Table of Contents
Troubleshooting
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Summary of Contents for Newport Hygrodynamics 8074A
- Page 1 Portable Dew Point Monitor Model 8074A newport-scientific.com Newport Scientific, Inc P 301-498-6700 8246E Sandy Court F 301-490-2313 Jessup, MD 20785-9632 email sales@newport-scientific.com hygrotechnical@newport-scientific.com...
- Page 2 8074A_B.docx October 2016...
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Page 3: Table Of Contents
Contents Specifications ................1 Product Overview ................ 2 Features and Accessories ............3 Operation ..................5 Sample Tubing Connection ............5 Power Connection ..............6 Dryer Performance Testing ............. 6 Material Dryness Testing ............7 Remote Monitoring/Data Logging ........... 9 Maintenance and Adjustments .......... -
Page 4: Specifications
Specifications DEW POINT RANGE +10F to +70F (at 73F air temp) (varies with ambient air 0F to +50F (at +50F air temp) temperature) +35F to +90F (at 100F air temp) TYPICAL ACCURACY ±3F MAX. PROCESS AIR TEMP. 275F ALARM SET POINT +50F dew point (adjustable) SENSOR PART NUMBER 1826-2... -
Page 5: Product Overview
Product Overview The 8074A dew point monitor is used to test the moisture content of industrial process air. The measurement range of the 8074A makes it ideal for testing the function of refrigerant dryers, dehumidifiers, and hot air dryers. The 8074A has an integrated vacuum pump which continuously draws in a small sample of process air and provides real-time indication of dew point on an LED display. -
Page 6: Features And Accessories
Features and Accessories The dew point monitor and its accessories are housed in a heavy-duty portable carrying case. When not in use, all parts of the product are contained within the case, protected from the elements and safeguarded from loss. 8074A_B.docx February 2017... - Page 7 POWER SWITCH Turns monitor ON and OFF. ALARM SWITCH Enables local audible alarm when dew point exceeds the alarm set point. LINE CORD Provides connection to power. BEEPER (not Gives audible signal when the measured shown) dew point is above the alarm set point. DEW POINT Green light is on when dry air is detected, CONDITION...
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Page 8: Operation
Operation The 8074A is designed to sample process air that is near atmospheric pressure, NOT compressed air. If you are attempting to monitor compressed air, consult the factory for other model options. CAUTION: The carrying case is not heat resistant. It may melt or distort if left resting on the hot parts of a heated dryer. -
Page 9: Power Connection
Material testing sample location Hopper Air flow Dryer Dryer testing sample location Typical material drying system NOTE: When storing the 8074A, carefully coil the sample tubing and tuck it behind the tubing storage bracket. This will prevent kinks from forming in the tubing when the lid is closed. -
Page 10: Material Dryness Testing
Connect the 8074A sample tubing to a point on the dryer’s output line, before the hopper. Make sure not to exceed the sample tubing temperature rating. Turn on the 8074A and allow the reading to stabilize. The initial reading will reflect the current room dew point until all the ambient air is purged from the monitor’s tubing and internal fittings. - Page 11 monitor turned off. Every few hours, turn on the 8074A and allow time to obtain a stable reading. As the material dries, the 8074A dew point reading will start to drop. Material processing can begin when the dew point reading is at an acceptable level. If the 8074A reading is stuck at a high dew point, change the sampling point to the output of the dryer.
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Page 12: Remote Monitoring/Data Logging
Remote Monitoring/Data Logging The 8074A analog output jack can be used to monitor or log dew point over a period of time. The output jack is a 3 pin male M8 type connector. This connector accepts standard threaded or snap fit female M8 cables. -
Page 13: Maintenance And Adjustments
Maintenance and Adjustments Newport Scientific offers a maintenance and calibration service for the 8074A. This service should be performed annually. Alternatively, most wearable parts can be replaced by the user. To access the serviceable parts inside the monitor, the 8074A panel must be removed from the carrying case. -
Page 14: Sensor Replacement
Sensor Replacement The internal sensor should be replaced on a yearly basis. It is difficult to verify the accuracy of the sensor in the field. For most users, an annual sensor replacement can assure good operation of the monitor. It is recommended to replace the sample tubing and air filter whenever the sensor is replaced. - Page 15 Plug the new sensor into the 4 pin insert. Align the notch on the sensor PC board with the notch on the back of the 4 pin insert. Push in firmly by holding the PC board. The sensor will not seat fully down into the insert, this is normal.
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Page 16: Display Units
Display Units The 8074A is factory set to display dew point in F. The display can be changed to C by jumper configuration. With the 8074A panel removed from the carrying case, locate the configurable parts near the upper left corner of the PC board. - Page 17 Apply power to the unit and turn it on with care, making sure not to touch any electrical terminals inside. Configure the S1 switch as shown here, with SET1 position ON and all others OFF. In this configuration, the front panel display will indicate the current alarm set point.
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Page 18: Troubleshooting
Troubleshooting Dry-Down Test The desiccant tube is used to provide a reliable source of dry air for field testing the monitor’s response. Follow this procedure if the monitor indicates a constant high dew point but you suspect that your process air is dry. The desiccant tube generates a dew point well below the measurement capability of the 8074A, so it won’t test the accuracy of the monitor, but it can help troubleshoot a damaged sensor or internal air leaks. -
Page 19: Troubleshooting Hints
Troubleshooting Hints Monitor display is stuck near 70F Possible Cause Corrective Action Damp sample tubing or If high dew point air was sensor housing recently sampled, there may be condensation in the tubing and fittings. Perform the Dry-Down test to purge the system of moisture. - Page 20 Monitor reads near 0F when turned on and doesn’t change Possible Cause Corrective Action Sensor cable disconnected Disassemble the monitor and make sure sensor wires are plugged into the 4 pin insert. Confirm that the wires are in the correct order (refer to Sensor Replacement section).
- Page 21 Monitor is slow to respond Possible Cause Corrective Action Inadequate 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 4 pin insert holding the sensor may be cracked and leaking.
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Page 22: Spare Parts & Accessories
Spare Parts & Accessories Item Part No. Sensor 1826-2 Air filter 3305005 High temp sample tubing (per ft) 4100133 4 pin insert 0900104 Gasket for insert 1000613G Desiccant tube 6245 Field wireable analog out connector 0300201 8074A_B.docx February 2017... -
Page 23: Warranty
Seller to any subsequent purchaser. WARRANTIES: OTHER PRODUCTS NEWPORT SCIENTIFIC, INC. makes no express or implied warranty as to items, which are the products of other manufacturers. Seller shall use its best efforts to obtain from the manufacturer, in accordance with its customary practice, the repair or replacement of such products may prove defective in workmanship or material. - Page 24 Newport Scientific, Inc P 301-498-6700 8246E Sandy Court F 301-490-2313 Jessup, MD 20785-9632 email sales@newport-scientific.com hygrotechnical@newport-scientific.com...
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