User Manual

Particulate Monitoring Systems Installation & Operating Manual

Once the control unit and coaxial cable zero have been checked, proceed to the Sensor Zero Check.

To perform the sensor zero check the process flow must be stopped or a sensor test pipe (available

from Factory) or length of metal pipe will be needed (4”-6” diameter pipe or larger). The pipe should

be at least 3 in (8 cm) longer than the probe itself and must be grounded. The length of pipe will serve

as an electrical shield for the probe while it is out of the process.

SENSOR ZERO CHECK

1. Do not remove the sensor from a running process if it will in any way

compromise personnel, plant safety or hazardous area safety procedures.

2. Disconnect power to the control unit.

3. Remove the sensor from the process and insert it into the grounded metal

test pipe. For hazardous area sensors do not disconnect the external sensor

earth ground strap.

4. Re-apply power to the control unit and allow the reading to stabilize for 1-2

minutes.

5. Read the display. It should be below the control units specified minimum

detection level. If the sensor passes this check there are no false signals

from the sensor.

PASS:

1. Disconnect power to the control unit.

2. Remove the sensor from the grounded test pipe and re-insert into the

process. For hazardous area sensors do not disconnect the external sensor

ground strap.

FAIL:

1. Contact the factory for further assistance.

When performing a zero check, keep in mind that it may be acceptable to consider a small false signal

negligible. For example if the baseline readings are 100pA and a system zero offset of 1pA was

found, this is only a 1% affect on the normal readings. If using the device for basic flow/no flow

detection or basic emissions detection, this would not be significant.