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PORTABLE DEW POINT MONITOR
INTRODUCTION ..................................................................................... 2
SPECIFICATIONS: ................................................................................... 2
OPERATION ........................................................................................... 3
Dryer Output Sampling ....................................................................... 3
Hopper Output Sampling ..................................................................... 3
Recorder Output Connection ................................................................ 4
CALIBRATION & MAINTENANCE ............................................................. 4
Dry-Down Test ................................................................................ 4
Replacement Parts ............................................................................. 4
Alarm Set Point Adjustment ................................................................. 5
F to C Display Change ..................................................................... 6
Sensor Replacement Procedure ............................................................. 6
Electronic Test Procedure ................................................................... 6
ADDENDUM
Wiring Diagram Drawing No. 6392NWD
Assembly Drawing No. 8072ASSY
PHONE: (800) 362-0706
MANUAL/8072PPE_E
MODEL 8072, 8072-230VAC
(units made after 2002)
Table of Contents
PLASTIC PROCESS EQUIPMENT, INC.
8303 CORPORATE PARK DRIVE
MACEDONIA, OHIO 44056
FAX: (800) 223-8305
February 2011
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Table of Contents
Summary of Contents for PPE 8072
- Page 1 PORTABLE DEW POINT MONITOR MODEL 8072, 8072-230VAC (units made after 2002) Table of Contents INTRODUCTION ..................2 SPECIFICATIONS: ................... 2 OPERATION ................... 3 Dryer Output Sampling ............... 3 Hopper Output Sampling ..............3 Recorder Output Connection ..............4 CALIBRATION & MAINTENANCE ............. 4 Dry-Down Test ................
- Page 2 INTRODUCTION The 8072 Dew Point Monitor is ideal for checking the operation of a dryer or confirming the dryness of plastic resin in a hopper. The monitor draws process air from the dryer or hopper into an internal manifold containing a sensor which provides dew point measurement.
- Page 3 OPERATION The 8072 is designed to sample process air at a pressure between -1 psig and +7psig. This range of air pressure is typical of that found in a plastics drying system. If you are sampling compressed air, consult factory for other model options. The plastic tubing supplied with this monitor can withstand temperatures up to 275ºF.
- Page 4 Recorder Output Connection The 4-20mA output jack on the front panel allows continuous monitoring of dew point over a period of time. The supplied mating connector can be wired as needed. Pin 1: 4-20mA signal Pin 2: ground CALIBRATION & MAINTENANCE Dry-Down Test Verify the Dew Point Monitor's ability to read dry air by performing the following steps: Note: the supplied desiccant cartridge should be blue in color.
- Page 5 Alarm Set Point Adjustment The dew point at which an alarm occurs can be changed. The unit must be opened for this procedure so remove power before proceeding. Remove the four nuts and screws that hold the panel in the case. Remove the panel and look at the PC board.
- Page 6 F to C Display Change The unit must be opened for this procedure so remove power before proceeding. Remove the four nuts and screws that hold the panel in the case. Remove the panel and look at the PC board. To change the digital display to C, move jumpers J6, J7, and J8 (if present) to the C position.
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