| SKC Catalog Number: | 210-2, 210-5, 224-4, 224-P, 224-5, 100-3 |
| Category: | Sample Pumps |
| Sub-category: | Sample Pumps |
| Question: | How do SKC Sample Pumps compensate flow? |
| Answer: | Universal XR and AirChek 50 Series Pumps use a predictive flow control. Voltage applied to the pump motor and the current flowing through the motor windings are both sampled and controlled by the analogue driving circuit. The circuit is calibrated so that flow compensation within +/- 5% accuracy is achieved over the full range of flow and back pressure.
Leland Legacy, AirChek 2000, and AirChek XR5000 Pumps contain an isothermal flow sensor (U.S. Patent No. 5,892,160). It is a closed loop flow compensation system that directly measures airflow rather than having to rely on the predictive system. Airflow is being measured by monitoring pressure drop across the measurement tube installed in the pump's exhaust. The microprocessor continuously monitors and compares the pressure sensor output to the required flow reference and circuitry alters power applied to the motor if flow adjustment is needed. In addition, Leland Legacy and AirChek 2000 pumps both monitor temperature and atmospheric pressure so that the pump will compensate for changes in these parameters. |
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| SKC Catalog Number: | 210-2002 |
| Category: | Sample Pumps |
| Sub-category: | Sample Pumps |
| Question: | Can the temperature and atmospheric pressure display be calibrated and adjusted? |
| Answer: | It is possible to change the temperature and barometric pressure display in the AirChek 2000 pump. Using DataTrac 2000 with a live pump attached to the serial port of a PC, enter the Tools menu in the Pump Manager and select Temperature and Barometric Calibration. A Temperature and Barometric Pressure screen will display. Click on that screen to display the next screen. Click the up or down arrows to increase or decrease the temperature and pressure. CAUTION: Changing these settings may alter the sensor calibration. |
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| SKC Catalog Number: | 210-2002 |
| Category: | Sample Pumps |
| Sub-category: | Sample Pumps |
| Question: | There is an F-21 code displayed on the LCD of my AirChek 2000 sample pump. What does it mean? |
| Answer: | When an AirChek 2000 pump displays an F- code on its LCD, it is referring to a control board fault. Following are the possible F- codes, their definition, and remedies:
F-11, F-14, or F-21 NVRAM failed. Reset pump at user interface. Enter user interface. When CLr appears, press pump kepad up arrow 9 times. If problem recurs, send control board to SKC for repair.
F-31 or F-32 Atmospheric pressure sensor failed. Replace control board and top plate as a matched set (Cat. No. P79519) or send pump to SKC for repair.
F-33 or F-34 Temperature sensor failed. Check control board and temperature sensor connections and/or replace control board and top plate as a matched set (Cat. No. P79519). |
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