Detcon PI-500 - Manual (Page 30)

Reading Lower than Anticipated
Probable Causes: Zero Calibration done before unit f inished stabilizing, Incorrect Span Calibration.
1. Redo Zero and Span calibrations with validated Zero Gas and Span Gas standards.
2. Disengage Zero Offset feature if it is not necessary.
3. Contact Detcon to determine if target gas will not diffuse past the 316 Stainless Steel f lame arrestor.
Zero Calibration Fault
Probable Causes: Target gas or Interfering gases in background during Zero Calibration, Failed PID sensor.
1. Verify no target or interfering gases are present.
2. Redo Zero calibration with validated Zero Gas standard.
3. If recovering after a start-up, give more time to stabilize.
Span Calibration Fault
Probable Causes: Failed PID sensor (failed UV lamp bulb, optical window needs cleaning), ice/mud/dust blocking pro-
tective membrane, invalid span calibration gas due to age, type, and contamination or insuff icient f low rate.
1. Verify there is no ice/mud/dust blocking the sensor’s Flame Arrestor.
2. Redo Span Calibration with validated Isobutylene Span Gas standard.
3. Reinitialize unit by plugging in transmitter while holding the magnet on PGM1. Scroll through and select the cor-
rect gas type. Make sure all customer settings are re-entered after “reinitialization”.
4. Clean UV Lamp or replace UV Lamp.
5. Replace with new PID sensor.
Noisy Sensor (continuous drift) or suddenly Spiking
Probable Cause: Unstable power source, Inadequate grounding, Inadequate RFI protection.
1. Verify power Source output and stability.
2. Contact Detcon for assistance in optimizing shielding and grounding.
3. Add RFI Protection accessory available from Detcon.
LCD Difficult to Read
Probable Cause: Needs adjustment.
1. Adjust contrast pot as necessary.
Reporting “ERROR @ XXXXXXX”
Probable Cause: Span calibration calculation error.
1. Reinitialize unit by plugging in transmitter and the swiping the magnet over PGM1 while “Universal Transmitter” is
displayed. Scroll through and select the correct gas type and range (see section 3.12 Universal Transmitter Features).
Make sure all customer specif ic settings are re-entered after “reinitialization”.
3.14 S
PARE
P
ARTS
L
IST
943-000006-132 Calibration Adapter
500-005065-007 Connector board
327-000000-000 Programming Magnet
897-850800-000 3 port enclosure less cover
897-850700-000 Enclosure glass lens cover
960-202200-000 Condensation prevention packet (replace annually).
925-P15480-range PI-500 Series Universal Plug-in Control Circuit
370-P10000-000 Plug-in Replaceable PID sensor for 0-20 ppm and lower ranges (PI-500 Model)
370-P20000-000 Plug-in Replaceable PID sensor for =>50 ppm ranges (PI-501 Model)
975-600020-000 PID 10.6eV Replacement Lamp
975-600100-000 PID Detector Replacement Cell
975-520040-000 PID Lamp Cleaning Kit
390-404142-range* PID sensor head assembly
* Does not include plug-in replacement sensor cell.
Specify 3 Digit Range for PID sensor head as per examples below: If greater than 999ppm, use a “K” (for 1000). If
greater than 9,900ppm use a “P” (for %).
PI-500 Toxic Gas Sensors PG.30