Dwyer Instruments 485B Operating instructions

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 humdity 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 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 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®N1604, 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.
PECIFICATION
ervice: 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.
Model 485B Digital Hygrometer
pecifications and Operating Instructions
Bulletin TE-485B
DWYER IN TRUMENT , INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U. .A. Fax: [phone] e-mail: [e-mail]
OPERATING IN TRUCTION
Duracell® is a registered trademark of The Gillette Company
Eveready® is a registered trademark of Eveready Battery Company, Inc.
www. .com [e-mail]1.800.561.8187

DWYER IN TRUMENT , INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U. .A. Fax: [phone] e-mail: [e-mail]
©Copyright 2012 Dwyer Instruments, Inc. Printed in U.S.A. 1/12 FR# 02-443917-00
MENU
HOLD
Maximum
Minimum
Memory
Engineering Units
Power Management
Memory torage and Retrieval
HOLD will appear on the home screen when the HOLD button is pressed,
indicating the process reading has been frozen.
Push ENTER to see the maximum recorded reading. When viewing the
maximum recorded reading, hold ENTER for 4 seconds to clear.
Push ENTER to see the minimum recorded reading. When viewing the
minimum recorded reading, hold ENTER for 4 seconds to clear.
Press ENTER to see . Hold ENTER for 4 seconds to clear all stored
memory locations.
Press ENTER to see current engineering units. Press MEMORY/UP or
STORE/DOWN to select another unit.
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.
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.
MAINTENANCE/REPAIR
Upon final installation of the odel 485B, no routine maintenance is
required. The odel 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.
www. .com [e-mail]1.800.561.8187