Dwyer Instruments PMT2 Serie Installation Und Betriebsanleitung Seite 5

and the spikes during cleaning cycles. There are ten options for averaging ranging
from 1 to 360 seconds. The digital averaging takes a running average of the readings
for the selected amount of time. This will dampen output spikes from particulate
that will allow the operator to see the cleaning cycles. It is recommended to monitor the
baseline trend and peak to peak trend between cleaning cycles.
Even though the PMT2 will come zeroed from the factory it is recommended to zero
the transmitter after installation to ensure the best accuracy. When zeroing the PMT2,
pipe the transmitter is monitoring. It is recommended to re-zero the PMT2 once every
12 months for optimal performance. Please check your local laws and regulations as
clean air standards may require zero calibration on a certain time schedule based
with the zero button on the front of the transmitter. Press and hold the button for 3
seconds and the transmitter will begin zeroing. The second method is the remote zero.
Supply DC voltage as shown in Figure 4 across the zero terminals on the back of
the transmitter for at least 3 seconds for the transmitter to start zeroing. While the
transmitter is zeroing, the PMT2 will output about 3.5 mA. The zero function will take
output signal and the transmitter is ready for operation.
Do not zero the PMT2 while the dust collector is in operation.
Loop Wiring
Power Supply
Loop Wiring
Zeroing
Loop Wiring
+
Check for dirty or defective terminals,
interconnecting pins or receptacles.
Check the output voltage of the power
supply at the transmitter terminals. It
should be 9.5-28 VDC.
Check the output voltage of the power
supply at the transmitter terminals. It
should be 9.5-28 VDC.
Check for intermittent shorts, open
circuits and multiple grounds.
Check the polarity at the signal
terminals.
The PMT2 will output about 3.5 mA
minutes and the 4-20 mA signal should
return to normal.
Check for intermittent shorts, open
circuits and multiple grounds.
Check the polarity at the signal
terminals.
Check the loop impedance.
repair should not be attempted and may void warranty.
Refer to "Terms and Conditions of Sales" in our catalog and on our website. Contact
customer service to receive a Return Goods Authorization number before shipping the
product back for repair. Be sure to include a brief description of the problem plus any
additional application notes.