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165910 Dew Point Meter 8072A Manual

4

June 2014

Product Overview

The 8072A dew point monitor is used to check the output dew
point of a desiccant dryer. The monitor has a built-in vacuum
pump which draws sample air to be measured and provides
real-time indication of dew point on an LED display. Visual and
audible alarm indicators warn when high dew points are
detected.

The dew point monitor and its accessories are housed in a
portable carrying case. Before using the monitor, familiarize
yourself with the features shown below:

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Summary of Contents for 8072A

Page 1: ......

Page 2: ...165910 Dew Point Meter 8072A Manual 1 June 2014 ...

Page 3: ...e Tubing Connection 6 Power Connection 7 Dryer Performance Testing 7 Remote Monitoring Datalogging 8 Maintenance and Adjustments 9 Monitor Disassembly and Assembly 9 Sensor Replacement 10 Display Units Alarm Set Point Adjust 10 Troubleshooting 13 Dry Down Test 13 Troubleshooting Hints 14 Spare Parts 16 Warranty ...

Page 4: ...o 15qF 40qC to 9qC TYPICAL ACCURACY 3qF 1 7qC ALARM SET POINT 10qF 23qC SENSOR PART NUMBER 112254 ANALOG OUTPUT SCALING 40qF to 70qF 40qC to 9qC ANALOG OUTPUT PORT 3 pin M8 male jack POWER REQUIREMENTS 115VAC 50 60HZ 0 15A max 230VAC optional DIMENSIONS 10 75 X 9 75 x 4 75 WEIGHT 7 0lbs ...

Page 5: ...r has a built in vacuum pump which draws sample air to be measured and provides real time indication of dew point on an LED display Visual and audible alarm indicators warn when high dew points are detected The dew point monitor and its accessories are housed in a portable carrying case Before using the monitor familiarize yourself with the features shown below ...

Page 6: ...bove the alarm set point SAMPLE TUBING Six feet of heat resistant tubing draws in process air to be measured AIR FILTER Installed in line with sample tubing removes fine particulates from sample air DESICCANT TUBE Provides dry air for testing the monitor s response TUBING STORAGE BRACKET Allows storage for sample tubing and desiccant tube when not in use ANALOG OUT 4 20mA and 0 5V output for remot...

Page 7: ... testing of your process air you must provide fittings in your drying system that will accept the 8072A s 3 16 ID sample tubing This can be a barbed hose fitting or a piece of copper tube that penetrates your dryer s air hoses This point of attachment must be secure and leak free Some dryer manufacturers provide a port for sampling Check your dryers owner s manual for its location if available The...

Page 8: ...eplace the line cord with a different plug type to accommodate other supply voltages The 8072A will be damaged if connected to incorrect supply voltage Dryer Performance Testing The performance of a dryer can be evaluated by measuring the dew point of its output air Connect the 8072A sample tubing to a point on the dryer s output line before the hopper Make sure not to exceed the sample tubing tem...

Page 9: ...icate dryer trouble within moments of a dew point rise A constantly high reading on the 8072A may indicate a malfunctioning dryer or one that is overloaded by damp material in the hopper If you suspect that the 8072A is giving an incorrect high reading perform the Dry Down Test described in the Troubleshooting section of this manual Remote Monitoring Data logging The 8072A analog output jack can b...

Page 10: ...om the carrying case Monitor Disassembly and Assembly WARNING Unplug the 8072A from power before disassembly Even with the power switch off voltages are present inside the unit Slide the sample tubing off of the front panel elbow Use a screwdriver to remove the 5 screws along the perimeter of the panel holding it in the case Use the sample tubing elbow to help lift the panel straight up and out of...

Page 11: ... air filter whenever the sensor is replaced With the panel removed from the case locate the sensor housing and pull the sensor cable connector from the housing The cable will unplug straight out Unscrew the hex nut from the top of the sensor housing With the hex nut unscrewed remove the sensor and insert along with gasket The sensor will then unplug from the insert Replace sensor and inspect gaske...

Page 12: ... upper left corner of the PC board Move J6 and J7 jumpers to the C position to display dew point in qC To change the dew point at which the monitor indicates an alarm high dew point indication use the DISPLAY MODE SWITCH labeled S1 and the ALARM ADJUST potentiometer labeled SET1 WARNING The alarm set point adjustment is performed with the 8072A powered on Avoid touching live electrical parts durin...

Page 13: ...l display will indicate the current alarm set point Adjust the SET1 Alarm Adjust potentiometer located on the circuit board to the desired set point When the front panel display indicates your desired set point return the S1 switches to the normal operating configuration The front panel display will now show the actual measured dew point note that most ambient air will cause the monitor to read 15...

Page 14: ...ed in a 350 F oven for one hour This can also be done in a microwave oven for 10 minutes set on high Allow desiccant to cool and replace back in tube Remove the yellow caps from the ends of the desiccant tube save them for re use Connect the sample tubing to one end of the desiccant tube and the sample air outlet to the other end This will create a closed loop of dry air flow through the monitor a...

Page 15: ...e sampling suction With monitor on use finger to block sample tubing If you don t feel suction the vacuum pump may be worn or damaged or the 2 pin insert holding the sensor may be cracked and leaking Monitor should be serviced Sensor worn or contaminated Using a fresh desiccant tube perform the Dry Down test If response is slow replace sensor Sampled air is not dry Sampled air must have a dew poin...

Page 16: ...s plugged into the 2 pin insert Sensor broken or missing Unplug the sensor cable and short the cable pins together with a jumper wire Turn monitor on and check for 15qF on display If so the sensor needs replaced Circuit board defective Unplug the sensor cable and short the cable pins together with a jumper wire Turn monitor on and check for 15qF on display If display stays at 40q the monitor needs...

Page 17: ...ay be cracked and leaking Monitor should be serviced Sensor worn or contaminated Using a fresh desiccant tube perform the Dry Down test If response is slow replace sensor Sample tubing or air filter is dirty Inspect sample tubing and air filter and replace if loaded with resin dust Spare Parts Item Part No Sensor 112254 Air filter 103808 High temp sample tubing per ft 4100133 2 pin insert 0900106 ...

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