Emerson FISHER OS2 Instruction Manual

Instruction Manual
D103683X012
June 2017
RELEASE RELAY
CONTENTS
Release Relay (Type OS2) .........................................
Introduction ..................................................................
Mechanism Box (BM) ..................................................
Safety Manometric Box (BMS) ....................................
Characteristics .............................................................
Labelling ......................................................................
Types of Installation .....................................................
Dimensions and Weights .............................................
Mechanism Box (BM) ................................................
Description and Spare Parts ........................................
Operation .....................................................................
Connections .................................................................
Materials ......................................................................
Commissioning ............................................................
Maintenance ................................................................
Options ........................................................................
Safety Manometric Box (BMS) .................................
Description and Spare Parts ........................................
Operation .....................................................................
Connections .................................................................
Spring Adjustment Ranges ..........................................
Materials ......................................................................
Adjustment ...................................................................
Maintenance ................................................................

INTRODUCTION

The Type OS2 Release Relay consists of a Mechanism Box
(BM) and one or two Safety Manometric Boxes (BMS). Its
function is to provoke the activation of a slam shut valve
which may be stand alone (Type OSE), integrated in a
regulator (Types MP, MPS, DRPNPIL, EZH, DRPN and
EZR) or integrated in a Type K1000/K3000, in the case
of under or over pressure in the controlled gas network. It
may be mounted on systems of DN 25 to DN 150 and up to
PN 100.
It is tight shut and submersible. It may be connected to an
explosion-proof contact (intrinsically safe).
1 to 3
1
1
1
2
2
3
3
4 to 8
4
5
6
6
6
7
7
8 to 15
8

MECHANISM BOX (BM)

9
9
The mechanism box is designed to close a slam shut valve.
10
The operation is ensured in two successive stages: a
detection stage and a power stage. The separation between
12
the detection stage and the power stage provides maximum
12
precision, indifferent of working pressure, slam shut valve
diameter and gas flow. After activation of the slam shut valve
14
due to over or under pressure, the mechanism box must
be reset manually. The complete system is available, on
request only, sealed with lead and wire.

SAFETY MANOMETRIC BOX (BMS)

The pressure data is transformed into a displacement by
a safety manometric box (Type BMS 1) mounted on the
mechanism box (BM). This displacement is used to
activate the detection stage of the mechanism box in
the case of overpressure, over or underpressure, or
underpressure condition.
In certain configurations, a second box may be used
(Type BMS 2).
Type OS2
Figure 1. Type OS2