Dwyer Instruments 485B Mode d'emploi

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: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U. .A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

OPERATING IN TRUCTION

Duracell® is a registered trademark of The Gillette Company

Eveready® is a registered trademark of Eveready Battery Company, Inc.

www. .com information@itm.com1.800.561.8187

DWYER IN TRUMENT , INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U. .A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

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 information@itm.com1.800.561.8187

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