Hygrodynamics AIRIC 1072 User manual
newport-scientific.com
P 301-498-6700
F 301-490-2313
email [email protected]om
Newport Scientific, Inc
8246 Sandy Court Suite E
Jessup, MD 20794
USA
Sampling Dew Point Hygrometer
Model 1072
1072_B 1 June 2020
Manual Revisions
Rev Date Changes
A 12/2019 Initial release
B 6/2020 Product revision update. Dew point ranges updated.
Product Revisions
When device is powered on, a product revision code will be displayed on the
LED display for 2 seconds.
Revision Date Description
R2.01 12/2019 Initial release for 1072A only.
R2.10 6/2020 Added support for ranges B, C, and E models.
Contents
Manual Revisions ..................................................................................... 1
Product Revisions ..................................................................................... 1
Contents ................................................................................................... 1
Product Overview .................................................................................... 2
Using the Airic .......................................................................................... 5
Maintenance and Adjustments ................................................................ 9
Troubleshooting ....................................................................................... 13
Specifications ........................................................................................... 17
Spare Parts & Accessories ........................................................................ 17
Warranty .................................................................................................. 18
1072_B 2 June 2020
Product Overview
The 1072 dew point hygrometer is used to measure moisture content of
process air which is at atmospheric pressure. The hygrometer has a built-in
vacuum pump which continuously draws in a small volume of process air and
provides real-time indication of dew point on an LED display. Visual and audible
alarm indicators warn when high moisture levels are detected.
The 1072 is offered in several measurement ranges, suitable for different
applications. The measurement range is determined by the sensor installed in
the unit, and is reflected in the letter suffix of the hygrometer model number.
The supplied Narrow Range Hygrosensor provides fast response to changes in
dew point.
The dew point measurement is temperature compensated, so the useful range
of each model is dependent on air temperature at the sensor. Note that the air
temperature at the sensor is typically close to ambient temperature regardless
of the process air temperature. Refer to the chart below for a summary of the
different model ranges available.
1072_B 3 June 2020
Application Suggested Model
Desiccant dryers for plastics molding 1072A
Limited dew point desiccant dryers 1072B
Hot air dryers for plastics molding 1072C or 1072D
Bulk material testing, ambient air testing 1072D or 1072E
The hygrometer and its accessories are housed in a portable carrying case.
Before using the hygrometer, familiarize yourself with the items shown below:
1072_B 4 June 2020
POWER SWITCH Turns hygrometer ON and OFF.
ALARM SWITCH Enables local audible alarm when dew point
exceeds the alarm set point.
LINE CORD Provides connection to power.
BEEPER Provides audible signal when the measured
dew point is above the alarm set point.
HIGH DEW POINT
INDICATOR
Red light is on when measured dew point is
above the alarm set point.
SAMPLE TUBING Six feet of heat resistant flexible tubing draws
in process air to be measured. Tube is 3/16”ID
X 5/16” OD.
AIR FILTER Installed in-line with sample tubing, removes
fine particulates from sample air.
DESICCANT TUBE Provides dry air for testing the hygrometer’s
response.
TUBING STORAGE
BRACKET
Allows storage for sample tubing and desiccant
tube when not in use.
ANALOG OUTPUT 0-5V output for remote monitoring or data
logging. Mates with standard 3 pin M8 female
cable.
NOTE: The 1072 is shipped with a paper desiccant pack which can be
discarded when the unit is unpacked.
1072_B 5 June 2020
Using the Airic
The 1072 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
on hot equipment. If a surface is too hot to touch, it is too hot for the 1072!
NOTE: When storing the 1072, 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.
Power Requirements
The 1072 is supplied with a 6 foot line cord for connection to power. Always
connect the hygrometer to the correct supply voltage. Do not attempt to
replace the line cord with a different plug type to accommodate other supply
voltages. The 1072 will be damaged if connected to incorrect supply voltage!
Taking Measurements
Turn the power switch ON to begin testing. The 1072 will continuously draw air
though its sample tubing. Dew point results shown on the LED display will
indicate the moisture content of air that is sampled through the tubing.
Samples can be taken of ambient air, or from environmental test chambers, or
through sample ports of any non-pressurized process air system.
Because the sampled air travels through several feet of tubing before it reaches
the internal sensor, the actual temperature at the sensor is close to ambient.
This allows hot and cold process air to be tested.
During use, the 1072 will indicate if the Hygrosensor is detecting a dew point
outside of its measurement range. Intermittent dashes in place of the dew
point reading on the LED display will flash when this occurs.
Sensor Over Range
Sensor Under Range
1072_B 6 June 2020
Bulk Material Testing
The dryness of bulk material such as plastic resin, raw materials, or food
products can be inferred from the dew point of air within the storage
container.
Depending on the shape of material and size of storage container, it may be
helpful to use a short length of metal tubing or Hygrodynamic’s sampling wand
to probe into the material. Ideally, you want to sample air near the center of
the container, surrounded by the material to be tested. Avoid testing powdery
or very fine products which may clog the 1072’s sampling system. Product in
granular form is recommended.
Plastics Molding Applications
Model 1072A is commonly used in the plastics molding industry to check for
proper dryer function. To enable testing of your process air, you should provide
fittings in your drying system that will accept the 1072A’s 3/16” ID sample
tubing. This can be a barbed hose fitting or a piece of ¼” copper tube that
penetrates your dryer’s air hoses. The point of attachment must be secure and
leak-free.
The flexible sample tubing supplied with the hygrometer can tolerate
temperatures up to 275F (135C). Higher process air temperatures can be
cooled to a safe level by sampling through a few feet of ¼” copper tubing.
Select the sample locations based on your testing needs (refer to diagram
below). It is suggested that you have permanently accessible sample points at
both the dryer output and return hoses. If your dryer has threaded test ports
on the inlet and outlet connections (typically for thermocouples) use these to
make points of connection. Some dryer manufacturers provide a port for
sampling.
1072_B 7 June 2020
Dryer Performance Testing
The performance of a resin dryer can be checked by measuring the dew point
of its output air.
Connect the 1072A sample tubing to a point on the dryer’s output line, before
the material hopper. Make sure not to exceed the sample tubing temperature
rating.
Turn on the 1072A and allow the reading to stabilize. The initial reading will be
high until all the ambient air is purged from the hygrometer’s tubing and
internal fittings. After a few minutes, the reading should start to drop until a
stable reading is obtained. It can take 30 minutes or more for the unit to
stabilize when first turned on.
NOTE: Not all dryers produce a -40F dew point. Check with your dryer
manufacturer for expected dew point levels.
Leave the 1072A connected and turned on during material drying and
processing. The built in red light and audible beeper will indicate dryer trouble
within moments of a dew point rise.
A constantly high reading on the 1072A may indicate a malfunctioning dryer or
one that is overloaded by damp material in the hopper. If you suspect that the
1072A is giving an incorrect high reading, perform the Dry-Down Test described
in the Troubleshooting section of this manual.
Material Dryness Testing
The dryness of resin in a hopper can be inferred from the dew point of air
exiting the hopper.
Connect the 1072A sample tubing to a point in the hopper’s air output. Make
Dryer
t
esting
sample location
Material testing
sample location
Dryer
Hopper
Air flow
1072_B 8 June 2020
sure not to exceed the sample tubing temperature rating.
Turn on the 1072A. When a hopper is initially loaded with material, high dew
points at the hopper’s air return are normal while moisture is removed. The
initial reading will be high until the material begins to dry. It can take many
hours to dry some materials. If drying time is expected to be all day, leave the
1072A sample tubing connected, but keep the hygrometer turned off. Every
few hours, turn on the 1072A and allow at least 30 minutes for a reading. As
the material dries, the 1072A dew point reading will start to drop. Material
processing can begin when the dew point reading is at an acceptable level.
If the 1072A reading is stuck high, change the sampling point to the output of
the dryer. Follow the instructions for Dryer Performance Testing described
above to make sure the dryer is providing low dew point air to the hopper.
Remote Monitoring/Data Logging
The 1072 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.
Pin No. Wire Color* Signal
1 Brown Ground
3 Blue Ground
4 Black 0-5V
* wire color code of standard M8 cable assemblies
Note that the output scaling is -40F to +70F.
1 3
4
Connector pinout
(front view)
1072_B 9 June 2020
Maintenance and Adjustments
The factory offers a maintenance and calibration service for the 1072. This
service should be performed annually. Alternatively, most wearable parts can
be replaced by the user.
To access the serviceable parts inside the hygrometer, the 1072 panel must be
removed from the carrying case.
Hygrometer Disassembly and Assembly
WARNING: Unplug the 1072 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.
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 the
case.
When re-assembling the panel into the case, make sure sensor cable wires are
tucked in and not pinched under the panel as you lower it into the case.
Install the 5 mounting screws, taking care not to cross thread the screws as you
proceed. The screws only need to be snug to the panel, do not overtighten!
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