FilterSense DynaCHARGE PM 1 PRO-A, Инструкция по установке и эксплуатации

Страница: 30 / 36

PM 1 Installation and Operating Manual v1.2
30
FilterSense © 2016
7 Alarm Setpoint Guidance
Alarms should be set based on observing the output over the full range of normal operating conditions. For
fabric filter applications, monitor the readings when the filter media is in good non-leaking condition and with
cleaning both disabled and enabled. For filter applications, baseline and peak particulate readings following
cleaning cycles should be noted.
Once a good set of readings is observed, alarms should be set based on the alarming objective. In all cases recall
the output of a
particulate monitor is reasonably linear/proportional to mass. This means that if
the readings increase by a factor of 3, for example, the amount of particulate will have increased by a factor of 3.
If during normal operation the baseline is always 0pA, contact the factory for a model with lower detection
capabilities.
The following are the main approaches to setting the alarms.
Leak Alarming (focus is on detecting leaks in filter media)

Adjust Smoothing Seconds for good response to cleaning cycles while keeping the baseline fairly
stable.

Set a HI (peak) alarm to capture increasing cleaning cycle peak readings at 1.5x to 5x typical peak height
with a 1- to 5-second delay. This provides an early warning alarm.

Set a HIHI (baseline) alarm to capture increasing baseline readings at 2x to 10x average baseline
reading with a 30- to 180-second delay.
Proportional Alarming (focus is on detecting a relative change in the mass concentration)

Adjust Smoothing Seconds for relatively stable particulate readings.

Set a HI (peak) alarm at a desired multiple over the average baseline reading with a 1- to 60-second
delay.

Set a HIHI (baseline) alarm at a desired multiple over the average baseline reading with a 30- to
360-second delay.
Powder Flow Alarming

Adjust Smoothing Seconds for relatively stable particulate flow readings.

Set a HI (increased powder flow) alarm above the desired powder flow rate.

Set a LO (loss of powder flow) alarm below the desired powder flow rate.