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GFC-7000E Series
What is the acceptable purge flow rate for the GFC-7000E unit? The acceptable flow rate is between 200 cc / minute up to 1000 cc/ minute. If at 30psi the flow rate is 200cc or less, the internal restrictor in the purge line in the unit may be clogged with debris or particles. Top of page What is the standard purge pressure? Maximum? Minimum? The purge pressure internal to the analyzer is normally set at about 7.5 psig manually with the purge pressure regulator. Externally this line should be supplied with 1000 cc/min (± 20%) at 30 psig (± 25%). The upper limit of the purge gas pressure alarm is 12.5 psig; the lower limit is set to 2.5 psig. Top of page What material can be used to scrub CO2 from N2 gas? Soda lime powder. Top of page Why is the sample flow parameter not illuminated on the screen? How can we monitor the sample flow? The GFC7000 does not have a flow reading on the front panel. The flow control must be provided external to the analyzer as this analyzer is designed for a flow to be pushed through rather then pulled through it. In order to monitor the flow you will need some sort of external flow meter, preferably after the analyzer. Top of page Can you provide information on pressure and flow rate variation? This instrument is designed to be operated at an inlet pressure slightly over atmospheric pressure. (These are "blow through" cells.) 
Top of page What is the lifespan of the IR source? Two to three years. Top of page What gas is best used for purging with this instrument? Nitrogen or air is fine. It just can't have any CO2 in it and should be dry -- less than 0 DegC dew point. Top of page How do I perform a manual DAC calibration on "E" series machines? Please follow the appropriate procedure below for either VOLTAGE or CURRENT output. VOLTAGE OUTPUT 1. From the main menu press SETUP-MORE-DIAG-ENTR-NEXT until ANALOG I/O CONFIGURATION press ENTR. 2. Press SET> 5 times. 3. The top line should read A/IN CALIBRATED: YES 4. Press CAL to calibrate the analog inputs. 5. Press < SET 4 times. 6. The top line should read CONC_OUT_1: RANGE 5V a. If this is the output voltage you desire then go to step 7 b. If this voltage is incorrect press EDIT and change to the output voltage desired, press ENTR and go to step 7. 7. Press EDIT, Press SET>. The top line should read CONC_OUT_1: REC OFFSET: 0mv a. If you don’t want a recorder offset go to step 8. b. If you want a recorder offset press EDIT. Enter the OFFSET value and press ENTR. Go to step 8. 8. Press SET>. The top line should read CONC_OUT_1: AUTO CAL: ON a. If this says AUTO CAL ON press EDIT and turn it OFF. b. If this says AUTO CALL OFF go to step 9. 9. Press SET>. The top line should read CONC_OUT_1: CALIBRATED: YES 10. Now place your meter on pins 1 and 2 on the rear panel analog output connector and set your meter to read mvDC. 11. Press CAL on the front panel. 12. You should have some DN and UP buttons. And the top line should be say ZERO ADJUST or something similar. 13. The output on the meter should be as close as possible to 0mV ±0.3mV. a. If it is not then press DN or UP until the meter reads as close as possible to 0mv b. If it does go to step 14 14. Press ENTR. 15. The top line should now say GAIN ADJUST and you should have DN and UP buttons again. The meter should now read your full-scale voltage (i.e. 1V, 5V, 10V) you will have to change the range on the meter to read Volts instead of Mili-volts. 16. Press the DN and UP buttons until the output on the meter reads your full-scale voltage ±1mV. 17. Press ENTR 18. That channel is now calibrated. 19. Do this for all channels and ensure that you move the meter on the output connector to the proper pins. CURRENT OUTPUT 1. From the main menu press SETUP-MORE-DIAG-ENTR-NEXT until ANALOG I/O CONFIGURATION press ENTR. 2. Press SET> 5 times. 3. The top line should read A/IN CALIBRATED: YES 4. Press CAL to calibrate the analog inputs. 5. Press < SET 4 times. 6. The top line should read CONC_OUT_1: CURRENT a. If you desire Current output then go to step 7 b. If you do not desire Current output press EDIT and change to the output voltage desired, press ENTR and follow the steps in the Voltage Output procedure. 7. Press EDIT, Press SET>. The top line should read CONC_OUT_1: AUTO CAL: ON a. If this says AUTO CAL ON press EDIT and turn it OFF. b. If this says AUTO CALL OFF go to step 8. 8. Press SET>. The top line should read CONC_OUT_1: CALIBRATED: YES 9. Now place your meter on pins 1 and 2 on the rear panel analog output connector and set your meter to read mA. 10. Press CAL on the front panel. 11. You should have some DN and UP buttons. And the top line should be say ZERO ADJUST or something similar. 12. The output on the meter should be as close as possible to 0ma ±0.01ma (if 0-20ma output), 4ma ±0.01ma (if 4-20ma output). a. If not then press DN or UP until the meter reads as close as possible to 0ma or 4ma. b. If it does go to step 13 13. Press ENTR. 14. The top line should now say GAIN ADJUST and you should have DN and UP buttons again. The meter should now read your full-scale current output 20ma. 15. If it doesn’t press the DN and UP buttons until the output on the meter reads your full-scale current output of 20ma ±0.01ma. 16. Press ENTR 17. That channel is now calibrated. 18. Do this for all remaining channels that contain the Current option and ensure that you move the meter on the output connector to the proper pins for that channel. Top of page What is the temperature coefficient of the GFC-7001? The temperature coefficient is typically less than 5 ppb/deg C. Top of page How can I download code to the GFC7000? Please see the attached document: 02_039E_Downloading_New_Firmware_into_E_Series_Analyzers.doc Top of page Do you have a startup guide for the GFC7000E? Please see the attached document: GFC_7000E_Startup_Guide.doc Top of page What are the specs of the optional CO2 scrubber? Can the scrubber be used to pull CO2 out of air used for purging? The scrubber should last for about 1 year with less then 1ppm of CO2 in the stream. This puts the scrubber around 8000ppm/hours. Please keep in mind that this is just an approximation and your results may vary. For the purge air it is recommended to use N2 gas. If you use air with the CO2 scrubber it will die very shortly, within days as the amount of CO2 in the air is close to 400ppm. We do not recommend using this scrubber to scrub ambient air for the purge of the analyzer. I recommend that you use N2. DO NOT USE AIR TO PURGE THE UNIT UNDER ANY CIRCUMSTANCES. Top of page For the the gfc7000E analyzer what is the rejection ratio of the purge gas co2 level on the reading? Meaning if the purge starts out at zero ppb CO2 and the instrument is also zeroed on purge N2, and then the purge gas increases in CO2 content to some level, say Xppm, then what is the reading of the unit as related to X? As i recall there is a relationship of purge gas-driven error on reading of unit equals X times Y where Y is a rejection coefficient. The variation that you will see with an unpurged housing is simply the ratio of the unpurged length to the total length multiplied by the variation in CO2. In this case the un purged length is about 2.5 cm, the total path length is 1503 cm, yielding a rejection ratio of about 600:1. If there is a 300 ppm variation in the ambient CO2, something that is likely due to variations in human habitation, and photosynthesis, you'll see a variation of about 0.5 ppm. If this is acceptable then it should work. Top of page What is the maximum pressure that can be directly applied to the sample inlet and purge inlet of the analyzer? Meaning if the purge starts out at zero ppb CO2 and the instrument is also zeroed on purge N2, and then the purge gas increases in CO2 content to some level, say Xppm, then what is the reading of the unit as related to X? As i recall there is a relationship of purge gas-driven error on reading of unit equals X times Y where Y is a rejection coefficient. 15 psi. However, this is not a working pressure. The purge and sample inlets are blow through, i.e. no restriction to vent, so the working inlet and purge pressures are under 1psi, just enough to establish flow through the unit. Top of page What is the maximum inlet pressure permissible on the inlet port of these units? The manual only quotes 800cc/min flow. We do not have a max rating for pressure for safety reasons. We only let the customers know the below in our manuals. The maximum pressure of any gas at the sample inlet should not exceed 1.5in-HG above ambient pressure and ideally should equal ambient atmospheric pressure. Top of page Could you please provide me the TAPI spec for Lower Detectable Limit of this unit per the range below? 1. GFC7000E 0-5 ppm CO2 in Air The Lower Detectable Limit is < 5ppb Top of page Is there a warning or indication in the event of a loss of purge gas pressure? There is no warning, but a loss may provide a reading error. Top of page When the fault light LED is active, does the CO2 reading hold the last value with no error? No, the reading continues to be active. Some errors may not affect the reading, such as those involving the display, analog outputs, or potentially the sample flow. Top of page Is it possible to defeat the purge pressure warning? If the warning level is set to 0 psi for PURGE_PRESS_SET (LO) in VARS, that effectively turns off the warning. There is no other way to eliminate or disable the purge features. Top of page How is a “Bench Temp Failure” to be fixed? Record all front panel TST values and take note of the temperature value. Feel the top of the bench and see if it corresponds to the temperature. For example if it reads approximately 25°C, the unit should be cool to the touch and if it reads approximately 60°C, it will be hot. If cool, navigate to the Signal I/O menu located in the DIAG menu and find where the heater can be manually controlled. Measure the 120 VAC voltage going to the heater and verify if it is being cycled when the heater is being turned on/off. If the voltage properly cycles but the bench doesn't get hot, the problem is likely the strip heater. If the 120V doesn't cycle on and off, the problem is likely the relay board. Top of page What is the response time with a flow rate of 1 SLPM? Response time is < 60 seconds to 95% of reading change. Top of page |
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