Extech Instruments 445580 Bedienungsanleitung

User Manual

Hygro-Thermometer Pen

Model 445580

Introduction

Congratulations on your purchase of the Extech Hygro-Thermometer Pen Model 445580. The

445580 can measure Relative Humidity from 10% to 90% and Temperature from 14 to 122oF (0 to

50oC). Advanced features include MIN/MAX Memory, Push-button Calibration, Display Hold, and

Automatic Power Off.

Meter Description

1. Humidity/Temperature Sensor

2. POWER ON/OFF button

3. Data HOLD button

4. MIN/MAX Memory button

5. Calibration and units select button

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Operation

Press the ON/OFF button to turn the meter ON. After a 5-second initialization, the Relative Humidity

reading will appear in the upper display and the Temperature reading will appear in the lower

display. Allow time for measurement readings to stabilize when moving the meter from one area to

another.

Displayed Error Messages

An error message will appear on the display if the meter fails an internal diagnostic test.

E2: Calibration error. Recalibration is necessary.

E5: Relative Humidity sensor failure. Repair/replacement is necessary.

Data Hold

1. Press the HOLD button to freeze the displayed reading. The display icon ‘HLD’ and the held

reading will appear on the display.

2. To return the meter to the normal operation mode, press and hold the RESET button until the

‘HLD’ icon switches off.

MIN-MAX Memory

1. Press and hold the MIN/MAX button until ‘MIN’ appears in the display. The reading will then

represent the lowest humidity and temperature measurements recorded since the meter was

turned on or last reset.

2. Press and hold the MIN/MAX button until the ‘MAX’ appears on the display. The reading will

then represent the highest humidity and temperature measurements recorded since the meter

was turned on or last reset.

3. Press the MIN/MAX key again to return to normal operation.

4. To reset (clear) the MIN/MAX memory, press and hold the RESET button until ‘88.8’ appears in

the display.

Automatic Power OFF (Sleep mode)

The meter will automatically shut off after a period of approximately 20 minutes. To defeat this

mode, press and hold the MIN/MAX button while turning the meter on. Release the ON/OFF button

after the display initializes. 'n' will appear on the display indicating that the non-sleep mode has

been activated. Note that Sleep mode will be re-activated when the meter is turned off.

Selecting Temperature Units (C or F)

Caution: Follow this procedure carefully. Accidentally pressing the RESET button during this

procedure will compromise the meter's calibration.

1. Ensure that the meter is off.

2. Press and Hold the recessed F/C button (use a paper clip or similar object) and then press the

ON/OFF button. The unit will power up and the display will flash once. When only the ‘F’ and ‘C’

icons appear together in the display, release the F/C button.

3. The display will then show either ‘C’ or ‘F’. Press the MIN/MAX key to select degrees ‘C’ or ‘F’.

The display will reflect the change.

4. Press the recessed F/C button to store the selection. ‘S’ will appear in the display.

5. The display will then show ‘%MIN’. Turn off the meter to complete the operation.

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Calibration and Verification Procedures

The following procedures require 33% & 75% RH references available through Extech. The meter

should be placed in a room temperature environment for the duration of the calibration.

Verification (Checking the 33% or 75% RH Calibration)

Skip the verification and go directly to the Cal procedure below if it has already been determined

that the meter calibration is compromised or if the E2 display appears.

1. Insert meter’s sensor into the 33% or 75% salt reference bottle

2. Wait 40 minutes and then check if the reading is within the published specifications

Relative Humidity Calibration (33% and 75%)

The 33% and the 75% calibrations must both be performed.

1. Start with the meter OFF.

2. Insert the meter’s sensor into the 33% salt reference bottle. Allow the meter to

stabilize for 40 minutes. Note that for diagnostic purposes the stabilization

process can be shortened to 5 minutes.

3. While holding down the recessed CAL button with a paper clip, press and

release the ON-OFF button. Continue to hold down the CAL button, the unit will

turn ON and the display will flash once.

4. When only the F and C icons appear, release the CAL button.

After releasing the CAL button, the display will indicate either F

or C (depending on which one was selected).

5. Press and hold the RESET button for 3 seconds. %MIN will

appear in the display after the RESET button is released.

6. Press and release the CAL button. ‘S’ will briefly display

followed by %MAX display.

7. Turn the meter OFF. Insert the meter sensor into the 75% salt

reference bottle and wait 40 minutes.

8. While holding down the recessed CAL button with a paper clip, press and release the ON-OFF

button. Continue to hold down the CAL button, the unit will turn ON and the display will flash

once.

9. When only the F and C icons appear, release the CAL button.

After releasing the CAL button, the display will indicate either F

or C.

10. Press and hold the RESET button for 3 seconds. %MIN will appear in the

display after the RESET button is released.

11. Press and hold the RESET button again for 3 seconds. %MAX will appear

after the key is released.

12. Ensure that %MAX is displayed and then press

CAL. ‘S’ will appear briefly and the meter will

return to normal operation. Turn the power OFF;

calibration is complete.

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Battery Replacement

Use a coin to remove the battery compartment cover on the rear of the meter. Replace the 2032

lithium battery; install the new battery face up (+) in the battery compartment.

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate collection

sites, the retail store where the batteries were purchased, or wherever batteries are sold.

Disposal: Do not dispose of this instrument in household waste. The user is obligated to

take end-of-life devices to a designated collection point for the disposal of electrical and

electronic equipment.

Specifications

Relative Humidity Sensor

High Precision thin-film capacitance type

Temperature Range

-10 to 50oC (14 to 122oF)

Relative Humidity Range

10 to 90% Relative Humidity

Resolution

Temperature: 0.1o; Relative Humidity: 0.1%

Accuracy (32 to 122oF & 0 to 50oC)

Temperature: ±1.0oC (±1.8oF); RH: ±5%

Power

2032 button battery (150 hour battery life)

Response time

120 seconds

Dimensions

175 x 42 x 16mm (6.9 x 1.6 x 0.6")

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