Can a customer recalibrate his/her own unit?
Yes and no. When the unit is calibrated, an EEPROM is programmed with the calibration data. A customer cannot do a full calibration in the field. However, a field calibration adjustment is possible through the software. Again, this is not a full calibration. TSI recommends a full annual calibration. See Application Note TI-112 for details.
Can I buy the printer paper somewhere other than TSI?
Yes. Any thermal paper with the dimensions of width 2-1/4 inches and an outside roll diameter of not larger than 1 inch will work for the Portable Printer.
Can portable air velocity meters use rechargeable batteries?
You can use rechargeable batteries in all of the portables except for the Model 8340 NOTE: Rechargeable batteries will nullify the intrinsic safety rating on the Model 8340. Also, rechargeable batteries don't last as long as alkaline batteries.
Can the portable air velocity meters be connected to a printer?
Most TSI hand-held instruments (with the exception of Model 8330 and 8340) can be used with a printer supplied by TSI or any printer that will accept an RS-232 serial input. TSI printers include a properly wired interface cable; non-TSI printers may require a special cable.
Can the portable meters be connected to a computer?
The VelociCalc® and VelociCalc® Plus meters can be interfaced to a computer through the serial connector using the optional Model 8940 Computer Interface Cable. The VelociCheck® meters cannot be connected to a computer.
Can the VelociCalc® and VelociCheck® instruments read to zero ft/min?
The low end of the velocity specification for the VelociCalc® meters is 30 ft/min (0.15 m/s). The units will read air velocities between zero and the minimum specified, however, the accuracy is uncertain.
Do the air velocity meters recharge batteries in the instrument?
No. Rechargeable batteries must be externally charged.
Does TSI offer a model to be used in high temperatures?
The Model 8702 and 8705 can be used when connected to a Pitot tube in a high temperature, high velocity environment.
How long is the warranty period for the portable air velocity meters?
The portable air velocity meters all have a two-year warranty. See the instruction manual for details.
How often should I recalibrate my Portable Air Velocity Meter?
To maintain a high degree of accuracy in your measurements, TSI recommends that you return your instrument to the factory for an annual NIST traceable recalibration.
Is there a more rugged version for operating in dirty environments -- in exhaust stacks, chemical acid baths, etc.?
The portable air velocity meters are designed to operate in clean environments. If used in a dirty environment, dirt will collect on the sensor and change the calibration. Corrosive environments will damage the sensor.
Please explain NIST traceability
NIST is the National Institute of Standards and Technology. All test and calibration data supplied by TSI has been obtained using standards whose accuracies are traceable to NIST or has been verified with respect to instrumentation whose accuracy is traceable to NIST.
What does your two-part accuracy specification tell me for the VelociCalc® Air Velocity Meter and VelociCheck® Comput Air Velocity Meter?
The accuracy is the greater of the two components of the accuracy specification. Example: The VelociCalc® Plus Air Velocity Meter Model 8386 has an accuracy rating of ±3 percent of reading or 3 ft/min, whichever is greater. If your VelociCalc Plus meter reads 1,000 ft/min, ±3 percent of reading is ±30 ft/min. Since this is larger than ±3 ft/min, the accuracy specification at 1000 ft/min is ±30 ft/min.
What is considered a high velocity?
Any velocity over 1,000 ft/min.
What is the repeatability of TSI instruments?
The repeatability is included in the accuracy specifications.
What standards do the portable air velocity meters comply with?
Units are supplied with a certificate of calibration traceable to the National Institute of Standards and Technology (NIST NOTE: Rechargeable batteries will nullify the intrinsic safety rating on the Model 8340. Also, rechargeable batteries don't last as long as alkaline batteries.
What type of special versions are available for portable air velocity meters?
The family of portable air velocity meters offers a wide variety of features and ranges to meet the needs of most applications; therefore, no special versions are available.
Why can't I read velocity and temperature at the same time?
On the VelociCalc® Plus Meter models you can read velocity and temperature at the same time. Temperature displays in the upper left corner of the display while the velocity displays in larger size on the lower half of the display. However, on earlier Models, the thermal anemometer and the temperature sensor were placed within close proximity and the thermal anemometer affected the temperature of the surrounding air. When velocity is being taken, temperature readings read too high. With the VelociCalc Plus meter, the temperature sensor is placed further away from the thermal anemometer to avoid this phenomenon.
Why do the readings fluctuate?
The pressure sensor in our micromanometers responds quickly to changes. The fluctuating readings you see are actually variations in the pressure. To reduce the fluctuation, select a longer time constant to dampen the display or move the sensor into a less turbulent area.