Lutron Electronics GCH-2018 User manual

Carbon dioxide + Humidity, Temperature
CO METER
Mo
d
e
l
: GCH-2018
Your purchase of this CO2 METER marks a step forward for you
into the field of precision measurement. Although this CO2 is a
complex and delicate instrument, its durable structure developed.
Please read the following instructions carefully and always keep
this manual within easy reach.
OPERATION MANUAL

TABLE OF CONTENTS
1. FEATURES......................................................................
.
1
2. SPECIFICATIONS............................................................
.
1
3. FRONT PANEL DESCRIPTION........................................... 5
3-1 Display......................................................................5
3-2 Power Button............................................................
.
5
3-3 Hold Button ( Esc Button )..........................................5
3-4 REC Button ( Enter Button ).......................................
.
5
3-5 Set Button ( Button ).............................................▲5
3-6 Alarm/Dew point Button ( Button ).........................
.
▼5
3-7 Battery Compartment/Cover....................................... 5
3-8 Stand........................................................................5
3-9 Input socket..............................................................5
3-10 RS-232 Output Terminal...........................................5
3-11 DC 9V Power Adapter Input Socket........................... 5
3-12 Reset button...........................................................
.
5
3-13 CO2 Probe Head...................................................... 5
3-14 CO2 Probe Handle...................................................
.
5
3-15 CO2 Probe Plug.......................................................
.
5
3-16 Humidity Probe Head...............................................
.
5
3-17 Humidity Probe Handle.............................................5
3-18 Humidity Probe Plug.................................................5
4. MEASURING PROCEDURE................................................
.
7
4-1 CO2 measurement..................................................... 7
4-2 Humidity measurement.............................................. 7
a. Humidity/Temp. measurement.................................. 7
b. Dew point measurement..........................................
.
8
4-3 CO2 alarm setting......................................................8
4-4 Data Hold..................................................................8
4-5 Data Record ( Max, Min reading )...............................
.
9
5. ADVANCED SETTING....................................................... 9
5-1 Auto power off enable/disable....................................
.
10
5-2 Change the Temp , unit......................................℃℉ 11
5-3 CO2 alarm value setting.............................................11
5-4 CO2 altitude ( Height ) value setting........................... 12
6. RS232 PC SERIAL INTERFACE..........................................12
7. BATTERY REPLACEMENT.................................................
.
14
8. SYSTEM RESET...............................................................
.
14
9. ANNEX...........................................................................
.
15

1. FEATURES
*NDIR method principal for CO2 ( Carbon dioxide )
measurement, available for long term operation.
*High repeatability and high accuracy.
*Two probes, one is for CO2/Temp. measurement, the
other probe is for Humidity/Temp./Dew point
measurement.
*Separate probe, easy operation and convenient
for remote measurement.
*CO2 function with alarm setting.
*Can set the altitude ( height ) value with default for
compensation.
*Humidity measurement with fast response time.
*Large S-TN LCD, high contrast, easy readout.
*Data hold function for freezing the desired value
on display.
*Records Maximum and Minimum readings with Recall.
*RS232/USB computer interface.
*Microprocessor circuit assures maximum possible
accuracy, provides special functions and features.
*Heavy duty & compact housing with hard carrying case,
designed for easy carry out & operation.
*Auto shut off is available to save battery life.
*Power supply from batteries or DC 9V adapter in.
2. SPECIFICATIONS
2-1 General Specifications
Circuit Custom one-chip of microprocessor LSI
circuit.
Display LCD size : 52 mm x 38 mm
dual function LCD display.
Measurement CO2 ( Carbon dioxide ), Temp.
Humidity, Dew point, Temp.
1

Unit CO2 ppm
Humidity % RH
Dew point ,℃℉
Temp. ,℃℉
Response Time CO2 :
< 2 min. typically.
* Reach the 63% reading value
* Depend the environment air
circulation.
Humidity/Dew point :
10 to 30 seconds typically.
* Reach the 85% reading value
* Depend the environment air
circulation.
CO2 Altitude 0 to 9,000 meters.
( Height )
For precision measurement, it need to set the meter's
value setting environment altitude ( height ) value for the compensation.
Temperature Automatic temp. compensation.
Compensation
Advanced Auto power off enable/disable setting
setting / setting℃℉
CO2 alarm value setting
CO2 altitude value setting
Alarm setting For CO2 measurement only.
Data Hold Freeze the display reading.
Memory Recall Maximum & Minimum value.
Display Approx. 1 second.
Sampling Time
Power off Auto shut off saves battery life or
manual off by push button.
Data Output RS 232/USB PC serial interface.
*
Connect the optional RS232 cable
UPCB-02 will get the RS232 plug.
*
Connect the optional USB cable
USB-01 will get the USB plug.
2

Probes no. Two probes :
* Probe 1 is for CO2, Temp. measurement.
* Probe 2 is for Humidity, Dew point.
Temp. measurement.
Operating 0 to 50 .℃
Temperature
Operating Main instrument : Less than 85% R.H.
Humidity C02 probe : Less than 85% R.H.
Humidity probe : 0 to 95 %RH.
Power Supply DC 1.5 V battery ( UM3, AA ) x 6 PCs,
or equivalent.
Power Current CO2 measurement
Approx. DC 9.6 mA for 90% period.
Approx. DC 128 mA for 10% period.
Humidity measurement
Approx. DC 5.6 mA.
Weight Main instrument : 372 g/0.82 LB.
@ Battery is included.
CO2 probe : 158 g/0.35 LB.
Humidity probe : 82 g/0.18 LB.
Dimension Main instrument :
173 x 68 x 42 mm
(7.9 x 2.7x 1.2 inch)
CO2 Probe :
185 x 38 x 26 mm
Humidity Sensor Probe :
200 x 23 x 19 mm
Accessories Instruction manual.........................1 PC
Included CO2 probe.....................................1 PC
Humidity probe..............................1 PC
Hard Carryin
g
case........................
.
1 PC
Optional RS232 cable, UPCB-02
Accessories USB cable, USB-01
Data Acquisition software, SW-U801-WIN
3

2-2 Electrical Specifications (23±5 )℃
CO2 ( Carbon dioxide )
Range 0 to 4,000 ppm
CO2 Resolution 1 ppm
( Carbon Accuracy ± 40 ppm
dioxide )
* 1,000 ppm.≦
± 5% of reading
* > 1,000 ppm 3,000 ppm.≦
23 ± 5 .℃ ± 250 ppm typically
* > 3,000 ppm, reference only
Repeatability ± 20 ppm
* 3,000 ppm.≦
Range 0 to 50 ,32 to 122 .℃℃℉ ℉
Temperature Resolution 0.1 degree
Accuracy - 0.8 ,℃℃- 1.5 .℉℉
Humidity/ Temp./Dew point
Humidity/ Temperature
Range 10 % to 95 % R.H.
Humidity Resolution 0.1 % R.H.
Accuracy 70% RH :≧± (3% reading + 1% RH).
< 70% RH :
±3%RH.
Range 0 to 50 ,32 to 122 .℃℃℉ ℉
Temperature Resolution 0.1 degree
Accuracy - ± 0.8 , - ± 1.5 .℃℃℉℉
4

Dew Point
℃Range -25.3 to 48.9℃℃
Resolution 0.1 ℃
℉Range -13.5 to 120.1 .℉℉
Resolution 0.1 .℉
Remark : * Dew Point display value is calculated from the
Humidity/Temp. measurement automatically.
* The Dew Point accuracy is sum accuracy value of
Humidity & Temperature measurement..
@ Above specification tests under the environment RF Field Strength less than 3
V/M & frequency less than 30 MHz only.
3. FRONT PANEL DESCRIPTION
5

3-1 Display
3-2 Power Button
3-3 Hold Button ( Esc Button )
3-4 REC Button ( Enter Button )
3-5 Set Button ( Button )▲
3-6 Alarm/Dew point Button ( Button )▼
3-7 Battery Compartment/Cover
3-8 Stand
3-9 Input socket
3-10 RS-232 Output Terminal
3-11 DC 9V Power Adapter Input Socket
3-12 Reset button
3-13 CO2 Probe Head
3-14 CO2 Probe Handle
3-15 CO2 Probe Plug
3-16 Humidity Probe Head
3-17 Humidity Probe Handle
3-18 Humidity Probe Plug
6

4. MEASURING PROCEDURE
4-1 CO2 measurement
1)Plug the " CO2 Probe Plug " ( 3-15, Fig. 1 ) into the "
Probe Input Socket " ( 3-9, Fig. 1 ).
2)Power on the meter by pressing the " Power Button "
( 3-2, Fig. 1 ),
* The LCD will show the text " WARM UP "
*
The " Sampling indicator " will be rotated
in cycling.
Warm up time will take about 45 seconds, then
display will show the CO2 ( PPM ) value in the upper
LCD, the lower LCD will show the temperature value.
*
When the " Sampling indicator " rotate one cycle,
the CO2 measuring value will update one time.
* Response Time of CO2 is < 2 min. typically,
however it is depend on the environment air
circulation.
3)The meter Temp. display unit is defaulted to " ". If℃
intend to let the meter's temperature unit default to " "℉
, then please refer section 5-2 ( page 11 ).
4-2 Humidity measurement
a. Humidity/Temp. measurement
1)Plug the " Humidity Probe Plug " ( 3-18, Fig. 1 ) into the
" Probe Input Socket " ( 3-9, Fig. 1 ).
2)Power on the meter by pressing the " Power Button "
( 3-2, Fig. 1 ), the LCD shows the unit " %RH " & " "℃
at the same time and measured value will show on
the display ( upper display is Humidity value, the
lower display is the temperature value ) .
3)The meter Temp. display unit is defaulted to " ". If℃
intend to let the meter's temperature unit default to " "℉
, then please refer section 5-2 ( page 11 ).
7

b. Dew point measurement
The procedures of " Dew point measurement " are same
as the above " a. Humidity/Temp. measurement "
except press the " Dew point Button " ( 3-6, Fig. 1 ) once,
the lower LCD will show the indicator " DEW " & and the
Dew point value along the unit. " ( or ).℃℉
* The upper display will still show the humidity value
and not change.
* If press the " Dew point Button " ( 3-6, Fig. 1 ) once again,
the lower LCD will return the Temp. value.
4-3 CO2 alarm setting
During the CO2 measurement, if press the " Alarm
Button " ( 3-6, Fig. 1 ) once, the display will show the
indicator " ALARM " and going on to execute the CO2
alarm function. If the measurement value over the "
Alarm setting value ", the buzzer will sound.
* If press the " Alarm Button " ( 3-6, Fig. 1 ) once again,
the CO2 alarm function will be disabled, the ' ALARM "
indicator on the LCD will be disappeared.
* The procedures of setting the CO2 alarm value, please
refer section 5-3 ( page 11 ).
4-4 Data Hold
During the measurement, press the " Hold Button " ( 3-3,
Fig. 1 ) once will hold the measured value & the LCD will
display a " HOLD " symbol.
* Press the " Hold Button " once again will release the data
hold function.
8

4-5 Data Record ( Max., Min. reading )
* The data record function records the maximum and
minimum readings. Press the " REC Button " ( 3-4, Fig.
1 ) once to start the Data Record function and there
will be a " REC. " symbol on the display.
* With the " REC. " symbol on the display :
a)Press the " REC Button " ( 3-4, Fig. 1 ) once, the "
REC. MAX. " symbol along with the maximum value
will appear on the display.
If intend to delete the maximum value, just press
the " Hold Button " ( 3-3, Fig. 1 ) once, then the
display will show the " REC. " symbol only & execute
the memory function continuously.
b)Press the " REC Button " ( 3-4, Fig. 1 ) again, the
" REC. MIN. " symbol along with the minimum value
will appear on the display.
If intend to delete the minimum value, just press
the " Hold Button " ( 3-3, Fig. 1 ) once, then
the display will show the " REC. " symbol only &
execute the memory function continuously.
c)To exit the memory record function, just press the
" REC " button for 2 seconds at least. The display will
revert to the current reading.
5. ADVANCED SETTING
When execute the following Advanced
Setting Procedures should cancel the " Hold
function " and the " Record function " first. The
display will not show the " HOLD " and the " REC "
indicator
9

Press the " Set Button " ( 3-5, Fig. 1 ) continuously at
least two seconds will enter the " Advanced Setting ",
then press the " Set Button " ( 3-5, Fig. 1 ) once a
while in sequence to select the four main function, the
lower display will show :
PoFF.....Auto power ON/OFF management
t-CF......Change the Temp , unit℃℉
AL.........Setting the CO2 alarm value
ALt.......
.
Setting the meter altitude ( height ) value
5-1 Auto power ON/OFF
When the lower display show " PoFF " :
1)Press the " Enter Button " ( 3-4, Fig. 1 ) once, the upper
display will show " 0 ", use the " Button " ( 3-5, Fig.▲
1 ) or " Button " ( 3-6, Fig. 1 ) to select the upper▼
value to " 0 " or " 1 ".
0 - Auto Power Off management will disable.
1 - Auto Power Off management will enable..
2)After select the upper value to " 0" or " 1", press the
" Enter Button " ( 3-4, Fig. 1 ) will save the setting value
( function ) with default.
* If before press the " Enter Button ", just press
the " ESC Button " ( 3-3, Fig. 1 ) will escape the
Advanced Setting procedures without saving the
value ( function ) into the circuit memory.
10

5-2 Change the Temp , unit℃℉
When the lower display show " t-CF " :
1)Press the " Enter Button " ( 3-4, Fig. 1 ) once, the upper
display will show " 0 ", use the " Button " ( 3-5, Fig.▲
1 ) or " Button " ( 3-6, Fig. 1 ) to select the upper▼
value to " 0 " or " 1 ".
0 - The Temp. unit is .℃
1 - The Temp. unit is .℉
2)After select the upper value to " 0" or " 1", press the
" Enter Button " ( 3-4, Fig. 1 ) will save the setting Temp.
unit ( , ) with default.℃℉
* If before press the " Enter Button ", just press
the " ESC Button " ( 3-3, Fig. 1 ) will escape the
Advanced Setting procedures without saving the
value ( function ) into the circuit memory.
5-3 Setting the CO2 alarm value
When the lower display show " AL " :
1)Press the " Enter Button " ( 3-4, Fig. 1 ) once, the upper
display will show " CO2 alarm value " with PPM unit,
use the " Button " ( 3-5, Fig. 1 ) or " Button " ( 3-6,▲▼
Fig. 1 ) to select the " CO2 alarm value ".
2)After setting the CO2 alarm value, press the
" Enter Button " ( 3-4, Fig. 1 ) will save the setting value
with default.
* If before press the " Enter Button ", just press
the " ESC Button " ( 3-3, Fig. 1 ) will escape the
Advanced Setting procedures without saving the
alarm value into the circuit memory.
11

5-4 Setting the CO2 Altitude ( Height ) value
For precision measurement, it recommend to set the meter's
environment altitude ( height ) value for the compensation.
When the lower display show " ALt " :
1)Press the " Enter Button " ( 3-4, Fig. 1 ) once, the upper
display will show the setting " altitude ( Height ) value "
with meter unit. Use the " Button " ( 3-5, Fig. 1 ) or▲
" Button " ( 3-6, Fig. 1 ) to set the desired Altitude▼
value ( meters ).
2)After setting the altitude value, press the " Enter Button "
( 3-4, Fig. 1 ) will save the setting value with default.
* If before press the " Enter Button ", just press
the " ESC Button " ( 3-3, Fig. 1 ) will escape the
Advanced Setting procedures without saving the
alarm value into the circuit memory.
6. RS232 PC SERIAL INTERFACE
The instrument has RS232 PC serial interface via a 3.5
mm terminal ( 3-10, Fig. 1 ).
The data output is a 16 digit stream which can be
utilized for user's specific application.
A RS232 lead with the following connection will be
required to link the instrument with the PC serial port.
Meter PC
(3.5 mm jack plug) (9W 'D" Connector)
Center Pin........................Pin 4
Ground/shield.....................Pin 2 2.2 K
resister
Pin 5
12

The 16 digits data stream will be displayed in the
following format :
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Each digit indicates the following status :
D15 Start Word = 02
D14 4
D13 When send the upper display data = 1
When send the lower display data = 2
D12 & Annunciator for Display
D11 = 01℃PPM = 19 % RH = 04
= 02℉
D10 Polarity
0 = Positive 1 = Negative
D9 Decimal Point(DP), position from right to the
left
0 = No DP, 1= 1 DP, 2 = 2 DP, 3 = 3 DP
D8 to D1 Display reading, D8 = MSD, D1 = LSD
For example :
If the display reading is 1234, then D8 to
D1 is : 00001234
D0 End Word = 0D
RS232 setting
Baud rate 9600
Parity No parity
Data bit no. 8 Data bits
Stop bit 1 Stop bit
13

7. BATTERY REPLACEMENT
1)When the left corner of LCD display show " ", it
is necessary to replace the battery. However, in-spec.
measurement may still be made for several hours after
low battery indicator appears before the instrument
become inaccurate.
2)Slide the " Battery Cover " ( 3-7, Fig. 1 ) away from the
instrument and remove the battery.
3)Replace with DC 1.5 V battery ( UM3, AA,
Alkaline/heavy duty ) x 6 PCs, and reinstate the cover.
4)Make sure the battery cover is secured after changing
the battery.
8. SYSTEM RESET
If the meter happen the troubles such as :
CPU system is hold ( for example, the key button can
not be operated... ).
Then make the system RESET will fix the problem.
The system RESET procedures will be either following
method :
During the power on, use a pin to press the " Reset
Button " ( 3-12, Fig. 1 ) once a while will rest the
circuit system, After execute the " System reset " the
setting value of : Advanced Setting " will be cleared
and return to default value.
14

9. ANNEX
The follow CO2 value are for the requirement
for different environment, however it is for
reference only.
Building, office, home ≦1,000 PPM
School ≦1,500 PPM
Hotel, public area ≦1,500 PPM
Indoor swimming pool ≦1,500 PPM
ASHRAE ≦1,000 PPM
WHO ≦920 PPM
15 0903-GCH2018-UM3