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