Frequently Asked Questions



Why do Vaisala RAINCAP® measurements differ from tipping bucket measurements?	(HTML 2 KB)
Can I calibrate my dewpoint instrument using certified bottled gas?	(HTML 0.8 KB)
What does the water activity (aw) output from the moisture in oil instruments indicate?	(HTML 1 KB)
What is the maximum flow rate the moisture in oil sensor can withstand?	(HTML 0.5 KB)
What is the response time of the moisture in oil sensor?	(HTML 0.9 KB)
Where is the best place to install a Vaisala moisture in oil probe?	(HTML 0.6 KB)
Can the Vaisala moisture in oil sensor measure % water by volume in oil (free or emulsified water)?	(HTML 0.4 KB)
Does the moisture in oil sensor need to be programmed or calibrated for each specific oil or fluid?	(HTML 0.8 KB)
In which fluids can the moisture in oil sensor be used?	(HTML 0.7 KB)
What are the benefits of the HUMICAP® 180R?	(HTML 0.6 KB)
When is the sensor preheating option on the HM70 probes needed?	(HTML 0.8 KB)
Do Vaisala ultrasonic wind and weather transmitters offer 4 to 20 mA outputs?	(HTML 0.8 KB)
Can the GMP220 carbon dioxide probes be used in high humidity applications?	(HTML 0.5 KB)
Can I replace the GMP222 CO2 probe for ppm measurement with a GMP221 CO2 probe for percent measurement, or vice versa?	(HTML 0.3 KB)
What does the term "elevated dewpoint" mean?	(HTML 0.9 KB)
How are the individual parameters of the WXT510 calibrated?	(HTML 2 KB)
How can the WS425 be protected from lightning?	(HTML 1 KB)
What is the purpose of the chemical purge option on the HUMICAP® sensor?	(HTML 1 KB)
Can Vaisala barometric pressure products be used in applications other than meteorological observation?	(HTML 0.9 KB)
Why does Nafion® membrane tubing turn brown over time?	(HTML 2 KB)
How long can the GMP343 be powered by the MI70?	(HTML 0.2 KB)
How can temperature and pressure errors be corrected when using Vaisala CO2 products	(HTML 1 KB)
What is the relationship between elevation and barometric pressure?	(HTML 0.3 KB)
Why is there an option for more than one pressure transducer in the PTB330 and PTU300?	(HTML 0.9 KB)
What are the differences between the WS425A/B and WS425F/G?	(HTML 1 KB)
How often do Vaisala humidity products need to be calibrated?	(HTML 0.6 KB)
Does heavy rainfall, snow or hail affect ultrasonic wind measurement?	(HTML 1 KB)
What are the MTBF (mean time between failure) and MTTR (mean time to repair) values for the WS425 ultrasonic wind sensor?	(HTML 0.3 KB)
How do I measure barometric pressure outdoors?	(HTML 1.0 KB)
Is special packaging required for transporting Vaisala Barometric Pressure Transmitters?	(HTML 0.5 KB)
What is the difference between water dewpoint and hydrocarbon dewpoint in natural gas?	(HTML 0.9 KB)
What is the difference between dewpoint and relative humidity?	(HTML 2 KB)
How often should Vaisala DRYCAP® dewpoint sensors be checked or calibrated?	(HTML 0.6 KB)
How does Lubricating Oil affect the Vaisala Drycap® dewpoint sensor?	(HTML 0.8 KB)
Can Vaisala humidity instruments output parameters other than relative humidity and temperature?	(HTML 1.0 KB)
Can the OMT355 oxygen transmitter withstand steam sterilization?	(HTML 1.0 KB)
Can the HMT360N for measuring moisture in natural gas be installed after a glycol dryer or is residual glycol a problem?	(HTML 0.4 KB)
Is the Vaisala DRYCAP® sensor flow sensitive?	(HTML 1.0 KB)
Does gas flow rate affect the measurement in carbon dioxide and oxygen products?	(HTML 0.6 KB)
Can the laser in the oxygen transmitter be tuned to measure gases other than oxygen?	(HTML 0.6 KB)
Can the laser in the OMT series of oxygen transmitters be replaced?	(HTML 0.3 KB)
What is a warmed probe?	(HTML 1 KB)
What is the lifetime of the laser used in the oxygen transmitter?	(HTML 0.4 KB)
Will other gases affect the measurement performance of the Vaisala SPECTRACAP® oxygen sensor?	(HTML 0.8 KB)
Is it possible to calibrate Vaisala humidity products myself?	(HTML 1 KB)
Why don’t Vaisala’s moisture-in-oil instruments offer a ppm output for measuring moisture in lubricating oil?	(HTML 0.9 KB)
What is intrinsic safety?	(HTML 0.8 KB)
What does “cleaned for use with 100% oxygen” mean?	(HTML 0.7 KB)
What is the effect of pressure on dewpoint?	(HTML 1 KB)
How is the SPECTRACAP sensor different from the Vaisala CARBOCAP NDIR sensor	(HTML 0.8 KB)
How does pressure affect the measurement for the SPECTRACAP oxygen sensor	(HTML 0.9 KB)
What are hysteresis and repeatability?	(HTML 1 KB)
Is TDL(Tunable Diode Laser) a completely new technology?	(HTML 0.5 KB)
How will dust and dirt affect the measurement for the SPECTRACAP oxygen sensor	(HTML 0.9 KB)
How does the CARBOCAP, NDIR (non-dispersive infrared), single beam, dual wavelength sensor work	(HTML 2 KB)
Can I calibrate and adjust Vaisala pressure measurement products myself?	(HTML 0.5 KB)
A dewpoint instrument or a relative humidity instrument?	(HTML 1 KB)
How do temperature and pressure effect CO2 measurement?	(HTML 2 KB)
How can condensation be avoided when sampling from incubators?	(HTML 0.8 KB)
Does it make a difference at which O2 peak the instrument is operating	(HTML 0.6 KB)

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Frequently Asked Questions