NOVUS RHT-Air - Manual (Page 8)

RHT-Air
NOVUS AUTOMATION 8/8
9 SPECIAL CARE
The equipment needs special care since it is electronic:
• When opening it for fixation, you should keep away from the electronic
circuit due to the risk of damages caused by static electricity.
• The wiring should be carefully observed.
• When closing the box, the cover must be replaced properly, thus
ensuring that it is sealed.
9.1 CARE WITH SENSORS
The calibration of the humidity sensor can be altered if it is exposed to
contaminating vapors or extreme humidity or temperature conditions for
longer periods. In order to speed up the calibration, do as follows:
• Remove the sensor from the capsule.
• If solid particles are deposed on the sensor, wash it with water.
• Place the sensor in an oven at 80 °C (+ -10 °C) for 24 hours.
• Place the sensor for 48 hours in a place at around 20 and 30 °C and
humidity higher than 75% RH.
• Replace the sensor into the capsule.
9.2 BATTERY CARE
The Lithium battery, due to its chemical behavior, may present some
passivation symptoms when not used for long periods of time. This can be
observed by checking the battery voltage after 2 hours of equipment
operation. If the battery voltage measures less than 3.5 V, then the battery
may be passivated (not necessarily worn out). If this is the case, please try
applying the following procedures to recover the battery.
• Operate the equipment at its maximum power (14 dBm) and minimum
sample period (15 s).
• Let the instrument operate continuously in the above conditions for 24 h
while monitoring the battery voltage through reading register number 29
or the Diagnostic menu of the DigiConfig software.
• If the battery voltage exceeds 3.5 V, the battery can be considered
rehabilitated (depassivated). The equipment is then ready to use.
• In case the above doesn’t work, please remove the battery from the
equipment and discharge it for 5 minutes connecting a 220 ohm resistor
across the terminals.
• Then, reinstall the battery in the equipment and let it operate for 2 hours.
If the battery voltage remains above 3.5 V, then the depassivation
procedure was successful.
• If after going through the above procedures the battery still fails to work
properly, please contact Novus technical assistance for arranging battery
replacement.
IMPORTANT
The sensor used in this equipment may be damaged or de-calibrated if
exposed to contaminated atmospheres with chemical agents. Hydrochloric
acid, nitric acid, sulfuric acid and ammonia in high concentrations may
damage the sensor. Acetone, ethanol and propylene glycol may cause
reversible measurement errors.
10 WARRANTY
Warranty conditions are available on our web site www.novusautomation.com.