Ashcroft N5500 Installation And Maintenance Instruction Manual - Page 7
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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.
7.4 Starting up
The precondition for start-up is proper installation of all electrical feed lines and metering pipes. All connecting lines
must be laid such 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.
Zero point adjustment on site is standard. 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 the zero point
adjustment can be done (on a horizontal area to prevent leaking).
7.5 Subsequent relocation of the gauge (by the customer)
Recommendation: Do not remove the pressure gauge from one metering point and fit it in a different place,
as there is a risk of the measuring media being mixed, with unforeseeable chemical reactions.
8 Servicing
The device is maintenance-free. However, to ensure reliable operation and a long lifetime for the device, we
recommend that it is checked regularly.
8.1 Safety
When undertaking servicing work on the device, the pressure lines must be depressurized and the plant secured
against being switched on again.
8.2 Check on function, and recalibration
The check on function and recalibration is carried out at regular intervals, depending on the application. The precise
testing cycles should be adjusted in line with the operating conditions and ambient conditions. In the event of various
device components interacting, the operating instructions for all other devices should also be taken into account.
Check on display.
Check on function, in conjunction with downstream components.
Check of pressurized connection pipes for seal condition.
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