ATP Electronics ET-931 User Manual

User's Manual

Professional Humidity & Temperature Meter

Please read this user's manual thoroughly before using this

unit and keep it properly for your future

Contents

1. Safety ...................................................................... 1

2.Introduction .............................................................. 2

3.Features ................................ .................................... 2

4.Specifications ........................................................... 3

5.Meter Description ..................................................... 4

6.LCD Display Description ......................................... 5

7.Operation Instruction ................................................ 6

8.Notes ........................................................................ 8

9.Accessories ............................................................... 9

1

1. Safety

Read the following safety information carefully before

attempting to operate or service the meter.

Use the meter only as specified in this manual; otherwise, the
protection provided by the meter may be impaired.

◆ Environment conditions:

RH≤90％（Non-Condensation）
Operating Temperature: -20℃~70℃

Storage Temperature: -30℃~70℃

◆ Maintenance
Repairs or servicing not covered in this

manual should only be performed by qualified personnel.

Wipe the unit with a dry soft cloth. Do not use abrasives or
solvents on this instrument.

◆ Safety Symbol

Comply with EMC

2

2. Introduction

The Humidity & Temperature Meter is designed with a high
accuracy temperature & humidity sensor, providing high
accuracy, fast response and stable readings. It is widely used for
monitoring and collecting data of environment temperature and
humidity.
This meter is widely used for measurement of temperature and
humidity of room, metro, library, commercial center,
communication center room, etc.

3. Features

◆ Temperature units: ℃/℉

◆ MAX record

◆ MIN record

◆ Data hold

◆ Dew Point Temperature measurement

◆ Backlight display

◆ Resolution: 0.1%RH, 0.1℃

◆ Low battery indication

3

4. Specifications

Humidity range

0~100%RH

Humidity accuracy

0~20%RH，80%~100%RH

±4.0%

20% ~40%RH，60% ~ 80%RH

±3.0%

40% ~ 60%RH

±2.5%

Temp. range

-20℃~70℃(-4℉~158℉)

Temp. accuracy

-20℃~70℃(-4℉~158℉)

±1.0℃/±1.8℉

Dew Point temp. range

-20℃~70℃(-4℉~158℉)

Dew Point temp. accuracy

25℃;40%~100%RH

±1.0℃/±1.8℉

Display

3 1/2 digits

Data update

1 times/sec

Auto power off

Meter automatically shuts down after
approx. 15 minutes inactivity.

Power supply

One 9V battery, 006P or IEC 6F22 or
NEDA 1604.

Battery life

at least 30 hours

Operating conditions

-20℃~70℃，10％RH~90％RH

Storage conditions

-20℃~70℃，10％RH~75％RH

Dimension(L*W*H)

151g

Weight:

158*62*32mm

4

5. Meter Description

①Temp.& Humidity sensor ②LCD display
③℃/℉ selection key ④MAX/MIN selection key

⑤SET key ⑥Backlight ON/OFF key

⑦Power ON/OFF key ⑧Battery compartment

5

6. LCD Display Description

① Battery icon
② Data hold icon
③ MAX icon
④ MIN icon
⑤ Humidity unit icon
⑥ Humidity record
⑦ Temperature units icon
⑧ Temperature record
⑨ Timing power off icon
⑩ Dew point temperature icon

6

7. Operation Instruction

(1) Open battery cover and install a 9-volt battery in the battery
compartment.

(2) Power ON: Turn the meter on by pressing " " button for
1 second until the LCD is lighted, then loose the button.

(3) Power OFF: Turn the meter off by pressing and holding
" " button for approx. 3 seconds until the LCD is switched

off, then loose the button.
(4) When the low battery icon " " appears, replace the

meter's battery.
(5) ℃/℉ Selection

In the measuring mode, press " " button to convert the

temperature units ℃ or ℉.
(6) “ ” button function

1) Hold: press " " button once, "HOLD" icon will appear
on the LCD, which indicates the data is freezed. To release the

held reading, press the button again.

2) MAX/MIN record
Press and hold " " button for three seconds, MAX icon

will appear on the LCD, which indicates the current maximum

7

reading, press this button again to enter into MIN mode. Then
keep pressing " " for three seconds to exit MAX/MIN

mode.
(7) “ ” button function

① Auto power off
Press " " button once to power on or off the meter.

When” ” icon displayed on the screen, it indicates that the

meter will automatically turn off after approx. 15 minutes of
inactivity.

If there is no “ ” icon displayed on the screen, it indicates the

power off function is disabled.
② Dew Point Temperature

Press and keep the " " button for three seconds until
“DEW” icon appears on the LCD, which indicates the dew point

temperature measurement is conducting. Then keep pressing this
button for three seconds to exit it.

(8) “ ” button function

8

After power on the meter, press " " button once, the

backlight will be on, press this button again to turn off it. The
backlight will be automatically powered off in 30 seconds after
turning on the backlight.

8. Notes

(1) This meter has already been calibrated before delivery. Do
not revise the calibration parameters without professional
personnel and device. The recommended calibration period is
one year.
(2) Repairs or servicing not covered in this manual should only
be performed by qualified personnel.
(3) Wipe the unit with a dry soft cloth. Do not use abrasives or
solvents on this instrument.
(4) Remove the battery when the meter is to be stored for long
periods of time to avoid battery leakage.
(5) Replace new batteries when the low battery icon " "

appears.

9

9.Accessories

①User's manual
②9V battery

UK Distributor

ATP Instrumentation Ltd

Tournament Way

Ivanhoe Industrial Estate

Ashby-De-La-Zouch

Leicestershire

LE65 2UU

Tel: [phone] Sales 01530 566804 Technical

Fax: [phone]

www.atp-instrumentation.co.uk