Dwyer 485B Model Digital Hygrometer Instruction Manual
- June 4, 2024
- Dwyer
Table of Contents
Dwyer 485B Model Digital Hygrometer Instruction Manual
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 fluctuate. 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 V 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 difficult 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 fit 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® MN1604, or Eveready® 522 or equivalent. Zinc- carbon types, 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.
SPECIFICATIONS
Service: Humidity, temperature, wet bulb and dew point temperature
detection in clean air.
Temperature Limits: Process: -22 to 140°F (-30 to 60°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 @ 77°F (±0.5°C @ 25°C).
Display: 4.5 digit LCD.
Resolution: 0.1%, 0.1 °F/°C.
Probe Length: 8˝ (203 mm) insertion.
Power Requirements: 9 V alkaline battery included.
Weight: 16 oz (454 g).
Agency Approvals: CE.
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.
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.
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.
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.
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.
Engineering Units
Press ENTER to see current engineering units. Press MEMORY/UP or STORE/DOWN to select another unit.
Power Management
Push 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 final installation of the Model 485B, no routine maintenance is required. The Model 485B is not field 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.
Duracell® is a registered trademark of The Gillette Company
Eveready® is a registered trademark of Eveready Battery Company, Inc
©Copyright 2021 Dwyer Instruments, Inc.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
References
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