Can the TensionRite® Belt Frequency Meter be used with
rechargeable batteries?
The TensionRite® Belt Frequency Meter can be successfully
energized with an array of any AA size batteries, either
rechargeable or disposable. The meter does not feature recharging
circuitry so the user must supply a separate battery charging
station in order to use rechargeable batteries. A second set of
batteries is also recommended to avoid leaving the meter without
power while the batteries charge. Leaving the meter unenergized
for longer than approximately 30 seconds will result in the loss of
any stored data.
May the TensionRite® Belt Frequency Meter continue to
be used while on-board charging of the batteries is taking
place or even when connected to the charger with
batteries removed?
In theory, maybe: in practice, no. A software block has been placed
to prevent operation of the optical sensor while the batteries are
under on-board charging.
Most commercial charging units utilize only a rectiier for nominal
smoothing of the output. The optical sensor requires a ripple-
free current supply. To preclude potential damage to the infrared
circuitry and to eliminate the harvest of faulty data, the meter
has been “taught” to display a charging indication (similar to the
“low battery” signal) when turned on during a charging cycle. In
addition, we strongly recommend that the sensor head be totally
disconnected during the on-board battery charging process. Refer
to Section 4.5 of this User Manual for further information.
Will tramp IR signals from other systems aect the operation
of the TensionRite® Belt Frequency Meter?
The answer is a deinite no. The amount of environmental IR
reaching the sensor (which has a narrow beam of only 15 degrees)
is very small when compared with the IR signal from the sensor
emitter that is relected from the belt. In addition, the meter
uses a technique called “synchronous demodulation” to recover
the relected belt signal while rejecting all external signals not
modulated in synchrony with the meter.
Will tramp signals from the TensionRite® Belt Frequency Meter
aect other equipment using IR communication?
It is not possible to give a deinitive universal statement on this
topic. It depends primarily upon the quality of the third party
equipment. Again, the narrow beam in addition to the very low
energy of that focused beam make it highly unlikely that the signal
from the TensionRite® Belt Frequency Meter will interact with
any other device. If this is a concern in your location, a carefully
controlled trial is suggested prior to releasing the device for
general use in your facility.
Is the TensionRite® Belt Frequency Meter rated as intrinsically
safe as deined by International Standard IEC 6007911?
The TensionRite® Meter does not qualify for I.S. certiication. As
such, the meter is not to be used in locations with potentially
explosive atmospheres. The meter circuitry generally complies
with the technical requirements of the standards. However, the
meter housing will not pass scrutiny. The ease in which the
batteries could, in some circumstances, fall free and thus have
no current/power limit protection prevents the housing from
qualifying for I.S. certiication.
19
Appendix
3.0 Frequently Asked Questions
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