Ashcroft T5500-kf Instruksi Instalasi dan Pemeliharaan - Halaman 4
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Installation and Maintenance Instruction for
T5500/T6500 Pressure Gauges
with switching contacts
•
A bracket must be installed to support the pressure
gauge if the mounting process pipe is not able to
provide adequate support.
•
Devices with a blow-out require a minimum spacing to
the rear of 20 mm.
•
The installation location should be chosen such that the
work-spaces for operating personnel are not located to
the rear of the pressure gauge.
7.3
Mounting/Installation
7.3.1
Process conection
The instrument is intended and factory adjusted for vertical
mounting, pressure ports downward. When mounted
in other orientation (max. ± 10°) the pointers' zero position
needs to be adjusted (see 7.4.1 Zero point adjustment).
•
Connection to be made by authorized and qualified
personnel only.
•
Use only with the mechanical process connection
provided – regarding the configuration, see order code
on the device type label, with a matching threaded seal.
•
When connecting the device, the process piping must
be depressurized.
•
The process pipe must be installed on an incline so
that:
- for fluid measurement, no air pockets are created
- for gas measurement, no water pockets are
created
If the necessary incline is not achieved, then at
suitable points water separators or air separators
must be installed.
•
The pressure process pipe must be kept as short as
possible and installed without sharp bends, to avoid a
delayed response time.
•
With liquid measurement media, the pressurized
connection pipe must be degassed, since any gas
bubble inclusions result in measurement error.
If water is used as the measurement medium, the device
must be frost-protected.
Safety notice: Only mount using the correct open-
jawed wrench, and do not twist the device itself.
7.3.2
Electrical connection
•
Connection to be undertaken by authorized and
qualified specialist staff only.
•
The electrical connection of the device is to be
undertaken in accordance with the relevant regulations
of the VDE and the regulations supplied by the local
utilities company.
•
Disconnect the plant from the mains supply before
wiring electrical connections.
•
Install appropriate fuses upstream.
Please refer to type
label for configuration
of connection
Ashcroft Instruments GmbH
Deutschland / Germany
Max-Planck-Str. 1
D-52499 Baesweiler
Tel.: +49 (0) 2401 808-0
©2018 Ashcroft Instruments GmbH IM-T5500KF-EN Rev. A 11/18
P/N 095I111-01EN
All specifications are subject to change without notice. All sales subject to standard terms and conditions.
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7.4
Starting up
The precondition for start-up is proper installation of all
electrical feed lines and metering pipes. All connecting lines
must be installed so that no mechanical forces can act on
the device.
Before start-up, the seal on the pressurized connection line
must be checked.
7.4.1
Zero point adjustment
The pressure gauges are supplied calibrated ex works, so
that as a rule there is no need for calibration works at the
installation point.
For devices with Micrometer pointer (see. order code), zero
point adjustment on site is possible. For this, proceed as
follows:
•
Depressurize the pressure metering pipe.
•
Open the bayonet ring and remove ring and window.
•
Hold the pointer in place while turning the screw,
until the pointer (after releasing again) has the correct
position.
•
Close the case again and pay attention to correct fit of
window, gasket and bayonet ring.
Liquid filled gauges must be demounted before
i
the zero point adjustment can be done (on a
horizontal area to prevent leaking).
7.4.2
Setting the electric contacts
An adjustable lock is fitted in the front panel of the pressure
gauge. Using the removable adjustment key, the contacts
mounted on the target value
indicators can be set to any
point on the range covered by
the scale.
For reasons relating to
accuracy of switching and
the lifetime of mechanical
measurement systems, the
switch points should be
positioned between 10% and
90% of the range.
•
Place the adjustment key on the axle of the adjustable
lock.
•
Press the axle inwards, until the carrier arm grips
behind the adjuster pin on the target value indicator.
•
By turning the key, adjust the target value indicator to
the desired switch point.
Release the pressure on the axle, and remove the
adjustment key.
7.4.3
Contact function
Function 1: Close contacts with the indication rising in a
clockwise direction.
Function 2: Open contacts with the indication rising in a
clockwise direction.
Contact assignment:
1st contact left target value indicator,
2nd contact middle target value indicator,
3rd contact right target value indicator
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