Ashcroft T5500, Инструкция по эксплуатации и техническому обслуживанию

Страница: 10 / 21

Page 10 of 21

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).
8.4.2 Setting the switch point
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.
8.4.3 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
8.5 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.
9 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.
9.1 Safety