Dwyer Instruments PMT2 Serie Installation Und Betriebsanleitung Seite 4

Make sure the PMT2 is securely mounted to the stack, pipe or duct to prevent vibration
during operation. Make sure the transmitter is grounded properly.
Check the power supply wiring to make sure the polarity is correct before powering
the PMT2. Turn the power on to the transmitter and turn the Range and Test selector
switch to 4 mA (position 2). The PMT should output 4 mA, check the output with a
20 mA (position 1) and repeat the process. If the output is 0 mA, make sure the power
supply is on and check for loose wires.
peaks during a cleaning cycle. The four linear ranges output 4 mA at 5 pA and 20 mA
the ranges and less at the high end.
1 Test
2 Test
3 5 to 100 pA
4 5 to 500 pA
5 5 to 1000 pA
6 5 to 5000 pA
7 Log 5 to 500 pA
8 Log 5 to 5000 pA
Position 9 and 0 are unused.
20 mA
4 mA
890 pA - 16 mA
1000 PA
750 PA
EMISSION
SPIKE ALARM
500 PA
BASELINE
ALARM
5 PA
The logarithmic ranges offer a prolonged low-end of the scale while the high-end of the
range is compressed. This offers better resolution for the baseline monitoring and still
allows the operator to see the particulate spikes during cleaning cycles. Logarithmic
particulate spikes during cleaning cycles.
)
( (M-4)
16
)
( (12-4)
16
)
( (14-4)
16
The PMT2 will provide a 4-20 mA signal based on the range selected at set up. Alarms
can be programmed in the PLC or control system based on the 4-20 mA signal from
the particulate transmitter.
spikes and the second alarm to detect an increase in the baseline.
The alarm monitoring the emission spikes should be set to identify changes in the
duration will increase. The emission spike frequency will also increase because the
be changed right away.
The baseline alarm should detect an increase in the baseline reading. The type of
dust collector and facility regulations will dictate where the baseline alarm has to be
set. Typically the baseline alarm should be set 4 to 5 times over the initial baseline
base line alarm should be set between 40 pA and 50 pA. It is recommended to set a
time delay in the PLC or control panel alarm to prevent false alarms during cleaning
cycles. When the output signal from the PMT2 is continuously above baseline alarm
will need to be changed soon.
INCREASED SPIKE
BECAUSE OF
FILTER WEAR
SPIKES CAUSED
BY CLEANING
INCREASED SPIKE AND
BASELINE BECAUSE
OF FILTER WEAR
REPLACED
FILTERS
TIME