applied pressure and are balanced by a user ad-

justable control spring. When the force exceeds that

created by the control spring, the diaphragm moves

causing a push rod to actuate a snap-acting micros-

witch.

Temperature models T01 & T02 work in the same

way as the Pressure models with the exception that

the applied pressure comes from the expansion of a

vapour enclosed in either a rigid stem or semi-rigid

thermal system.

occur. They can be mounted either direct to process,

or to a wall or panel using the mounting holes provid-

ed. Select the mounting point so as to avoid exces-

sive shock, vibration or temperature fluctuation.

Instruments should be mounted to avoid excessive

heat transfer from the process lines or adjacent plant.

To avoid undue stresses being imparted to the instru-

ment when wall/panel mounted, it is recommended

that a short length of flexible line be installed between

the instrument and process line. If sudden changes of

pressure (pulsations) are likely then we recommend

that snubbers are fitted between the process line and

instrument. Use a spanner to support the process

connection when fitting the instrument.

CHECK THE CONNECTION THREAD SIZE

AND SPECIFICATION ON THE UNIT TO

AVOID MIS-MATCHING WITH THE PROCESS

CONNECTION ADAPTOR. SEE DIGIT 11 OF

PRODUCT CODE.

Mounting (T01 - Rigid Stem)

Assemble the unit via a thermowell, using the

spanner facility provided and ensuring that:

a) the sensing bulb is fully immersed in the

process temperature

b) the sensing bulb does not bottom out in the

thermowell which could cause damage

Mounting (T02 - Capillary system)

Mount the sensing bulb so that the capillary end is

above the bulb and the bulb is level with, or no more

than 250mm below the base of the instrument. The

stem is fitted with a sliding compression gland to

accommodate different thermowells.

Wiring

DISCONNECT ALL SUPPLY CIRCUITS

BEFORE WIRING

WIRE IN ACCORDANCE WITH LOCAL AND

NATIONAL CODES. USE CABLES NO

LARGER THAN 2.5 MM

(14 AWG)

DO NOT EXCEED ELECTRICAL RATINGS

STATED IN LITERATURE AND ON

NAMEPLATES.

INSTALLATION

Mounting (All models)

The instruments are designed to be mounted vertically

with the process connection underneath. However,

mounting up to 45° from the vertical in any plane is

acceptable, although a small calibration shift may

Summary of content (4 pages)

PAGE 1
002522-SENTRY-C : FEB 2012 Installation, Operation & Maintenance Instructions Sentry Series Models P0* (Pressure Switches) Models D0* (Differential Pressure Switches) Models T0* (Temperature Switches) 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 li
PAGE 2
002522-SENTRY-C : FEB 2012 BEFORE CLOSING THE LID: Ÿ ENSURE WIRE IS CLEAR OF ALL MOVING PARTS. Ÿ CHECK THAT THE GASKET IS SEATED CORRECTLY AND IN GOOD CONDITION Ÿ ENSURE THAT WIRES DO NOT TOUCH THE LID AS IT IS CLOSED Wiring (continued...) Undo the single lid retaining screw and allow the hinged lid to rest in an open position. Be careful not to apply excessive pressure on the opened lid to avoid damage to the hinge. IF HINGE IS DAMAGED, INGRESS PROTECTION LEVEL COULD BE COMPROMISED.
PAGE 3
002522-SENTRY-C : FEB 2012 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. Check that the gasket is seated properly in the lid recess and is not worn.
PAGE 4
002522-SENTRY-C : FEB 2012 Declaration of Conformity In accordance with EN ISO 17050-1:2004 We Delta Controls Ltd of Island Farm Avenue, West Molesey, Surrey, KT8 2UZ, UK in accordance with the following Directive(s) 2006/95/EC Low Voltage Directive 94/9/EC ATEX Series Sentry Models P01, P02, P03, D01, D02, D03, T01, T02 hereby declare that: are in conformity with the applicable requirements of the following documents for LVD EN 60947-1:2007 Low-voltage switchgear and controlgear.