MAMAC SYSTEMS HU-224 User manual

Model HU-224/225
Humidity Transducer
Technical Information
Rev. 0
7400 Flying Cloud Drive • Minneapolis, MN 55344-3720 • USA
800-843-5116 • 952-835-1626 • Fax [phone]
www.mamacsys.com
IS.HU224/225-00
For additional information, see the accompanying data sheet for this transducer.
Ordering Information
Dimensions
Figure 1. Humidity Transducer Dimensions
Specifications
Accuracy*:± 2% / ± 3% RH
Range:0 to 100% RH
Hysteresis:± 1%
Supply Voltage: 12 to 40 VDC; 12 to 35 VAC
(VDC output transducers only)
Supply Current: 10 mA maximum for VDC
output transducers; 20 mA maximum
for mA output transducers
Enclosure: 18 gage C. R. steel NEMA 4 (IP-
65) or ABS plastic
Finish: Baked-on enamel PMS2GR88B or off-white
Conformance:EMC Standards EN50082-1(1992) EN55014(1993)/EN60730-
1(1992)
Compensated Temperature Range:
-30°F to 130°F (-35°C to 55°C)
Environmental: 10 to 90% RH non-
condensing
Termination: Unpluggable screw terminal
block
Wire Size: 12 Ga. maximum
Load Impedance: 3K ohms maximum at 40 VDC (mA output transducers); 1K
ohms minimum (VDC output transducers)
Weight: Duct mount: 1.0 lb. (.45 kg); Wall mount: 0.5 lbs (.25 kg)
*Includes nonlinearity and non-repeatability.
Installation
Inspection
Inspect the transducer packaging for signs of damage. If damaged, notify the
carrier immediately.
Requirements
• Tools (not provided):
- Digital volt-ohm meter (DVM)
- Appropriate screwdriver for mounting screws
- Appropriate drill and drill bit for mounting screws
• Appropriate accessories
• Two #8 self-tapping mounting screws (not provided)
• Training: Installer must be a qualified and experienced technician
CAUTION!
• Disconnect the power supply before installing the transducer. Failure to do so
can result in electrical shock and equipment damage.
• Make all connections in accordance with the job wiring diagram and national
and local electrical codes. Use only copper conductors.
• Use electrostatic discharge precautions such as wrist straps when installing
and wiring the transducer.
• Avoid installing the transducer in locations where severe shock, vibration,
excessive moisture, or corrosive fumes are present. NEMA 4 housings are
primarily intended for outdoor use to provide a degree of protection against
windblown dust, rain, and hose-directed water.
• Do not exceed ratings for the transducer.
Mounting
Wall mount humidity transducer:
1. Locate the two Allen screws on the underside of the transducer.
2. Turn the Allen screws CCW and remove the plastic cover.
3. Select a mounting location away from diffusers, lights, or any external
influences.
4. Mount the transducer on a vertical surface with the two provided screws.
5. Pull the wires through the sub base hole and make the necessary
connections (see the wiring diagrams in Figures 4 to 13).
6. Replace the plastic cover and turn the Allen screws CW.
Duct mount humidity transducer:
1. Drill 5/8” holes in the appropriate locations for the transducer.
2. Mount the transducer on a vertical surface with two #8 self-tapping screws
(not provided).
3. Pull the wires through the knockout and make the necessary connections
(see the wiring diagrams in Figures 4 to 13).
4. Replace the cover and tighten the Phillips screws.
Wiring for mA Output
The humidity transducer is a 4 - 20 mA output unit powered with a 12 - 40 VDC
supply. Use maximum 12 AWG wire for wiring terminals. See the wiring diagrams
in Figures 4 and 5.
1. Remove the blue terminal block by carefully pulling it off the circuit board.
2. Locate the [+] and [-] terminal markings on the board.
3. Attach the supply voltage to the [+] lead.
4. Connect the 4 - 20 mA output ([-] terminal) to the controller’s input terminal.
5. Ensure that the power supply common is attached to the common bus of the
controller.
6. Reinsert the terminal block to the circuit board and apply power to the
transducer.
7. Check for the appropriate output signal by using a DVM set to DC milliamps
connected in series to the [-] terminal.
Figure 4. Wall Mount Wiring for mA Output
Figure 5. Duct Mount Wiring for mA Output
Wiring for VDC Output
The transducer is field selectable for 0 - 5 VDC or 0 - 10 VDC output and can be
powered with either 12 - 40 VDC or 12 - 35 VAC.
1. Remove the blue terminal block by carefully pulling it off the circuit board.
2. Locate the [+], [-], and [0] terminal markings on the board.
3. Attach the power wires to the [+] and [-] terminals. The [-] terminal is also the
negative output terminal.
4. Connect the [0] terminal, which is the positive VDC output terminal, to the
controller’s input.
5. Reinsert the terminal block to the circuit board and apply power to the
transducer.
6. Check the appropriate VDC output by using a DVM set to DC volts connected
to the [0] and [-] terminals.
Caution!
• If using grounded AC, ensure that the hot wire is on the [+] terminal. Also, if
using a controller without built-in isolation, use an isolation transformer to
supply the transducer.
• This transducer contains a half-wave rectifier power supply and must not be
powered from transformers powering other devices with non-isolated full-wave
rectifier power supplies.
PACKAGING ACCURACY OUTPUT
HU-224 (duct mount)
HU-225 (wall mount)
± 2%
± 3%
mA
VDC
4 - 20 mA two-wire
0 - 5 or 0 - 10 VDC
(field selectable)
Figure 2. Wall Mount Transducer
Figure 3. Duct Mount Transducer

Page 2 of 2
IS.HU224/225-00
• When multiple transducers are powered from the same transformer, damage
will result unless all 24-gage power leads are connected to the same power
lead on all transducers. Maintain the correct phasing when powering more than
one transducer from a single transformer.
Wiring the Wall Mount Humidity Transducer for VDC Output
Figures 6 and 7 illustrate proper VDC output wiring for the wall mount humidity
transducer.
Figure 6. Wall Mount Wiring for 0 - 5 VDC Output
Figure 7. Wall Mount Wiring for 0 - 10 VDC Output
Wiring the Duct Mount Humidity Transducer for VDC Output
Figures 8 and 9 illustrate proper VDC output wiring for the duct mount humidity
transducer.
Figure 8. Duct Mount Wiring for 0 - 5 VDC Output
Figure 9. Duct Mount Wiring for 0 - 10 VDC Output
Typical Applications (wiring diagrams)
Figures 10 and 11 illustrate typical wiring diagrams for the mA output humidity
transducers.
Figure 10. Wiring mA Output Transducers With an External DC
Power Supply
Figure 11. Wiring mA Output Transducers Where the Controller
or Meter Has an Internal DC Power Supply
Figures 12 and 13 illustrate typical wiring diagrams for the VDC output humidity
transducers.
Figure 12. Wiring VDC Output Transducers With an
External AC Power Supply
Figure 13. Wiring VDC Output Transducers With an
External DC Power Supply
Checkout
1. Verify that the transducer is mounted in the correct position.
2. Verify the appropriate input signal and supply voltage.
3. Verify the appropriate configuration range.
Caution!
• Do not connect 120 VAC to the humidity transducers. AC voltage should never
be supplied to a transducer intended for DC power.
Transducer Operation
This humidity transducer is a highly accurate device. For applications requiring a
high degree of accuracy, use laboratory quality meters and gages.
Calibration
All transducers are factory calibrated to meet or exceed published specifications.
If field adjustment is necessary, follow these instructions:
1. Do not verify comparative RH with a sling psychrometer. Doing so can
introduce errors into the calibration process. New humidity transducers are
already calibrated.
2. Recalibrate the humidity in a controlled environment only. Relative humidity
must be held stable while making any adjustment.
3. Verify the output from the transducer directly with calibrated instrumentation.
Verify the RH with calibrated instrumentation, not a controller output. With the
correct power applied and only a meter connected to the output of the
transducer, ensure that the output is proportional to the true RH.
4b. Single-point Calibration
Select either option 1 or option 2:
Option 1: Select a controlled humidity environment between 10 to 40% RH.
Ensure humidity is stable and adjust the zero trimmer [Z].
Option 2: Select a controlled humidity environment between 40 to 70% RH.
Ensure humidity is stable and adjust the span trimmer [S].
4b. Two-point Calibration
Select a controlled humidity environment between 10 and 40% RH. Ensure
humidity is stable and adjust the zero trimmer [Z]. Then select a controlled
humidity environment between 70 and 75% RH. Ensure humidity is stable
and adjust the span trimmer [S].
Maintenance
Perform regular maintenance on the total system to ensure the sustained
optimum performance of the humidity transducer.
Field Repair
Do not attempt to repair the humidity transducer. Replace the malfunctioning
transducer with a functional transducer if necessary.
Warranty
See the accompanying data sheet for additional information. For technical /
application assistance, call your nearest office.
Copyright ©Mamac Systems 2003. All rights reserved.
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