Black Provengas Safety Cut-off Control

Black Automatic Gas Controls

Black Provengas Safety Cut-off Control

• CE Approved
• Comprises control panel and isolating unit
• Control panel may be remote from isolating unit
• Connects into gas supply of safety shut-off valve
• Proving cycle manually initiated from control panel
• Low power consumption
• Integral time switch may be used to shut down the
system at the end of day
• Features key switch for security
• Standard emergency cut-out switch
• Optional extra external cut-out switches etc.
• Audible alarm for system proving failure
• Easy installation and commissioning; no complex
volume or orifice plate calculations required
• For use with a solenoid or an electrohydraulic gas safety
shut-off valve

PROVENGAS is designed with safety in mind and has been
tested and certified by BG Technology to the latest standards
and has approval. The system provides an easy, automated
means of proving the integrity of any gas installation on a
regular and routine basis. An integral time switch is provided
so that timed automatic control of gas installations may be
achieved. For security, the system is key switch operated and
is provided with its own emergency cut-off switch. Additional
safety features such as remote emergency cut-off switches,
fire switches and thermal fuses can be included in any
scheme.
Typical applications include schools, laboratories, kitchens,
workshops or any other installation where manual gas taps
etc. may be left open, either deliberately or by power failure
or human error for example, causing a potentially explosive
atmosphere.
PROVENGAS is also suitable for many industrial applications
with manual gas ignition and shut down, such as process
kilns or bakery machinery. The system may additionally be
used to prove the integrity of any "non-manualinstallation
such as a boiler house etc. Commissioning the system is
relatively simple, requiring no complex pipework volume and
orifice sizing calculations.
The system comprises two units, namely the GAS
ISOLATING UNIT and the CONTROL PANEL which are
used in conjunction with a GAS SAFETY SHUTOFF VALVE
(new or existing) complying with BSEN161. The isolating
unit connects into the gas supply upstream and downstream
of the gas safety shut-off valve. The control panel may be
mounted in any convenient location. A mains electricity supply
is required together with electrical connections to the isolating
unit and gas safety shut-off valve.
The operation of PROVENGAS is controlled from the control
panel which comprises a seven day time switch, a key switch,
an emergency cut-off switch, a PROVE switch and an LED
driven legend which shows the status of the system at any
moment in time. The user initiates a proving cycle by ensuring
the time switch is on, the cut-off switch is on, the key switch
is in the "onposition and then depresses the PROVE pushbutton.
The unit then goes through a "purgeperiod to vent
the system and if not fully vented, the NOT PURGED LED
illuminates. If fully vented, the system is slowly charged with
gas for a further 30 seconds after which the control checks
the system gas pressure. If lower than expected e.g. because
a gas tap is open, the LEAKING LED illuminates indicating
the system integrity is not intact ensuring the gas safety shutoff
valve remains shut. If the system gas pressure is at or
above the expected value, the PROVED LED illuminates and
the gas safety shut-off valve is energised.
An internal alarm is fitted to indicate a system leak and
this may optionally be configured to sound on vent failure
or following an interruption to the electrical mains supply.
The system shuts down and closes the gas safety shutoff
valve when any of the following events occur:- manual
shut down with the key-switch, timed controlled shut down,
operation of the internal emergency cut-off switch, power
failure or operation of any external safety device fitted to
PROVENGAS. Black Teknigas is committed to investing
in Health and Safety and PROVENGAS is the state of the
art device for gas system proving thereby ensuring safe
environments for work, study and leisure.