Datasheet Content
PCS
Position indicator switch
VI
Visual position indicator
for valves and actuators
delta-elektrogas.com EE170 – 0421
ELEKTROGAS – datasheet EE170 - 0421
PCS - VI
Position indicator for valves and actuators
Contents
Description ............................................................................................................. 2
Features................................................................................................................. 2
Functioning and application ................................................................................... 3
Technical specifications ......................................................................................... 5
Ordering information .............................................................................................. 6
Standards and approvals ....................................................................................... 6
Description
The PCS is a mechanically activated switch for monitoring the position of the valve plate.
This device can be fitted to Elektrogas aluminium valves series VMR, VML, VMM, VMH, EVRM-
NA, EVRM-6NA, EVRM-NC, EVRM-6NC to check the closed position of the plate.
It can be fitted to the N.O. vent valve VMRNA to check the open position of the plate.
It can be also fitted to solenoid actuators (SR - SL - ST) to check the open/closed position of the
butterfly valve (VF - VFH).
The VI is a mechanically activated indicator for monitoring externally the position of the valve
plate. This device can be fitted to Elektrogas aluminium valves series VMR, VML, VMM, VMH,
EVRM-NA, EVRM-6NA, EVRM-NC, EVRM-6NC: when red indicator is visible, valve is open,
when indicator is blind, valve is closed.
Features
PCS and VI are available with working pressure 500mbar, 2bar or 6bar.
These devices can be fitted to Elektrogas valves provided with G1/8 threaded hole on the
bottom. This connection is present as standard for valves DN65 or bigger. For models DN50 or
smaller, it must be required in the order. Vent valve VMRNA are always equipped with G1/8
hole on the top for open position indicator. Solenoid actuator SR, SL or ST have to be
manufactured with a special execution for assembling the indicator and it shall be required in
the order.
An adapting rod is necessary to fit the indicator to an Elektrogas valve or actuator. The indicator
is supplied with the rod already mounted, to make installation easier.
The switch can be rotated on 360° on rod axis.
PCS Electrical connection with ISO4400 plug.
They are suitable for air and non-aggressive gases (families 1-2-3 EN437). Special versions are
available for use with aggressive gases.
The compact, robust and functional design permits a simple and quick installation, and it is
essentially maintenance free.
All components are designed to withstand mechanical, thermal and chemical stresses present
in a typical installation.
PCS can be provided in Ex-proof execution, for use in Zones 2 and 22, according to
2014/34/UE Directive (ATEX).
PCS and VI are 100% tested for seal and functioning.
WARNING
This device shall be installed in accordance with the laws in force.
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ELEKTROGAS – datasheet EE170 - 0421
Functioning and application
The PCS is a mechanically activated switch for
monitoring the position of the valve plate.
In a normally closed valve (Fig.2 shows a PCS
installed in a VMR valve), when valve is not
energized, plate is in contact with valve seat.
Switch rod is pushed and the electric contact is
switched in configuration 1-3.
When valve opens, plate leaves seat and frees the
rod, so that contact switches in configuration 1-2,
under the action of a return spring.
The EN 161 standard specifies that switch has to
commute when plate is within 1 mm to its closed
position, so PCS is a device able to detect the
closed status, not the completely open one.
Fig. 1 shows how contacts commute in a VMR
valve.
Fig. 1
Fig. 2
Fig.3 shows PCS mounted on a solenoid actuator. In this case minimum and maximum
regulation are not available and mounting of open position switch is possible only with SR type
(fast opening-fast closing).
CLOSED
POSITION
SWITCH
OPEN
POSITION
SWITCH
Fig. 3
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ELEKTROGAS – datasheet EE170 - 0421
In normally open valve VMRNA, PCS is mounted over the
stem. When valve is not energized (open), disc is open and
the magnetic core pushes the switch rod, so electric contact
is switched in configuration 1-3. When valve is energized
(closed), magnetic core pushes disc on seat and frees the
PCS rod, so that contact switches in configuration 1-2.
Fig. 4
VI is similar to PCS, but switch is replaced with a red indicator. In a normally closed valve (Fig.5
shows a VI installed in a VMR valve), when valve is not energized, plate is in contact with seat
and VI rod is pushed, so red indicator is blind.
When valve opens, plate leaves seat and frees the rod, so that red indicator is visible.
R
e
t
WARNING e
Location
G and mode of installation must be in compliance with local rules in force.
a
s
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ELEKTROGAS – datasheet EE170 - 0421
Technical specifications
Tab. 1
Connection G1/8 (ISO 228-1)
Max operating pressure 500 mbar 2 bar 6 bar
Max testing pressure 0.75 bar 3 bar 9 bar
Environmental temperature -15°C / +60°C
Installation See valve instruction sheet for the correct position
Gas type Air and non aggressive gases (fam. 1-2-3 EN 437)
Special versions for aggressive gases
Materials in contact with media Aluminum, Brass, Stainless steel
NBR, PTFE, FPM
(Special versions for aggressive gases without brass
and NBR)
PCS - switching capacity Standard Silver contact
Resistive Load Inductive Load/ Lamp
250VAC 2A 250VAC 0.3A
125VAC 3A 125VAC 0.5A
30VDC 3A 30VDC 1A
Special Gold plated contact:
Resistive Load Inductive Load/ Lamp
125VAC 0.1A ---
30VDC 0.1A ---
PCS - electrical connection ISO 4400 plug with PG11 cable gland
PCS - enclosure IP54 (EN 60529)
optional IP65
Weight VI 0,070 Kg
PCS 0,200 Kg
PCS Ex-proof version 0,300 Kg
H depending on which valve/actuator is to be mounted.
Fig. 5
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ELEKTROGAS – datasheet EE170 - 0421
Ordering information
Tab. 2
- PCS 6 .X
Pmax
- 500 mbar *
2 2 bar
6 6 bar **
PCS position indicator switch
VI visual position indicator
Rod type
1 for VMR0/1 EVRMNA0/1 EVRMNC0/1
3 “ VMR2/3 EVRMNA2/3 EVRMNC2/3
4 “ VMR35/4 EVRMNA35/4 EVRMNC35/4
4F “ VMR4.F EVRMNA4.F EVRMNC4.F
6 “ VMR6 EVRMNA6 EVRMNC6
8 “ VMR7/8 EVRMNA7/8 EVRMNC7/8
9 “ VMR9 EVRMNA9 EVRMNC9
95 “ VMR93/95 EVRMNA93/95 EVRMNC93/95
98 “ EVRMNA98 EVRMNC98
98S “ EVRMNA98.S EVRMNC98.S
910 “ EVRMNA910 EVRMNC910
912 “ EVRMNA912 EVRMNC912
M3 “ VMM20/25
M6 “ VMM32/40/50
M8 “ VMM65/80
HP “ VMH (all models)
RA “ VMRNA (open position of N.O. valve)
S “ SR-L-T (closed position)
S4 “ SR4 (open position)
S8 “ SR8 (open position)
Special…
