Dwyer Series PUB - Manual (Page 10)

1: General Description
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1.4.3 Power supply and battery charging
Operating power is provided by an internal battery that can be charged from the utility supply using the supplied
external charger. When you first receive the unit you must put the battery on charge for a minimum of 6.5hrs
before use. A fully charged battery will power the instrument for up to 20 hours depending on the output utilization
and backlight usage.
The backlight can be selected to be either permanently OFF, illuminated for 10 seconds, 30 seconds or 1 minute
every time a key is pressed, or permanently ON – as configured in the Setup Instrument menu. If the backlight
is active continuously it will reduce the available battery operating time to 8hrs. Similarly, if the 4 to 20 mA output
is used constantly at 20 mA, the battery life would reduce by 50%. It is therefore beneficial to turn off the backlight
and 4 to 20 mA output facilities when they are not required.
When the instrument is operating in the ‘Flow Reading’ mode, the percentage battery charge level is displayed
symbolically on the LCD screen. A warning message is triggered if the charge falls to approximately 30%, at
which point there is up to four hours of battery operation remaining, depending on usage. The battery can be
charged both while the instrument is in use or when switched off. The instrument’s internal data is stored in non-
volatile memory and will not be lost even if the battery discharges completely.
1.5 Transducers
Different transducer sets are provided with the PUB-A and PUB-B models and are not interchangeable.
Transducer set 'A'
Supplied as standard with PUB-A for use on pipes in the range 0.5 to 4.5 inches (13 to 115 mm) OD.
Transducer set 'B'
Supplied as standard with PUB-B for use on pipes in the range 2 to 40 inches (50 to 1000 mm) OD.
Key Point: The battery is not a user-changeable item. The instrument must be returned
to your distributor if the battery needs replacing.
Key Point: Only use the supplied charger, or special adaptor lead. Failure to comply
with this will invalidate your warranty.
Key Point: Always use the transducers that were supplied with the instrument.