TENMARS ST-502 User guide

ST-502

Desktop Indoor Air Quality (IAQ)

Monitor User’s Manual

HB2ST5020001

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

ammeter and its components.

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

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

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.

 Indoorair quality monitoring.

5.2 CO2Concentration and Guidelines

 Asindicated 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

 Pressthe 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

 Pressthe 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

 Pressthe buttonto enter this item

setting operation.

 Pressthe button or button to

select between 12/24.

 Pressthe buttonto exit this item setting

operation.

Step 2. Clock setting

 Pressthe buttonto enter this item

setting operation.

6

 Thehour digit will start flashing; press the

button to increase and press the

button to decrease.

 Pressthe button and the minute digit will

start flashing; press the button to
increase and press the button to

decrease.

 Pressthe button and the month digit will

start flashing; press the button to
increase and press the button to

decrease.

 Pressthe button and the year digit will

start flashing; press the button to
increase and press the button to

decrease.

 Pressthe button again to start setting

from the first digit again.

 Pressthe buttonto exit this item setting

operation.

Step 3.Alarm switch

 Pressthe buttonto enter this item

setting operation.

 Pressthe or button to select

on/off.

 Pressthe buttonto exit this item setting

operation.

7

Step 4.CO2 alarm maximum value

 Pressthe buttonto enter this setting

item operation.

 Thefirst digit will start flashing at this time;

press the button to increase and press
the buttonto decrease.

 Pressthe button and the second digit

will start flashing; press the button to
increase and press the button to

decrease.

 Pressthe button and the third digit will

start flashing; press the button to
increase and press the button to

decrease.

 Pressthe button and the fourth digit will

start flashing; press the button to
increase and press the button to

decrease.

 Pressthe button again to start setting

from the first digit again.

 Pressthe buttonto 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 buttonto 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 buttonto 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:

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

(NDIR)

Range

±75ppm.(0

-

2000ppm)

Time

2 minutes

Sensor Type

Thermistor

Range

Accuracy

±1.0°C/±1.8°F

Resolution

0.1°C/0.1°F

Time

Sensor Type

Capacitive

Range

±5.0%RH(<20%,>80%)

at 25

°C

Resolution

0.1%

Time

Accurate ambient temperature range: 18℃ (64℉) ~ 28℃

(82℉)

 Carbon dioxide

Sensor Type Non-Dispersive InfraRed

Measurement

Accuracy ±5% read value or

Resolution ±1ppm

Response

 Temperature

Measurement

Response

 Relative Humidity

Measurement

Accuracy ±3.0%RH(20~80%); at 25°C

Response

0 to 9999ppm

Reaches 90% in approximately

0°C~50°C / 32°F~122°F

Approximately 1 second

5-95%

Approximately 4 seconds

15

9 Maintenance

1. Pleaseread the user’s manual carefully to
check whether there are any operating errors.

2. Donot 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.

TENMARS ELECTRONICS CO., LTD.

6F, NO.586 Ruiguang Rd, Neihu Dist.

Taipei City, Taiwan

E-mail: [email protected]

http://www.tenmars.com