Sper scientific 850025 User manual

Mini Environmental
Quality Meter
850025

2
Mini Environmental Quality Meter 850025
Copyright ©2012 by
Sper Scientic
ALL RIGHTS RESERVED
Printed in the USA
The contents of this manual may not be reproduced
or transmitted in any form or by any means electronic,
mechanical, or other means that do not yet exist or may
be developed, including photocopying, recording, or
any information storage and retrieval system without the
express permission from Sper Scientic.
INTRODUCTION
For environmental testing anywhere. 850025 combines
an anemometer, humidity meter and thermometer into a
single compact unit. Features include touch-tone buttons,
min/max and hold functions. Comes ready to use with wrist
strap, instructions, battery and soft carrying case.
MATERIALS SUPPLIED
Meter
Wristlet
CR 2032 DC 3V Battery
Soft Carrying Case

3
TABLE OF CONTENTS
1. INTRODUCTION . . . . . . . . . . . . . . . . . 2
2. MATERIALS SUPPLIED. . . . . . . . . . . . . . 2
3. FEATURES . . . . . . . . . . . . . . . . . . . . 4
4. FRONT PANEL DESCRIPTION . . . . . . . . . . 5
5. OPERATING INSTRUCTIONS . . . . . . . . . . 6
Power on/off . . . . . . . . . . . . . . . . . . . . 6
LCD backlight on/off. . . . . . . . . . . . . . . . 6
Mode selection . . . . . . . . . . . . . . . . . . 6
Unit selection . . . . . . . . . . . . . . . . . . . 7
Special attention for the
Humidity measurement . . . . . . . . . . . . . . 7
Hold Function . . . . . . . . . . . . . . . . . . . 8
REC (Record) function . . . . . . . . . . . . . . 8
Auto power off disable. . . . . . . . . . . . . . . 9
6. BATTERY REPLACEMENT . . . . . . . . . . . . 9
7. SPECIFICATIONS. . . . . . . . . . . . . . . . . 10
8. WARRANTY . . . . . . . . . . . . . . . . . . . . 12

4
FEATURES
• 3 professional environmental instruments in
1: Air velocity, Humidity and Temperature
• Lightweight, ergonomic design
• Wristlet design provides extra protection to
the instrument
• Low-friction ball bearing mounted impeller design
provides high accuracy at high and low air velocity
• High precision humidity sensor with fast response time
• Built-in microprocessor circuit assures excellent
performance and accuracy
• Concise and compact buttons arrangement for
easy operation.
• Maximum and minimum memory with recall
• Hold function
• °C/°F selection

5
FRONT PANEL DESCRIPTION
3. FRONT PANEL DESCRIPTION
Fig. 1
3-1 Hold button
3-2 Button ( Power button )
3-3 REC nutton
3-4 LCD display
3-5 Wristlet
3-6 Anemometer Vane
3-7 Humdity/Temp. sensor
3-8 Battery Compartment / Cover
3-9 Buttons operation label
3-10 Anemometer Temp. sensor
3
6
4
1
7
2
3
10
9
8
5
1 Hold button
2 Button (Power button)
3 REC button
4 LCD display
5 Wristlet
6 Anemometer vane
7 Humidity/Temperature sensor
8 Battery compartment cover
9 Buttons operation label
10 Anemometer temperature sensor

6
OPERATING INSTRUCTIONS
Power on/off
Button = Power Button
1. Power on: Press once to turn meter on.
2. Power off: Press for > 3 seconds to turn meter off.
LCD backlight on/off
With the meter on, press once. The LCD backlight will
light for 5 seconds, then shut off automatically.
Mode selection
This meter offers 2 selectable modes:
a. Anemometer (Air velocity)/Temperature
b. Humidity/Temperature
With the meter on, press HOLD continuously and the
Display will show the following texts in sequence:
Display Mode text
An = Anemometer (Air velocity)/Temperature
rH = Humidity/ Temperature
When the display shows the desired mode, release
HOLD and the meter will set this mode as the default.

7
An Mode Selection
REC button = Enter button
1. With the power on, press REC for >3 seconds, the
display will show Unit. Release REC, then press to
scroll through the available scales. After the desired
scale is selected, press REC to save as the default.
2. The next screen displays “dCdF” with the current
temperature scale selection (°C or °F) below.
Press to select the desired scale. Press REC
to save as the default.
Note…
When rH is the selected mode, you may only adjust
the temperature scale setting. (°C or °F)
The selection scales for all modes are:
Measurement Scales
Air Velocity m/s, Km/h, mph, knot, FPM
Temp. (Air velocity) °C/°F
Temp. (Humidity) °C/°F
Note…
For the most accurate humidity measurement, do not
touch or block the humidity sensor at any time with
your hand.

8
Hold Function
Pressing Hold will freeze the current reading on the
display. The HOLD symbol will be displayed at the top
of the display window.
To release the Hold function, press Hold again, the
HOLD indicator will disappear and the current reading
will be displayed.
REC (Record) function
The REC (Record) function will record and display
the maximum and minimum readings.
1. Start the Record function by pressing REC once.
The REC symbol will appear on the display.
2. With the REC symbol on the display:
a. Press REC once and the Max symbol will appear on
the display along with the current maximum value.
b. Press REC again, the MIN symbol will appear on
the display along with the current minimum value.
c. Clear the recorded MAX or MIN value from the
display by pressing Hold once. The MAX/MIN
symbols and their readings, will disappear from the
display. The meter will return to the REC function
and continue recording.
d. To exit REC function press REC button for >2 sec.

9
Auto power off disable
In order to prolong the battery life, this instrument has an
Auto Power Off function: the meter will turn off if no buttons
are pressed for approximately 10 minutes.
To disable the Auto Power Off function, press REC and
enter the record function (page 8). The Auto power off
function will be disabled until the record function is exited.
REPLACE BATTERY
1. When the LCD display shows symbol, it is time
to replace the battery. (Measurements may still be
made for several hours after the low battery
indicator appears.)
2. Open the Battery Compartment and remove
the battery.
3. Install the battery (CR2032) and replace the cover.

10
GENERAL SPECIFICATIONS
Display 8 mm LCD display
Measurement 1. Anemometer (Air velocity)
/Temperature
2. Humidity/Temperature
Operating Humidity Max. 80% RH
Operating Temp 0 ~ 50°C (32 ~ 122°F)
Over Input Display “- - - -”
Power Supply CR 2032 DC 3V battery
Power Consumption Approx. DC 5 mA
Weight 160 g (battery included)
Dim (HWD) 4.7" x 1.8" x 1.2" (120 x 45 x 20 mm)
Standard Accessories Instruction Manual, battery,
soft case