Use the following procedure to replace the batteries and reset the battery meter of the HMT140:
1. Open the case by pulling out and up with your fingers while pressing the release tab located between the two glands with your thumb. (See the HMT140 components diagram in "Wiring" section for location of release tab as shown here).
3. Remove the batteries by pulling them up firmly. If the battery does not come out easily, one of the battery tabs can be pulled out gently while pulling up.
4. After replacing the batteries, press and hold the service button and turn the power switch on. The LED light will flash and the device will beep 8 times.
5. Release the service button. At this point, the battery meter is also reset.
Please see the attached
document with instructions on how to complete this.
To uninstall the Vaisala Veriteq USB Logger Cable, please go to Add or Remove Programs in Windows, find FTDI USB Serial Converter Drivers and click the Change/Remove button. Follow the uninstall wizard as prompted to complete the uninstallation.
Notice for Windows XP users:
If you are experiencing problems uninstalling the cable on Windows XP, this may be due to changes made by a Microsoft Update (KB923191). To correct this problem, please follow the directions below:
If you are still unsuccessful, please contact Technical Support.
The CFR 21 Part 11 regulations apply to any electronic records that are used as a part of GMP documentation, including the ones produced by the Vaisala VL-series data logging system.
The 2000-series loggers use a thin-film capacitance relative humidity sensor. The sensor is based on a thermoset capacitive polymer and, using a three-layer capacitance construction, consists of parallel plates with porous platinum electrodes, all mounted on a silicon substrate. The electrodes are coated with a dielectric polymer that absorbs, or desorbs, water vapor from the environment with changes in humidity. The resulting change in dielectric constant causes a variance in capacitance and impedance that relates to changes in relative humidity.In operation, water vapor in the active capacitor's dielectric layer equilibrates with the surrounding gas. The porous platinum layer shields the dielectric response from external influences while the protective polymer over-layer provides mechanical protection for the platinum layer from contaminants such as dirt, dust and oils. A heavy accumulation of dirt or contamination on the sensor will not affect sensor operation except to slow down the sensor's response time.
Yes. A Validation Protocol Manual and CD for the Vaisala VL-series validation/mapping and data logger system is available. This time-saving package has been designed to help you quickly prove the effective functional performance of the system and to assist in validating the software for use within your facility. The package includes installation qualification (IQ) and operation qualification (OQ) procedures and forms to enable you to record all details needed to demonstrate that the system is working properly. This validation process provides assurance that the system has a high level of integrity and the data is accurate and reliable.
The most striking advantage of small size is usability. Smaller units are easier to carry around, easier to ship, easier to deploy, easier to use and far less obtrusive to the process being monitored. Our customers constantly tell us that our compact units are used, quite simply, far more often than existing bulkier alternatives.
In most cases, you are giving up nothing by doing small. Our experience has told us that most of our customers purchase data recording instrumentation because of a need to record just one type of measurement variable. In response to this, Vaisala Veriteq data loggers have been optimized around specific sensors or input signals that result in more compact and efficient designs, without compromising accuracy or performance.
Vaisala Veriteq data loggers have a battery life of 10 years based on continuous operation at one minute sample rates. To maximize battery life when not in use, set the logger to an infrequent sample rate such as once per hour.
You can also prolong battery life by keeping the logger out of continuous operation at extreme operating temperatures, and downloading data to your PC at frequent intervals.
If the battery does run out, contact Vaisala for a factory battery replacement. For critical applications, we recommend replacing the battery 8 years after purchase.
signal it is measuring. The greater the resolution of an instrument, the smaller the changes in the input signal that can be measured (or resolved). As an example, an 8-bit instrument can resolve to one part in 256 (2 to the power of 8), a 10-bit instrument can resolve to one part in 1024 (2 to the power of 10), and a 12-bit instrument can resolve to one part in 4,096 (2 to the power of 12). From this information, we know that a 12-bit logger has a resolution sixteen times better than an 8-bit Logger.
Yes. You can also test drive our solutions and have a percentage of the rental fee applied towards a purchase if you decide that Vaisala's system is a good fit for your needs. See our
The Vaisala 1700 data logger works with all type J, K, T, E, R and S thermocouples which are, by far, the most popular thermocouple types in use today.
Choosing a proper thermocouple type for your application depends primarily on the temperature range in which its use is intended. The most widely used and available thermocouples are types "K "and "J", however there are several other types that you should consider.To determine which thermocouple type best suits your application's temperature range, refer to the individual data pages for each thermocouple type (J, K, T, E, R or S). These pages include a temperature range and accuracy graph you can use for comparison with your measurement requirements.
The Vaisala Veriteq 1700 data logger thermocouple data logger monitors the cold junction temperature with the use of a high-accuracy thermistor temperature sensor on board the logger that has been bonded to the thermocouple connection point. This allows for accurate computation of the temperature at the hot junction by the data logger.
A thermocouple is the world's most popular transducer for measuring temperature. It works by generating a small millivolt electrical signal when a temperature difference exists between the two end junctions of a pair of dissimilar metals. One end of the thermocouple is fused together to form a measuring (or hot) junction, and the other end, the cold (or reference) junction, is connected to the measuring instrument such as a data logger.
Temperature at the hot (or measuring) junction of a thermocouple is determined by measuring the voltage appearing at the thermocouple's cold (or reference) junction. Since the voltage produced by the thermocouple is a function of the temperature difference between these two junctions, the cold junction temperature must be known in order to produce accurate temperature measurements.
Overall measurement accuracy depends on the accuracy of cold-junction temperature (CJT) compensation. Automatic cold junction temperature compensation is a method used to calculate accurate temperature readings measured by the thermocouple even when the temperature at the measuring instrument varies.