Ashcroft t5500e Manual de instrucciones de instalación y mantenimiento - Página 9
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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.
7.4.2 Zero point adjustment for transmitter
While Zero adjustment is not normally necessary, it may be desirable to trim out any offset in the system. However,
proper Span calibration requires a pressure standard three to five times more accurate than the accuracy of the
transducer, and there may also be interaction of Span on Zero. For detailed instruction see chapter 8.2.1. Zero and
span adjustment for transmitter
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 life, we recommend that it is
checked periodically.
8.1 Safety
When undertaking service 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
Inspection of function and recalibration should be at regular intervals. 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 display.
Check function, in conjunction with downstream components.
Check pressurized connection pipes for seal condition.
8.2.1 Zero and span adjustment for transmitter
While Zero adjustment is not normally necessary, it may be desirable to trim out any offset in
the system. However, proper Span calibration requires a pressure standard three to five times
more accurate than the accuracy of the transducer, and there may also be interaction of Span
on Zero.
Access to "Z" and "S" pots via the electrical termination or screw cap at the back of the unit is
standard. Access is gained by removing the black threaded cap, once removed you will see the
pots indicated by "Z" and "S" respectively as shown below. Using a small trim pot tool, you can
adjust zero ±10% of full scale and span ±10% of full scale.
Recalibration Instructions:
1. Apply 0% full scale pressure.
2. Adjust the output using the zero adjust trim pot.
3. Apply 100% full scale pressure.
4. Adjust the output using the span adjustment trim pot.
5. Repeat steps 1 through 4 as necessary.
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