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