Ashcroft T7 series Installatie- en onderhoudshandleiding - Pagina 9
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Pagina afdrukken7.1 Safety
The switch should be protected against the effects of knocks and impacts. The device should only be transported in
the packaging provided. The device should only be transported in a clean condition (free of residues of measuring
media).
7.2 Transport inspection
The delivery must be checked for completeness and damage during transport. In the event of damage during
transport, the delivery must not be accepted, or only accepted subject to reservation of the scope of the damage being
recorded and, if necessary, a complaint initiated.
7.3 Storage
The switch must be stored in dry, clean conditions, within a temperature range of -40 to +60 °C, protected against
direct exposure to sunlight and protected against impact damage.
8 Assembly/Installation
8.1 Safety
To ensure safe working during installation and servicing, suitable shut-off valves must be installed in the plant (see 6.4
Accessories), enabling the device:
To be depressurized or taken out of operation;
To be disconnected from the mains supply for repair or checks within the relevant plant;
Or to enable function tests of the device to be performed "on site".
During the works to mount/install the switch, the plant must be protected against being switched back on.
8.2 Preparations (requirements for the installation location)
A check on suitability of the device for the medium to be measured, the scope of the measurement range and of
the protection against special conditions such as vibrations, pulsations and pressure spikes.
A bracket must be installed to support the switch if the metering pipe is not able to provide adequate support.
Ambient Temperature: –20 to 60°C
Process Temperature: –20 to 60°C, other temperature limits are possible with different diaphragm materials
Refer to appropriate datasheet for materials of construction and technical information.
These controls are precision instruments and should never be left with internal components exposed. During
installation insure that covers are in place and conduit openings are closed except when actually working on the
control.
To minimize the risk of injury, the control must be installed according to the required safety and electrical codes.
To attain the degree of protection listed on the switch it may be necessary to add required conduit fittings.
The switch must be protected from moisture, shock and/or extreme vibration.
Mounting position: Switch can be mounted in any position. It is recommended that unit be set in intended
operating position.
Cautions:
Always install the cover after wiring the switch and before power is supplied.
Before removing the cover in hazardous areas be sure there is no explosive atmosphere present and the power
supply is turned off.
For ATEX approved switches all safety locking devices and electrical earthing must be installed or connected
before operating.
Never carry a temperature switch by holding only the stem, bulb or capillary.
Do not push any foreign objects (ex. Screwdrivers) against the diaphragm.
Do not exceed ranges, current and/or voltage limits.
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