Tabla de contenido
Idiomas disponibles
Idiomas disponibles
AVERAGING SELECTION
The PMT2 offers a digital averaging function because of the irregular flow of particulates
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
fluctuations that could trip alarm settings. It is important to select an averaging setting
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.
ZERO CALIBRATION
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,
make sure the dust collector is shut down and there is no air flow in the duct, stack or
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
on application. There are two ways the PMT2 can be zeroed. The first method is
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
approximately 3 minutes. When zeroing is complete the output will return to a normal
output signal and the transmitter is ready for operation.
Remote zero
10-28 V
-
Note: Do not zero the PMT2 while the dust collector is in operation.
Figure 4: Remote zero and zero switch
Symptom
Potential Source
High Output
Loop Wiring
Power Supply
Erratic Output
Loop Wiring
Low or No Output
Zeroing
Loop Wiring
Table 3: Troubleshooting
+
Corrective Action
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
while zeroing. Wait approximately 3
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.
MAINTENANCE/REPAIR
Upon final installation of the Series PMT2, no routine maintenance is required. The
Series PMT2 is not field serviceable and should be returned if repair is needed. Field
repair should not be attempted and may void warranty.
WARRANTY/RETURN
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.
Zero switch
Tabla de contenido
