Tenmars ST-502 User manual

Medidor portatil temperatura y humedad, CO2 tipo , USB
TN-ST502

ST-502
Desktop Indoor Air Quality (IAQ)
Monitor User’s Manual
Good Normal Poor
Mode Enter
REC
ST-502
HB2ST5020000

CONTENTS
1Introduction................................................................1
2Accessories...............................................................1
3Safety Precaution.....................................................1
4Meter Description .....................................................2
5Operation...................................................................3
5.1Applications.......................................................3
5.2CO2Concentration and Guidelines...............3
5.3Checking Measurement Modes.....................4
5.4Record Function ...............................................4
5.5Reset Settings...................................................4
5.6Function Setting................................................5
5.7Ventilation Formula........................................10
6Software Installation...............................................11
7General Specifications...........................................13
8Electrical Specifications.........................................14
9Maintenance............................................................15
10Cleaning...................................................................15
11End of Life Disposal...............................................15

1
1 Introduction
ST-502 is a desktop indoor air quality monitor that
can measure carbon dioxide, relative humidity, air
temperature, and ventilation rate.
2 Accessories
1 ST-502 Ammeter
1 User’s Manual
1 AC100~240V
12V/1A (5.5*2.1*1.0mm) switching
transformer
1 5-pin USB cable
3 Safety Precaution
Note! Please refer to this manual.
Improper usage may damage the
ammeter and its components.
Complies with European Directive
Do not operate in environments with flammable
gas or humid environments.
Operating altitude: 2000 meters below sea level.
Operating environment: Indoor use; contamination
level class 2.
Cleans wide with soft cloth when dirty, such as
glasses cloth. Do not clean with chemical and
other solvents.
EMC: EN61326-1:CISPR 11:Group 1, Class A
Class A –Equipment for use in all establishments
other than domestic
Group 1 –RF energy generated is needed for
internal functioning

2
4 Meter Description
10
11
9
ST-502
6345
7
8
1
2
1. LCD Monitor
2. Mode/Left button
3. Datalogger button
4. Enter button
5. Right button
6. CO2concentration indicator; good
7. CO2concentration indicator; normal
8. CO2concentration indicator; poor
9. Setting reset button
10. USB jack
11. External power input jack

3
5 Operation
5.1 Applications
Building air conditioning system (HVAC)
monitoring.
Indoor air quality monitoring.
5.2 CO2Concentration and Guidelines
As indicated according to ASHRAE standard
62.1-2013 Appendix B Summery of Selected
Air Quality Guidelines, carbon dioxide may
cause risks to body health when the under very
high concentrations (for example greater than
5,000PPM).
NIOSH recommendations:
250-350ppm – Concentration of normal outdoor
environment
600ppm – Minimum requirement for good air
quality.
600-1000ppm – CO2 concentration slightly high
1000ppm – Insufficient ventilation
These standards are guideline references only; if
the CO2 content exceeds 1,000ppm, it does not
necessarily mean that the building is dangerous and
needs to be evacuated. This standard is used as a
guideline to help increase the level of comfort to a
maximum.

4
5.3 Checking Measurement Modes
Press the button to view the following
screens in this order:
 
 
L/P/S ventilationCFM/P ventilation
minimum valuemaximum valuesave
effective percentage℃.
5.4 Record Function
Press the button until “REC” appears on
the LCD (2 seconds) to enter the automatic
recording function. The currently measured
value, setting function and USB connection can
be displayed during the recording process.
Press the “REC” button again until “REC” on
the LCD disappears (2 seconds) to exit the
automatic recording function.
5.5 Reset Settings
Before powering on, press and hold the
“RESET” button and then turn on the power to
restore all settings to the factory default values.

5
5.6 Function Setting
Press and hold +buttons
simultaneously for 2 seconds to enter the
function setting mode;
use the or buttons to select the
content to set and then press to enter
and set that item.
Press and hold +buttons
simultaneously for 2 seconds to exit the
function setting mode.
Step 1. 12/24 hour mode
Press the button to enter this item
setting operation.
Press the button or button to
select between 12/24.
Press the button to exit this item setting
operation.
Step 2. Clock setting
Press the button to enter this item
setting operation.

6
The hour digit will start flashing; press the
button to increase and press the
button to decrease.
Press the button and the minute digit will
start flashing; press the button to
increase and press the button to
decrease.
Press the button and the month digit will
start flashing; press the button to
increase and press the button to
decrease.
Press the button and the year digit will
start flashing; press the button to
increase and press the button to
decrease.
Press the button again to start setting
from the first digit again.
Press the button to exit this item setting
operation.
Step 3.Alarm switch
Press the button to enter this item
setting operation.
Press the or button to select
on/off.
Press the button to exit this item setting
operation.