Emerson Fisher OS2 User manual

Type OS2
Instruction Manual
D103683X012
June 2017
RELEASE RELAY
CONTENTS
Release Relay (Type OS2) ......................................... 1 to 3
Introduction .................................................................. 1
Mechanism Box (BM) .................................................. 1
Safety Manometric Box (BMS) .................................... 1
Characteristics ............................................................. 2
Labelling ...................................................................... 2
Types of Installation ..................................................... 3
Dimensions and Weights ............................................. 3
Mechanism Box (BM) ................................................ 4 to 8
Description and Spare Parts ........................................ 4
Operation ..................................................................... 5
Connections ................................................................. 6
Materials ...................................................................... 6
Commissioning ............................................................ 6
Maintenance ................................................................ 7
Options ........................................................................ 7
Safety Manometric Box (BMS) ................................. 8 to 15
Description and Spare Parts ........................................ 8
Operation ..................................................................... 9
Connections ................................................................. 9
Spring Adjustment Ranges .......................................... 10
Materials ...................................................................... 12
Adjustment ................................................................... 12
Maintenance ................................................................ 14
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).
MECHANISM BOX (BM)
The mechanism box is designed to close a slam shut valve.
The operation is ensured in two successive stages: a
detection stage and a power stage. The separation between
the detection stage and the power stage provides maximum
precision, indi󰀨erent of working pressure, slam shut valve
diameter and gas flow. After activation of the slam shut valve
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).
Figure 1. Type OS2

BMS
PSD BMS
N°
Fisher
AG maxi
Taille
Size
Série
Serial
Ressort/Spring Ø
bar
bar
mm
1
BMS
PSD BMS
N°
AG maxi
Taille
Size
Série
Serial
Ressort/Spring Ø
Wdsu
bar
bar
mm
1
Wdso
BMS
PSD BMS
N°
AG maxi
Taille
Size
Série
Serial
Ressort/Spring Ø
Wdsu
bar
bar
mm
1 2
Fisher
Fisher
Type OS2
2
CHARACTERISTICS
Accuracy AG 2.5 Diaphragm or bellows
AG 5 Piston
Memorization No memorization
Resistance to vertical shocks 4 J (20 shocks)
Resistance to pendular shocks 9.81 J
Sealing IP 67 Temporary immersion
Maximum operating pressure (PSD) 100 bar
Operating temperature -30°C to +71°C
Maximum valve travel 50 mm
Table 1.Type OS2 Pressures
Size 162 071 027 017 236 315
PSD 10 bar 20 bar 100 bar 100 bar 35 bar 72 bar
AG max. 2.5 2.5 5 5 2.5 2.5
Connections
Table 2.Connection Types
Non connectable Plastic vent with screen 1/4" NPT
Connectable Link 8/10 tube
Contact Box exit 1/2” NPT
LABELLING
Figure 2.Max. Pressure Triggering Figure 3. Min. Pressure Triggering
Figure 4.Max. and Min. Pressure Triggering
See Table 1 See Table 1
See Table 1
See Table 1 See Table 1
See Table 1
See Table 1 See Table 1
See Table 1
See Tables 14, 15 and 16 for other values.

185
120
A A
134
B
166
B
BM 2
BM 1
BM 2
Type OS2
3
N01
N02
N03
N05
N04
TYPES OF INSTALLATION
Mounting on horizontal pipeline only:
Top Mounted (stand-alone valve) Bottom Mounted (intergrated valve and regulator)
Figure 6.BM 1: Mechanism Box with
One Safety Manometric Box (Type BMS 1)
Figure 5. BM 1: Mechanism Box with
One Safety Manometric Box (Type BMS 1)
Figure 7. BM 2: Mechanism Box with Two Safety
Manometric Boxes (Types BMS 1 and BMS 2)
Figure 8.BM 2: Mechanism Box with Two Safety
Manometric Boxes (Types BMS 1 and BMS 2)
Figure 9. Dimensions
DIMENSIONS AND WEIGTHS
Table 3.Dimensions and Weights
Type
Dimensions, mm
Weight, kg
A B
BM
BM1 For 1 BMS
- - - -
2.5
BM2 For 2 BMS 2.5
BMS
162 Diaphragm 181 83 2.6
71 Diaphragm 175 36 1.2
27 or 17 Piston 204 36 2.3
236 Bellows 202 36 2.4
315 Bellows 223 36 2.8
For a Type OS2 with one BMS add the weight of the BMS to that of the BM 1.
For a Type OS2 with two BMS add the weight of the two BMS to that of the BM 2.
BM1
TYPE BMS 1
TYPE BMS 2 TYPE BMS 1
TYPE BMS 2
TYPE BMS 1
TYPE BMS 1
TYPE
BMS 2
TYPE
BMS 1

79
5
3
2
1
8
6
4
AB
C
79
5
3
2
1
8
6
4
AB
C
Type OS2
4
N06
DESCRIPTION AND SPARE PARTS (BM)
Table 4. Mechanism Box Assembly
Item Description BM1 BM2
Mechanism box FA181067T12 FA181068T12
1Cap including indicator, O-ring and screw (new version 06/2007; interchangeable) FA181328T12
New cap O-ring FA145430X12
2 Mechanism box casing FA142930X12* FA144071X12
3
Box gasket FA142930X12*
BMS gasket FA145431X12*
BMS screw FA402018X12*
BMS sealing screw O-rings FA461150X12*
4Non-connectable brace vent 27A5516X012
Vent link for 8 x 10 tube FA406526X12
5 Yoke FA181042X12
6
Fixed bolt axe (do not dismount) FA142920X12
Bolt FA181043X12
Truarc O-ring FA406128X12
7Travel stop FA140324X12
Damper FA127692X12
8Mechanism FA181041X12
Mechanism screw FA402512X12
9 Resetting tool FA242915T12
* Sold as a set ref. n° FA197351X12.. Items in bold are spare parts.
Figure 10. Mechanism Box for One BMS Figure 11. Mechanism Box for Two BMS

84
ø 24
ø 7
ø 24
Type OS2
5
N07
N08
Table 5. Packing Gland Assembly
Description
Packing gland
Valve
Type OSB Type VSE Standard
Assembly FA181089X12 FA181090X12 FA181104X12
Packing gland and stem FA181040X12 - - - - FA181040X12
Packing gland - - - - 144 126 - - - -
O-ring FA400514X12 FA400505X12 FA400514X12
O-ring - - - - FA400221X12 - - - -
Fastening screw H M7 FA402028X12 - - - - FA402028X12
Fastening screw H M8 - - - - FA402036X12 FA402036X12
Flat washer (key 7) FA405005X12 - - - - FA405005X12
Flat washer (key 8) - - - - FA405006X12 FA405006X12
Items in bold are spare parts.
Figure 12. Standard Packing Gland Figure 13. Type VSE Packing Gland
OPERATION (BM) (FIGURE 14)
The detection stage consists of two parts:
• The releasing stem (key 1)
• The 1st stage trigger (key 2).
Through the intermediate of the safety manometric box
(BMS), the pressure provokes a pin movement (D1 or D2),
which provokes the rotation of the releasing stem (key 1)
and frees the 1st stage trigger (key 2).
The power stage consists of two parts:
• The 2nd stage trigger (key 3)
• The cam (key 4).
The 2nd stage trigger (key 3), activated by the 1st stage
trigger (key 2), frees the cam (key 4), which provokes
the valve to close. After release, the resetting is ensured
in two stages: (detection stage, then power stage) see
«commissioning».
Position indicator
The position of the detection stage can be seen through the
position indicator glass.
Memorization
The releasing stem will only start moving when pressure
approaches the pressure setpoint. In all other cases, it
remains xed. Furthermore the assembly has a very high
resistance to shocks. If pressure approaches the setpoint,
the releasing stem turns, but with the slightest shock or
vibration it will go back to its initial position and pressure
returns to normal. The mechanism is said to be non
memorizing.
Resistance to shocks
This assembly has a remarkable resistance to shocks (20
vertical shocks of 4 J and 20 pendular shocks of 9.81 J),
with pressure close to setpoint (for example: 186 mbar for a
setpoint of 200 mbar).

D1
D2
2
3
4
1
Type OS2
6
N09
!
CONNECTIONS (BM)
• Fixation BM / Connector:
- H M7 or H M8 screws
- 16 N•m torque
• Sealed BM / Connector:
- Flat O-ring (water resistant)
- Packing gland (gas resistant)
• Mechanism contact / Slam shut valve:
- Control rod
• BM connector / atmosphere:
- Integrated vent nipple with screen (supplied) or
compression fitting (supplied) for 8/10 tube
(not supplied)*
• Electrical connections:
See table 9
* The 8/10 tube should be angle-shaped on the top to avoid water from entering.
MECHANISM BOX (BM) MATERIAL
Table 6.Mechanism Box (BM) Material
Figure 14. Mechanism Details
Box
Body Aluminum Chromatation
Cover Aluminium Chromatation
Position indicator Polycarbonate
Self-jamming ring Steel Phosphatation
Cover nut Stainless steel
Circlips Steel Phosphatation
Mechanism
All parts Stainless HR
Brackets Brass
Bolt Brass
Elastic O-ring Steel Phosphatation
Torsion spring Stainless steel
Traction spring Bronze
Yoke Self-jamming ring Steel Phosphatation
O-rings
Flat EPDM
Cover Neoprene (CR)
Truarc ring Nitrile (NBR)
Table 7. Packing Gland Material
Body Bronze
Control rod Stainless steel Chromium plating
Truarc ring Nitrile (NBR)
CAUTION
WARNING
COMMISSIONING (BM)
AUTHORIZED PERSONNEL ONLY
Risk of injury
After rearming, remove the reset key from
the stem. Do not put fingers in or near the
reset mechanism area.
Never use an extension pipe with the reset key
when resetting the 2nd stage (max. normal
torque 16 N•m, never go over 32 N•m).
Commissioning di󰀨ers depending on whether the assembly
has an internal or external bypass and whether overpressure
releasing is required or not. See corresponding technical
manuals for further details.
Note
The position of the travel stop (Figure 10, key 7)
depends on the type of assembly and its size.
Position A, B or C depending on max. travel of slam
shut valve: A = 15 mm travel, B = 35 mm travel,
C = 50 mm travel.
• Mechanism box (BM) intervention
To access the box the cover must be removed. When
unscrewing the nut a circlips is used to remove the O-ring.
The cover is held on by one screw which can be unscrewed
manually or using a socket screw key (recommended torque
for optimal shuto󰀨: 6 N•m).
• Resetting
To reset the slam shut (after the fault has been settled), the
1st mechanism stage must be reset by manually turning the
1st stage trigger. If the slam shut has an internal bypass the
VALVE
TRAVEL STOP

Type OS2
7
N10
N11 N12
cam must be slightly turned using a resetting key to bypass.
If the slam shut has an external bypass, a bypass valve will
be used. In both cases:
- Wait for the pressure to be equalized before resetting
the 2nd mechanism stage.
- When resetting the 2nd mechanism stage (opening of
the valve) a reset key is used (delete).
MAINTENANCE (BM)
Tools:
• Spanner 11 (screw 7) and 13 (or 14) (screw 8)
• Screwdriver
Control:
• 1st and 2nd stage mechanism releasing
• Packing gland is tight shut
• Yoke greasing
Disassembly:
• Check that assembly is not under pressure
• Manual release of slam shut (Figure 14)
• Manually press on the releasing stem pin D1 or D2
(Figure 14, key 1) parallel to the BMS axe
• Unscrew the travel stop (screwdriver)
• Unscrew the BM fastening screws (at spanner 11
(screw 7) and 13 (or 14) (screw 8)
• Disassemble the mechanism box (BM) from the connector
by unlocking the yoke
Assembly :
• Proceed in reverse order to disassembly
RESET DETECTION STAGE
CLOSED POSITION
RESET POWER STAGE
Figure 15. Release Activation Stages
VALVE
VALVE VALVE
OPTIONS (BM)
• Remote alert (on BM1 or BM2)
Detects 2nd stage releasing (power)
• Remote control
Atmospheric solenoid valve (releasing by min. pressure)
for max. releasing pressure of 30 bar. Safety manometric
box (BMS) activated with a pneumatic or electro-
pneumatic impulse.
• Manual control on BM2 with 1 Type BMS 1 only
Push button (connected at the same place as a
Type BMS 2).
• Contact
Table 8. Mechanism Box (BM) Contact
AC DC
Max. intensity 7.0 A 0.8 A
Max. tension 400 V
250 V
Protection EEx-d IIC T6
Tightness IP 66
Temperature - 29° C + 71° C
Fastening 2 M3 screws
Cable 3 wires (black, brown, blue) H05VVF
(3 x 0.75 mm²) D 6.5 mm
TRAVEL STOP
TRAVEL STOP TRAVEL STOP

BK
BU
BN
A
B
C
NF --> BK(A)/BU(B)
NO --> BK(A)/BN(C)
WIRING
BK
BU
BN
NF --> BK/BU
NO --> BK/BN
WIRING
BK
BU
BN
123456
NF --> BK(3)/BU(4)
NO --> BK(3)/BN(5)
WIRING
BK
BU
BN
NF --> BK/BU
NO --> BK/BN
WIRING
Type OS2
8
N19
N20
D2
D1
N21
D2
D1
N14 N15 N13
3 m
Table 9.Mechanism Box (BM) Versions
Versions Installation Sealing Connection Mechanical Connections
Electrical Connections
Common NF NO Connection
C0 IP 68 Sans 1/2 NPT cap
C1 ADF IP 68 ADF 3 m wire Black Blue Brown Wires
C2 ADF IP 65 ADF Explosion proof connector box/PE 3 4 5 Screwed wiring
C3 SI IP 68 ADF Intrinsical safe tight-shut connector A B C Welded wiring
Figure 16. Dierent Versions of BM Connections
SAFETY MANOMETRIC BOX (BMS)
DESCRIPTION AND SPARE PARTS
• Impulse line
The impulse line (IS) is connected to the network to be
protected (normally downstream of the regulator).
• Impulse type
Depending on the pressure and precision required,
different types of impulse may be used: Diaphragm,
Piston or Bellows.
• Springs
To cover all pressure ranges, a set of springs of equal
length and diameter, but of different wire diameter (2 to
6.5 mm), may be used.
• Detection
Table 10.Detection Configurations
Actioner Max.
only
Min.
only
Max. &
Min.
One
BMS
BMS
1
Releasing screw Active Neutral Active
Hook Neutral Active Active
Two
BMS
BMS
1
Releasing screw Active - - - - - - - -
Hook Neutral
BMS
2
Push button Active Neutral Active
Hook Neutral Active Active
Version C3 connection
Explosion proof connection
with sealed connector for intrinsic safe
Version C2 connection
Explosion proof connection
with explosion proof connector box
Version C1 connection
Explosion proof connection with cable
and tight-shut packing gland
NF : Normally closed
NO: Normally opened
Figure 17. Type BMS 1 Max. Only
Figure 18. Type BMS 1 Min. Only
Figure 19. Type BMS 1 Max. - Min.

Type OS2
9
N16 N17 N18
Figure 20. BMS with Diaphragm Figure 21. BMS with Piston Figure 22. BMS with Bellows
Table 11.Spare Parts
Description Diaphragm (Max. and/or Min.) Piston (Max. or Min.) Bellows (Max. and/or Min.)
162 71 27 17 236 315
Type BMS 1
Compete box FA181071X12 FA181072X12 FA180999X12 FA180998X12 FA181073X12 FA181074X12
Base FA181105T12 FA181106T12 FA181107T12 FA181108T12 FA181109T12 FA181110T12
Hook kit FA181111T12
Type BMS 2
Compete box FA181084X12 FA181085X12 FA181070X12 FA181069X12 FA181086X12 FA181087X12
Base FA181105T12 FA181106T12 FA181107T12 FA181108T12 FA181109T12 FA181110T12
Hook kit FA181112T12
Spare Parts Kits Diaphragm FA137906X12 FA142549X12 - - - - - - - - - - - - - - - -
Set of O-rings - - - - FA197352X12 - - - -
OPERATION (BMS)
The pressure of the network to be protected pushes the
diaphragm, piston or bellows. The force resulting from this
opposes the force (adjustable) coming from the setpoint
spring. When pressure varies, the detection rod moves and
provokes releasing by max. or min. pressure.
CONNECTIONS (BMS)
On the mechanism box: 2 H M6x16 screws
(code FA402018X12)
BM sealing: Flat O-ring and tight shut O-rings
On the manometric box: 1/4" NPT screw
Recommended tube: 8/10 mm
The sensing line must be connected downstream of the regulator.
Table 12.Max. Pressure Releasing
Pressure Type BMS 1 Type BMS 2
Releasing screw Push button
Normal Without D1 pin contact Without D2 pin contact
Increase With D1 pin contact With D2 pin contact
= Setpoint Rotation of releasing stem and 1st stage trigger
Table 13.Min Pressure Releasing
Pressure Type BMS 1 Type BMS 2
Hook Hook
Normal Without D2 pin contact Without D1 pin contact
Decrease With D2 pin contact With D1 pin contact
= Setpoint Rotation of releasing stem and 1st stage trigger
SAFETY
MANOMETRIC
BOX (BMS)
BASE
SAFETY
MANOMETRIC
BOX (BMS)
BASE
SAFETY
MANOMETRIC
BOX (BMS)
BASE
SAFETY
MANOMETRIC
BOX 1 (TYPE BMS 1)
“HOOK” KIT
SAFETY
MANOMETRIC
BOX 1 (TYPE BMS 1)
“HOOK” KIT
SAFETY
MANOMETRIC
BOX 1 (TYPE BMS 1)
“HOOK” KIT
SAFETY
MANOMETRIC
BOX 2 (TYPE BMS 2)
“HOOK” KIT
SAFETY
MANOMETRIC
BOX 2 (TYPE BMS 2)
“HOOK” KIT
SAFETY
MANOMETRIC
BOX 2 (TYPE BMS 2)
“HOOK” KIT

Type OS2
10
SPRING ADJUSTMENTS RANGES (BMS)
(See definitions table 17)
Table 14.Max. Only Spring Adjustment Ranges
MAX. ONLY
BMS SPRING MAX. ONLY INTERVALS
∆1
Type Size PMS box
(bar)
ø Wire
(mm) Code
Wdso setting, bar
Max. low
point
possible
Recommended range
∆1
(bar)
Max. low
point
Max. high.
point
Diaphragm
162 10
2.0 FA113195X12 0.010 0.015 0.035 0.004
2.5 FA113196X12 0.025 0.040 0.080 0.005
3.0 FA113197X12 0.045 0.080 0.140 0.010
3.5 FA113198X12 0.070 0.070 0.240 0.014
4.0 FA113199X12 0.115 0.140 0.380 0.018
5.0 FA113201X12 0.140 0.300 0.750 0.050
5.5 FA113202X12 0.250 0.600 1.3 0.080
6.5 FA114139X12 0.450 1.2 2.3 0.170
071 20
4.5 FA113200X12 1.0 2.0 5.1 0.350
5.5 FA113202X12 2.1 4.0 11.0 0.700
6.5 FA114139X12 4.0 8.0 16.0 1.6
Piston
027 100 5.5 FA113202X12 16.0 16.0 22.0 3.0
6.5 FA114139X12 22.0 22.0 40.0 6.5
017 100 5.5 FA113202X12 40.0 40.0 55.0 7.0
6.5 FA114139X12 55.0 55.0 100.0 12.0
Bellows 236 35 5.5 FA113202X12 5.5 11.0 22.0 1.6
6.5 FA114139X12 8.3 16.0 35.0 2.5
315 72 5.0 FA113201X12 17.5 35.0 72.0 5.0
Table 15.Min. Only Spring Adjustment Ranges
MIN. ONLY
BMS SPRING MIN. ONLY INTERVALS
∆1
Type Size PMS box
(bar)
ø Wire
(mm) Code
Wdsu setting, bar
Min. low
point
possible
Recommended range
∆1
(bar)
Min. low
point
Min. high.
point
Diaphragm
162 10
2.0 FA113195X12 0.010 0.015 0.035 0.004
2.5 FA113196X12 0.025 0.040 0.080 0.005
3.0 FA113197X12 0.045 0.080 0.150 0.010
3.5 FA113198X12 0.070 0.070 0.240 0.014
4.0 FA113199X12 0.115 0.150 0.400 0.018
5.0 FA113201X12 0.140 0.300 0.650 0.050
5.5 FA113202X12 0.250 0.600 1.15 0.080
6.5 FA114139X12 0.450 1.1 2.0 0.170
071 20
4.5 FA113200X12 1.0 2.0 4.7 0.350
5.5 FA113202X12 2.1 4.0 9.5 0.700
6.5 FA114139X12 4.0 8.0 14.4 1.6
Piston
027 100 5.5 FA113202X12 16.0 16.0 19.0 3.0
6.5 FA114139X12 19.0 19.0 38.0 6.5
017 100 5.5 FA113202X12 38.0 38.0 50.0 7.0
6.5 FA114139X12 50.0 50.0 90.0 12.0
Bellows 236 35 5.5 FA113202X12 5.5 11.0 16.0 1.6
6.5 FA114139X12 8.3 16.0 28.0 2.5
315 72 5.0 FA113201X12 17.5 28.0 65.0 5.0

Type OS2
11
MAX. AND
MIN.
BMS SPRING MAX. and MIN. INTERVALS
∆1 and ∆2
Type Size PMS box
(bar)
ø Wire
(mm) Code
Wdsu setting (bar)
Min. low
point
possible
Max. high
point
∆1
(bar)
∆2
(bar)
Diaphragm
162 10
2.0 FA113195X12 0.010 0.035 0.004 0.010
2.5 FA113196X12 0.025 0.080 0.005 0.025
3.0 FA113197X12 0.045 0.140 0.010 0.050
3.5 FA113198X12 0.070 0.240 0.014 0.060
4.0 FA113199X12 0.115 0.380 0.018 0.150
5.0 FA113201X12 0.140 0.750 0.050 0.350
5.5 FA113202X12 0.230 1.3 0.080 0.600
6.5 FA114139X12 0.450 2.3 0.170 1.1
071 20
4.5 FA113200X12 1.0 5.1 0.350 2.5
5.5 FA113202X12 2.1 11.0 0.700 5.5
6.5 FA114139X12 4.0 16.0 1.6 10.0
Piston 027 Not possible with only 1 BMS
017
Bellows 236 35 5.5 FA113202X12 5.5 16.0 1.6 10.0
6.5 FA114139X12 8.3 28.0 2.5 20.0
315 72 5.0 FA113201X12 17.5 65.0 5.0 33.0
Table 16.Max. and Min. Spring Adjustment Ranges
Denitions
Table 17.Definitions
PSD box Maximum operating pressure for box
Pd Nominal downstream regulator pressure
Pd max Maximum downstream regulator pressure (normally closing regulator pressure)
Pd min Minimum downstream regulator pressure (disturbance in function with flow and/or inlet pressure is to be
considered)
Pdo Maximum releasing pressure
Max. high point High regulator pressure at maximum
Max. low point Low regulator pressure at maximum remaining within the accuracy class
Max. low point possible Low regulator pressure at furthest maximum point (precision is not guaranteed)
Pdu Minimum releasing pressure
Min. high point High minimum regulator pressure
Min. low point Low regulator pressure at minimum remaining within the accuracy class
Min. low point possible Low regulator pressure at furthest minimum point (precision is not guaranteed)
Wdso Overpressure specific range obtained from slam shut valve
Wdsu Underpressure specific range obtained from slam shut valve
∆1Minimum di󰀨erence allowed between Pdo and Pd max. and/or between Pdu and Pd min.
∆2Maximum di󰀨erence allowed between maximum and minimum releasing pressure

Type OS2
12
!
Selection Guide Lines: Pressure Limitations
Table 18.Pressure Limitations
Max. Only Min. Only Max. and Min.
Pdo ≤ PSD box (BMS) Pd max < PSD box (BMS) Pdo ≤ PSD Box (BMS)
Pdo ≤ Pt high point Pdu ≤ Pt high point Pdo ≤ Pt high point
Pdo ≥ Pt low point Pdu ≥ Pt low point Pdo ≥ Pd max + ∆1
Pdo ≥ Pd max + ∆1 Pdu ≥ Pd min - ∆1 Pdu ≥ Pt lowest point possible
Pdu ≤ Pd min - ∆1
Pdo - Pdu ≤ ∆2
Note
When the setpoint (max. or min.) falls
between the lowest and lowest point
possible, the precision may pass into a
superior range (example AG 2.5 —> AG 5). If
the point value is too close to that of the Pd,
the option RJGI tripping is recommended
(consult factory). In the case of two safety
manometric boxes (BMS) both boxes should
have a PSD > to the highest Pdo.
Selection of BMS and Springs
Choose the type of safety manometric box (BMS) according
to: PMS, the type of releasing precision.
Choice of springs:
• Max. or Min. only
Take the spring with the highest point directly superior to
the releasing pressure required.
• Max. and Min.
Take the spring with the highest maximum point superior to
the maximum releasing pressure required or with the lowest
point inferior to the minimum tripping pressure required.
Table 19. Choice of BMS and Springs
PSD Diaphragm Bellows Piston
0 to 20
20 to 72 (*)
72 to 100
AG 2.5
AG 5
Max. only
Min. only
Max. and Min.
(*) Choice between piston (regular) and bellows (optional). Bellows are
recommended if you require a small gap between releasing pressure,
inlet pressure and exact precision. Pistons do not facilitate minimum and
maximum releasing.
MATERIALS (BMS)
Table 20.BMS Material
Diaphragm Bellows Piston
Spring case Zinc-plated steel Stainless steel
Spring box Aluminum + Chromatation
Diaphragm Nitrile mesh
Piston Stainless steel
Bellows Stainless steel
Spring Zinc-plated steel
Adjustment
screw Zinc-plated steel
WARNING
CAUTION
ADJUSTMENT (BMS)
AUTHORIZED PERSONNEL ONLY
Risk of injury
After rearming, remove the reset key from
the stem. Do not put fingers in or near the
reset mechanism area.
Generally speaking, adjustments are carried out with the
slam shut valve closed. Only the detection stage is reset.
Control of the releasing value may be obtained by resetting
the two stages.
Before any adjustment, check that the
spring range installed corresponds to the
required setpoint.

Y
X
D2
D1
12 3 45
6 7
Type OS2
13
N22
Type BMS 1 (Figures 20 to 22)
Releasing by Max. Only
• Adjusting the Releasing Screw
- Free the min. hook (key 2), then in the following
conditions:
· no pressure in the safety manometric box (BMS)
· setpoint spring compressed so that the distance
between the releasing screw and the pin D1 no
longer increases
- Adjust the releasing screw (key 1) to
X = 1.5 mm (detection stage set)
- Jam nut (key 3)
• Adjusting the Max. Only Releasing Pressure
- Admit the releasing pressure to Pdo
- Screw the adjustment screw (key 5) until detection
stage can be set
- Unscrew the adjustment screw (key 5) until detection
stage release
- Check the pressure value at the releasing point
(adjust if necessary)
- Jam nut (key 4)
Releasing by Min. Only
• Adjusting the Releasing Screw and Hook
- Free the min. hook (key 2), then in the following
conditions:
· setpoint spring decompressed (adjustment screw
(key 5) unscrewed)
· pressure equal to the releasing pressure required
for Pd min in the BMS
- Adjust the releasing screw (key 1) to X = 2 mm
(detection stage set)
- Jam nut (key 3)
- Put the hook (key 2) into position and adjust
Y = 1.5 mm with nuts (key 6) and (key 7)
- Jam nuts (key 6) and (key 7).
• Adjusting the Min. Only Releasing Pressure
- Continue admitting the required releasing pressure.
Screw the adjustment screw (key 5) until detection
stage release.
- Check the pressure value at the releasing point
(adjust if necessary).
- Jam lock nut (key 4).
Releasing by Max. and Min. (Diaphragm or
Bellows Only)
• Adjusting the Releasing Screw
- Free the min. hook (key 2), then in the following
conditions:
· setpoint spring decompressed (adjustment screw
(key 5) unscrewed),
· pressure equal to the max. releasing pressure
required in the BMS,
- adjust the releasing screw (key 1) to X = 0 mm
(detection stage set).
- Release manually.
- Unscrew the releasing screw (key 1) 2 turns, which
represents a distance of approximately 1.5 mm.
- Jam nut (key 3).
• Max. Adjustment
- Same procedure as paragraph “Adjusting max. only
releasing pressure”
• Min. Adjustment
- Admit an average pressure between max. and min.,
(for example: regulator set-point pressure)
- Set the slam shut
- Admit a pressure equal to the min. Pd min. releasing
pressure required
- Adjust the hook (key 2) by progressively moving nuts
(key 6) and (key 7) until it releases
- Jam nuts (key 6) and (key 7)
- Check the pressure value at the releasing point (adjust
if necessary).
Figure 23.Releasing by Max. Only
X = distance between releasing screw and pin D1
Y = distance between releasing screw and pin D2

X
Y
D2
D1
1
2
3
45
6
Type OS2
14
N23
Type BMS 2 with 1 Max. Only Type BMS 1
Releasing by Max. Only
• Adjusting the Max. Push Button
- Remove the hook (key 2), then in the following
conditions:
· no pressure in the BMS
· setpoint spring compressed so that the distance
between the push button (key 1) and the pin D2 no
longer increases
- Adjust the push button (key 1) to X = 1.5 mm
(detection stage set)
- Jam nut (key 3).
• Adjusting the Max. Only Releasing Pressure
- Same procedure as paragraph “Adjusting the max.
only releasing pressure”.
Releasing by Min. Only
• Adjusting the Min. Only Releasing Pressure
- Remove the max. push button (key 1) or screw it tight
to neutralize it
- Jam nut (key 3), then in the following conditions:
· setpoint spring decompressed (adjustment screw
(key 5) unscrewed)
· pressure equal to releasing pressure required in the
BMS, adjust the min. hook (key 2) to Y = 1.5 mm
(detection stage set)
- Jam nut (key 6).
• Adjusting the Min. Only Releasing Pressure
- Same procedure as paragraph “Adjusting max. only
releasing pressure”.
Releasing by Max. and Min.
• Adjusting the Push Button
- The min. hook (key 2) is completely unscrewed, then
in the following conditions:
· setpoint spring decompressed (adjustment screw
(key 5) unscrewed),
· pressure equal to the max. releasing pressure
required in the BMS
- Adjust the push button (key 1) to X = 0 mm
(detection stage set)
- Release manually
- Unscrew the push button (key 1) 2 turns, which
represents a distance of approximately 1.5 mm
- Jam nut (key 3).
• Adjusting the Releasing Pressure to Max. and Min
-Max. Adjustment
· Same procedure as paragraph “Adjusting the max.
only releasing pressure”.
-Min. Adjustment
· Admit an average pressure between max. and min.,
(for example regulator set-point pressure)
· Set the detection stage
· Admit a pressure equal to the min. releasing
pressure required
· Screw the hook (key 2) progressively until detection
stage release
· Jam nut (key 6)
· Check the pressure value at the releasing point
(adjust if necessary).
MAINTENANCE (BMS)
• Control
The safety valve and pressure accessories are subject
to normal wear and must be inspected periodically
and replaced if necessary.
- Slam shut releasing
- External tight shut
- Impulse part (diaphragm, bellows or piston)
The frequency of inspections, checks and
replacement depends on the severity of service
conditions and must comply with the national
or industrial codes, standards and regulations/
recommendations applicable.
• Disassembly
- Unscrew the connector form the sensing line
- Remove the safety manometric box (BMS)
- Unscrew the blocking nut on the adjustment
screw (manually)
Figure 24.BMS 2 - Releasing by Max. Only
MAX. ONLY TYPE BMS1
ADJUSTMENT

Type OS2
15
- Unscrew the adjustment screw (resetting tool)
- Remove the hook or plate, depending on the type of
Type BMS 1 or 2, from the detection rod
(at spanner 7)
- Remove the upper case
· BMS 162 (at spanner 11)
· BMS 071 (flat spanner 8)
· BMS piston 27/17 (key 5)
· BMS bellows 236/315 (key 5)
- Disassemble the set plate/counter plate (at
spanner 17 and pliers) or
- Remove the bellows or piston and guide (manually)
• Assembly
- Proceed in reverse order to disassembly
• BMS torque values
- Upper spring case/manometric box
· BMS 162: 8 N•m
· BMS 071: 5 N•m
· BMS piston 27/17: 6 N•m
· BMS bellows 236/315: 6 N•m
- BMS 162 and 071 nut/diaphragm plate:20 N•m

Type OS2
Americas
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