Ametek Drexelbrook ThePoint Series, Инструкция по установке и эксплуатации, Страница: 17 / 70

Installation
11
2.7.3 Failsafe
Failsafe describes the level condition that causes the output
relay to de-energize, and also the state of the relay upon loss
of power.
•
High Level Failsafe ( hlfs ). The relay will de-energize when
level is high, indicating high level upon loss of power. (N.O.
contacts open and N.C. contacts closed)
•
Low Level Failsafe ( llfs ). The relay will de-energize when
level is low, indicating low level upon loss of power. (N.O.
contacts open and N.C. contacts closed)
•
Instrument is supplied with failsafe jumper set in high
level ( hlfs ) position.
•
Failsafe is field-selectable using the Failsafe Jumper located
on top of Electronic Unit. See Figure 2-6.
2.7.4 ReCal Button, Memory Reset
If power has been applied to ThePoint prior to installation (on a
test bench) or, if ThePoint is moved from one vessel to another,
RECAL is necessary. RECAL allows the system's software to
capture the air capacitance generated by the sensing element
in tank.
Merely press and hold the RECAL button (shown in Figure
2-6) for five (5) seconds. After five seconds, ThePoint's two
LED’s flash for sixty seconds before the recalibration occurs.
(Removing power from the system while the LED's are flashing
will reset the memory immediately upon next power up).
Do not push the Recal button without first ensuring
that the material being measured is below the sensing
element.
The system is now ready for installation.
2.8 Spark Protection
Applications involving insulating granulars and insulating
liquids may produce a static discharge that can damage the
electronics. The RF series instrument is supplied with integral
heavy-duty spark protection to prevent static discharges from
damaging the electronic circuits.