VorTek U44 Series, Instruction Manual

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Series U44 Instruction Manual
M-000-00090
33
4.8 Totalizer Pulse Output
Each time the flow meter reaches a unit flow, it may generate a totalizer pulse output to a remote counter.
The totalizer pulse output can be transmitted through Open Collector Transistor (OCT) or a relay. Therefore, it is
necessary to configure OCT and the relay accordingly. (Refer to Totalizer #1 Menu). For example, if it is necessary
to transmit the positive totalizer pulse through a relay, and each pulse represents a flow of 10 m
3
, the configuration
is as follows:
In Units Menu – Volume Total Unit, select the totalizer flow unit "m
3 ";
In Totalizer #1 Menu – Pulse, select the scale factor "e. x10";
4.9 Active 4 - 20 mA Analog Output Calibration
Attention
Each flow meter has been calibrated strictly before leaving the factory. It is unnecessary to
carry out this step except when the current value (detected while calibrating the current
loop) displayed in Engineer Menu – CL Adjust is not identical with the actual output
current value.
The hardware detect window must be activated prior to calibrating the Analog Output. The procedure is as follows:
Engineer Menu – CL Adjust is for 4 - 20 mA calibration. If you need to enter the password, enter it. With no effect
to next power on, this menu will close automatically as soon as the power is turned off.
Use the number keys to switch calibrate the current loop 4 mA output. Use an ammeter to measure the output of the
current loop and adjust the displayed numbers at the same time. Watch the ammeter until it reads 4.00. Stop at this
point, the 4 mA output has been calibrated.
Use the number keys to switch calibrate the current loop 20 mA output. The method is the same as the 4 mA
calibration.
Attention
Make sure to select an appropriate totalizer pulse. If the totalizer pulse is too big, the
output cycle will be too long. If the totalizer is too small, the relay will operate too
quickly, you may shorten the life of the relay, as well as skip some pulses. The totalizer is
recommended to transmit within the range of 1 ~ 3 pulse per second.