Hygrodynamics 8075A User manual
8075A_B.docx February 2017
8075A_B.docx February 2017
Contents
Specifications............................................................................... 1
Product Overview........................................................................ 2
Features and Accessories ........................................................ 3
Operation .................................................................................... 5
Sample Connection Requirements.......................................... 5
Power Connection ................................................................... 6
Dryer Testing ........................................................................... 6
Remote Monitoring/Data Logging........................................... 8
Maintenance and Adjustments ................................................... 9
Sample Hose Replacement...................................................... 9
Filter Replacement .................................................................. 9
Monitor Disassembly............................................................. 10
Sensor Replacement.............................................................. 11
Backpressure Orifice Inspection............................................ 12
Display Units & Alarm Set Point Adjust................................. 13
Troubleshooting ........................................................................ 15
Spare Parts & Accessories ......................................................... 18
Notes ......................................................................................... 19
Warranty.................................................................................... 20
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Specifications
DEW POINT RANGE
-40F to +15F (-40C to -9C)
TYPICAL ACCURACY
±3F (±1.7C)
USABLE PRESSURE RANGE
20psig to 150psig
COMPRESSED AIR
CONSUMPTION
< 5SCFH
ALARM SET POINT
-10F (-23C)
SAMPLE AIR CONNECTION
Industrial interchange
coupling set with 1/4” NPT
male threads
SENSOR PART NUMBER
1205DM
ANALOG OUTPUT SCALING
-40F to +70F (-40C to -9C)
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”
NET WEIGHT
5.7lbs
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Product Overview
The 8075A dew point monitor is used to check the function of a
desiccant dryer in a compressed air system. The monitor uses
an internal bleed orifice to continuously sample a small amount
of process air. The internal sensor is exposed to the line
pressure of the compressed air system and therefore reads
actual pressure dew point. Real-time dew point is displayed on
a large numeric LED display.
The monitor samples process air through six feet of flexible
hose which terminates in a standard 1/4” industrial quick
connect plug. This allows quick and easy testing of air wherever
a compatible quick connect is installed in the air distribution
piping. Just plug in the sample hose and wait for a dew point
reading.
In addition to the numeric LED display, the monitor includes
dew point condition indicator lights, and audible alarm, and a
linear signal output.
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Features and Accessories
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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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
visible in picture)
Provides audible signal when the measured
dew point is above the alarm set point.
DEW POINT
CONDITION
INDICATORS
Green light is on when dry air is detected,
red light is on when measured dew point is
above the alarm set point.
LINE PRESSURE
GAUGE
Indicates actual air pressure at the sensor
housing inside the monitor.
SAMPLE HOSE
ASSEMBLY
Six feet of pressure resistant hose connects
monitor input port to compressed air test
location.
FILTER
Filter removes particulates from sample air.
HOSE STORAGE
CLIP
Secures sample hose when not in use.
QUICK CONNECT
1/4” industrial quick connect to install in
compressed air piping.
ANALOG OUT
4-20mA and 0-5V output for remote
monitoring or data logging. Mates with
standard 3 pin M8 female cable.
NOTE: The 8075A is shipped with a paper desiccant pack
which can be discarded when the unit is unpacked.
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Operation
The 8075A is designed to sample compressed air. If you are
attempting to monitor air at atmospheric pressure, you need a
vacuum assisted monitor, 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. If a
surface is too hot to touch, it is too hot for the monitor!
Sample Connection Requirements
The 8075A is supplied with a 1/4” industrial interchange style
quick connect plug attached to 6 feet of sample hose. This plug
is compatible with many shop air quick connect sockets,
although a compatible socket is supplied with the monitor
which can be used as a dedicated test port in your compressed
air distribution line.
For best results, select a sample point that is close to the dryer
output. Avoid sampling at remote locations in your air
distribution system. Sections of air distribution piping which
serve little-used tools or terminate with a dead-end are not
good sampling points. The air in such lines can be stagnant and
won’t represent the actual condition of air that the dryer is
producing.
NOTE: sampled air should be free of debris and oil mist.
Particulates can clog the air bleed orifice and oil will damage
the sensor. Also, the air should not be saturated with water!
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If air lines are wet, don’t connect the 8075A or sensor damage
might occur.
Power Connection
The 8075A is supplied with a 6 foot line cord for connection to
power. Always connect the monitor to the correct supply
voltage. Do not attempt to replace the line cord with a different
plug type to accommodate other supply voltages. The 8075A
will be damaged if connected to incorrect supply voltage.
Dryer Testing
CAUTION: Inspect the sample hose assembly before
connecting the monitor to a source of compressed air. If the
hose fittings are loose or there are signs of hose damage
(bulging, surface cuts, or frayed fibers) DO NOT use the
monitor until the hose is replaced!
Connect the 8075A sample hose plug to a compatible quick
connect socket in your air distribution line. The monitor will
begin to bleed air from the line as soon as it’s connected. Make
sure the pressure gauge on the monitor agrees with the line
pressure in your air system. If the monitor gauge reads
significantly lower than your actual air pressure, this might
indicate a plugged sample air filter. This pressure drop will
affect the accuracy of the monitor!
Turn on the 8075A and allow the reading to stabilize. The initial
reading will be +15F (-9C) until all the ambient air is purged
from the monitor’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
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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 8075A connected and turned on to continuously
monitor dryer conditions. 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 8075A may indicate a
malfunctioning dryer.
NOTE: When storing the 8075A, carefully coil the sample hose
and snap the crimped metal ferrule into the storage clip. This
will prevent kinks from forming in the hose when the lid is
closed.
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