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Lutron Electronics GCH-2018, Operation Manual

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Lutron Electronics GCH-2018 Operation Manual Download Page 15

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

Summary of Contents for GCH-2018

Page 1: ...is 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 ...

Page 2: ...O2 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 disab...

Page 3: ... 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...

Page 4: ... 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 of...

Page 5: ...rox 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 Humid...

Page 6: ...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 ...

Page 7: ...isplay 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 ...

Page 8: ...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 ...

Page 9: ...O2 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 Butto...

Page 10: ... 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 val...

Page 11: ...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 b...

Page 12: ... 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 ...

Page 13: ... 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 B...

Page 14: ...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...

Page 15: ...ata 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...

Page 16: ...aline 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 Butt...

Page 17: ...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 ...

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