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Model 485B Digital Hygrometer
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®
Specications - Installation and Operating Instructions
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Bulletin TE-485B
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MODEL 485B Digital Thermo-Hygrometer is a versatile, compact, hand-held
instrument for measuring percentage of relative humidity and temperature in °F or
°C. Dew point and wet bulb temperatures are derived from relative humidity and
temperature measurements and displayed on the LCD. The hold key freezes the
current temperature and relative humidity readings for situations where readings
uctuate. Store up to 99 readings with the non-volatile memory function – ideal for
technicians needing to take multiple readings for later analysis.
Battery Installation
The unit is shipped with a separate 9 volt alkaline battery which must be installed
before operation. Remove the two screws holding the bottom endcap in place and
remove it. Connect the battery to the enclosed battery clip, observing correct polarity.
Be careful not to trap the wires between the case or foam pad which retains the battery.
This could make it difcult to install the battery or remove it later for replacement.
Be sure the rubber gasket is properly seated in the gasket channel and replace the
endcap. Note that the endcap will only t one way because the holes are slightly off-
center. Place the “Z” shaped wrist strap clip in one of the screw recesses and replace
the screws. Do not overtighten. Attach the wrist strap to the clip.
When battery replacement becomes necessary, use only 9 volt alkaline type batteries
such as a Duracell
often labeled Heavy-Duty are not recommended because of their shorter life and an
increased potential for leakage. Alkaline batteries are a better value because they last
typically up to three times longer in this device.
Low Battery Indicator
A weak battery may cause improper operation or inaccurate measurements. A low
battery indicator ( ) is provided on the display to show when the battery needs to
be replaced. Although the unit may appear to function and read properly, the accuracy
of the readings cannot be guaranteed when the ( ) indicator is empty of power
segments. Replace the battery with a fresh one. Do not leave an exhausted battery in
the unit due to potential battery leakage.
®
MN1604, or Eveready® 522 or equivalent. Zinc-carbon types,
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SPECIFICATIONS
Service: Humidity, temperature, wet bulb and dew point temperature detection in
clean air.
Temperature Limits: Process: -40 to 176°F (-40 to 80°C); Ambient: 5 to 125°F (-15
to 51°C).
Range Relative Humidity: 0 to 100% (non-condensing).
Accuracy Relative Humidity: ±2% FS over 10 to 90% @ 77°F (25°C).
Range Temperature: -20 to 140°F (-28 to 60°C).
Accuracy Temperature: ±0.9°F @ 72°F (±0.3°C @ 25°C).
Display: 4.5 digit LCD.
Resolution: 0.1%, 0.1 °F/°C.
Probe Length: 8˝ (203 mm) insertion.
Power Requirements: 9V alkaline battery included.
Weight: 16 oz (454 g).
Agency Approvals: CE, RoHS.
OPERATING INSTRUCTIONS
ON/OFF/LIGHT
A single press turns unit on, and a second press turns unit off. While unit is on, hold for
2 seconds to turn on the backlight. If the light is active, press once to turn the light off
and another to turn the unit off.
HOLD
A single press freezes the current reading and a second press resumes live process
reading.
MENU
A single press will display the menu. Hit MENU while in the main menu to go back to
the home screen or while in the sub-menus to back up one level.
ENTER
When in the home screen, press to cycle through temperature, dew point, and wet
bulb. While in the menu, press to enter sub-menus or values. Press and hold for 4
seconds to clear MAX, MIN, or MEM in their respective menus.
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99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
DWYER INSTRUMENTS, INC.
MEMORY/UP
A singles press will retrieve stored data points in the memory. Each successive press
will scroll to the next saved memory location ST01, ST02, etc. While in the menu, it
becomes the UP button.
STORE/DOWN
A single press will store the current reading on the screen. ST01, ST02, etc. shows in
the display to indicate the memory location where the reading was saved. While in the
menu, it becomes the DOWN button.
Duracell® is a registered trademark of The Gillette Company
Eveready® is a registered trademark of Eveready Battery Company, Inc.
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DEW POINT/WET BULB DISPLAY
In the home screen, press ENTER to cycle through temperature, dew point, and wet
bulb. While doing this, the humidity reading will always remain at the top.
Average
Press ENTER to view the AVG function. This function will adjust the process reading
on the home screen to report the average reading over the period of selected time.
Press MEMORY/UP or STORE/DOWN to select between 0, 30, or 60 second values.
Push ENTER to store the desired value.
Memory
Press ENTER to see CLr. Hold ENTER for 4 seconds to clear all stored memory
locations.
HOLD
HOLD will appear on the home screen when the HOLD button is pressed, indicating
the process reading has been frozen.
Memory Storage and Retrieval
From the home screen, push MEMORY/UP to view all previously stored values. Cycle
up or down through the stored data with the MEMORY/UP or STORE/DOWN buttons.
From the home screen, press STORE/DOWN to store data points to memory. For both
data storage and data memory retrieval, press MENU to return to the home screen.
MENUS
Maximum
Push ENTER to see the maximum recorded reading. When viewing the maximum
recorded reading, hold ENTER for 4 seconds to clear.
Minimum
Push ENTER to see the minimum recorded reading. When viewing the minimum
recorded reading, hold ENTER for 4 seconds to clear.
Engineering Units
Press ENTER to see current engineering units. Press MEMORY/UP or STORE/
DOWN to select another unit.
Power Management
Pu sh ENTER to see current time off setting. Select 30 or 10 values indicating minutes
for power to automatically shut-off. By selecting 0, the auto shut-off is disengaged and
the unit will only turn off manually by the ON/OFF/LIGHT button.
Factory Restore
This function allows the user to restore the unit to factory settings. Press ENTER to
view the restore function. CLr will be shown on the display. Press and hold ENTER
for 4 seconds until CLrd is displayed. The unit will then be restored to factory defaults.
MAINTENANCE/REPAIR
Upon nal installation of the Model 485B, no routine maintenance is required. The
Model 485B is not eld serviceable and should be returned if repair is needed. Field
repair should not be attempted and may void warranty.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact
customer service to receive a Return Goods Authorization number before shipping the
product back for repair. Be sure to include a brief description of the problem plus any
additional application notes.
This product uses FreeRTOS (www.FreeRTOS.org) version 7.0.1. A copy of the original Free RTOS
source shall be provided upon request.
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
©Copyright 2015 Dwyer Instruments, Inc. Printed in U.S.A. 10/15 FR# 443917-00 Rev. 2
DWYER INSTRUMENTS, INC.
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