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.

7
Step 4.CO2 alarm maximum value
Press the button to enter this setting
item operation.
The first digit will start flashing at this time;
press the button to increase and press
the button to decrease.
Press the button and the second digit
will start flashing; press the button to
increase and press the button to
decrease.
Press the button and the third digit will
start flashing; press the button to
increase and press the button to
decrease.
Press the button and the fourth 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.

8
Step 5. CO2 alarm minimum value
Press the button to enter this setting
item operation.
The first digit will start flashing at this time;
press the button to increase and press
the button to decrease.
Press the button and the second digit
will start flashing; press the button to
increase and press the button to
decrease.
Press the button and the third digit will
start flashing; press the button to
increase and press the button to
decrease.
Press the button and the fourth 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.

9
Step 6. Outdoor CO2
Press the button to enter this setting
item operation.
The first digit will start flashing at this time;
press the button to increase and press
the button to decrease.
Press the button and the second digit
will start flashing; press the button to
increase and press the button to
decrease.
Press the button and the third digit will
start flashing; press the button to
increase and press the button to
decrease.
Press the button and the fourth 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.

10
Step 7.ABC Auto-correct function
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.
Once the ABC function is turned on, it uses
400ppm as the standard and will have
adjusted approximately 30ppm over an
accumulated time of 180 hours; therefore it is
recommended to place it at a well-ventilated
place once the function is enabled.
5.7 Ventilation Formula
CFM/P(inch/minute/person)
CFM/P = 10600/(Cs-Co)
Cs = CO2read value, Co = CO2outdoor read
value.
L/P/S(liter/second/person)
L/P/S=(CFM/P)*28.32/60

11
6 Software Installation
Supported operating systems:
XP/Windosw7/Windows 8.1/Windows10
First place the CD included with this meter into the
CD/DVD ROM of the PC to install the desktop
program:
Once the desktop program installation is complete,
remove the CD from the CD/DVD ROM drive.
Connect this meter to the PC using the USB cable
included, as shown in the figure below:
USB CABLE
Good Normal Poor
Mode Enter
REC
ST-502

12
Execute the PC desktop software program:
double-click the left mouse button on the desktop
program (Indoor Air Quality Data Logger.exe) to
execute the desktop program.

13
7 General Specifications
Read value display: Triple-display LCD
monitor
Display unit: ℃/℉, PPM, %RH
Maximum value/Minimum value
Alarm function
Memory can store a maximum of 17,000 data
entries.
Record time interval:
5 seconds/10 seconds/1 minute/5 minutes
/10 minutes/30 minutes/1 hour/2 hours
Operating power consumption: 2.4W
Operating temperature and humidity: 0℃to
50°C (32-122°F), relative humidity 5-95% RH
(non-condensing)
Storage temperature and humidity: -10℃to
60℃(14-140℉) , relative humidity under 70%
Weight: Approximately 190 grams
Dimensions: 89 x 62 x 128 mm (L x W x H)

14
8 Electrical Specifications
Accurate ambient temperature range: 18℃(64℉) ~ 28℃
(82℉)
Carbon dioxide
Sensor Type Non-Dispersive InfraRed
(NDIR)
Measurement
Range 0 to 9999ppm
Accuracy ±5% read value or
±75ppm.(0-2000ppm)
Resolution ±1ppm
Response
Time Reaches 90% in approximately 2 minutes
Temperature
Sensor Type Thermistor
Measurement
Range 0°C~50°C / 32°F~122°F
Accuracy ±1.0°C/±1.8°F
Resolution 0.1°C/0.1°F
Response
Time Approximately 1 second
Relative Humidity
Sensor Type Capacitive
Measurement
Range 5-95%
Accuracy ±3.0%RH(20~80%);
±5.0%RH(<20%,>80%)
Resolution 0.1%
Response
Time Approximately 4 seconds

15
9 Maintenance
1. Please read the user’s manual carefully to
check whether there are any operating errors.
2. Do not place the ammeter in locations that has
high temperature, humidity or that are exposed
to direct sunlight.
10 Cleaning
Please turn off the power first before cleaning; use a
soft and dry cloth to wipe it clean. Do not wipe it with
wet cloth, liquids or water etc.
11 End of Life Disposal
Note: This symbol indicates that the
ammeter and accessories must be
separated and processed properly.