Aalborg GFM - Manual (Page 8)

4
IMPORTANT NOTES:
In general, “D” Connector numbering patterns are standardized. There are, how-
ever, some connectors with nonconforming patterns and the numbering
sequence on your mating connector may or may not coincide with the numbering
sequence shown in our pin configuration table above. It is imperative that you
match the appropriate wires in accordance with the correct sequence regardless
of the particular numbers displayed on your mating connector.
Make sure power is OFF when connecting or disconnecting any cables in the system.
When connecting power to the GFM mass flow meter via the DC power jack, do
not connect any power supply to the 9-pin 'D' Connector. The DC power jack has
a center positive polarity.
When battery use is required to power the GFM, use only the optional battery and
accompanying charger available from Aalborg
7.
ƽ
Based on the device serial number the power input is protected by a 750mA (12
and 24 Vdc flow meter models with serial numbers below 340621-1) or 300 mA
(universal power flow meter models with serial numbers above 340621-1) M
(medium time-lag) resettable fuse. If a shorting condition or polarity reversal
occurs, the fuse will cut power to the flow transducer circuit. Disconnect the power
to the unit, remove the faulty condition, and reconnect the power. The fuse will
reset once the faulty condition has been removed.
CAUTION: Resettable fuse will not protect meter if power supply voltage
exceeds maximum voltage specified for particular model.
ƽ
In order to operate flow meter within the specification the cable length for analog
0-5 Vdc output and remote LCD display may not exceed 9.5 feet (3 meters).
Use of the GFM flow transducer in a manner other than that specified in this manu-
al or in writing from Aalborg
7, may impair the protection provided by the equipment.
2.3.1 Remote LCD Readouts
GFM Mass Flow Meters are available with optional remote reading LCD displays
supplied with a three foot long wire to accommodate most applications. This con-
figuration includes the upper block element which serves as the LCD readout
mounting. Special lengths of remote extension wiring (up to 9.5 feet [3 meters])
are available on request.
2.3.2 Panel Mounting Readouts
Another option for the GFM Mass Flow Meter is the Panel Mounting Remote
Readout. In this configuration the LCD readout is supplied with a three foot long
extension wire, and no aluminum housing around the LCD. The LCD readout for
panel mounting includes a bezel with two plastic screws which conveniently fit into
a rectangular cut-out for panel mounting (see Figure 2.b).