Two Dimensional Instruments
ThermaViewer Specifications
Description:
ThermaViewer is a carefully engineered temperature only or temperature/RH recorder, which displays days, weeks, months and even years of temperature history on its large LCD panel display. The encrypted temperatures can be downloaded (typically once every few months), to a computer with the TView program for archiving or printing. Archived data can be stored to disk and examined in graphic or tabular form.
Details:
The ThermaViewer stores 80,000 data samples per channel, which means that it will store over 1.5 year of data if your are sampling temperature only. If you are logging temperature and humidity it will story slightly less than one year of history for each of the four channels (2-temp & 2 RH) if data is recorded every ten minutes. Although the ThermaViewer can store and display temperature from absolute zero to thousands of degrees, the actual temperatures collected depends on the sensors being used.
Sensors with accuracy to ± 0.3°C, suitable for monitoring refrigerators, freezers, super cold freezers, incubators, computer rooms, laboratories, ovens, etc are available.
A password-protected menu is used to set system and display parameters such as high and low temperatures, sampling intervals, display interval and alarm/relay levels. Since the menu system is password protected the ThermaViewer can be placed in high traffic areas so that every staff member can be part of your quality control process.
The ThermaViewer is powered by a 12vdc power adapter with a 9vdc battery backup. It enters battery mode where the display 'sleeps' if power is interrupted. While the display is asleep, the sensors continue to collect temperatures for several days. In the event that power is not restored before the 9vdc battery is depleted, the stored data will still be retained for awhile, although the unit will not collect new data. Once power is restored, the display wakes up.
The ThermaViewer Display:
The Liquid Crystal Display is a black & white, backlit, graphic display, controlled by a microprocessor which displays 180 columns of temperature data at all times. This means that three hours of data is displayed if data is being recorded once a minute, or thirty hours of data is displayed if data is being recorded once every ten minutes. However, it is possible to view more than 180 temperatures on the display at one time. Each time the 'zoom out' button is pressed, the number of temperatures displayed doubles. This unique feature makes it possible to display over 23,000 temperatures on the LCD at one time. While in a zoomed-out mode a solid black vertical data bar (High-Low Bar or HL Bar) is drawn in each column showing temperature. The top of the data bar is the high temperature for the interval and the bottom end of the bar shows the low temperature. This feature works like the stock market charts which show months of data with daily high and low prices graphed in each column.
To view previous temperatures, the user scrolls backwards using the 'left arrow button'. Continuing to scroll beyond the left margin of the LCD will cause additional data to scroll into view. This makes it possible to see months of data in great detail a few days or hours at a time.
The bottom two rows of the display are used for system-data showing the scale for both row and column values as well as the current temperature, date, and time.
Technical Specifications:
| Number of Channels | Temperature only - 2, temp/RH - 4 |
| Size | 8 3/8" x 5" x 1 3/8" |
| Sample Interval | User selectable 5 sec-24 hrs |
| Display Resolution | 0.1° on LCD, 0.0001 on PC |
| Temp Range: | Sensor dependent. |
| Digital sensor: | -20°C to 75°C (~±1.0°C Typical) (can not be calibrated) |
| Thermistor: | -20°C to 75°C (±0.3°C), ( ±.2°C option) |
| Thermistor/RH: | -20°C to 75°C (±0.3°C), ±2.5% RH 0.5% Repeatability |
| Thermistor with SS sensor: | -62°C to 120°C (±0.3°C) |
| K Thermocouple: | -200°C to 1250°C (±1.2°C CJC Typical). |
| CJC = cold junction compensation | |
| -200°C to -74°C | 2% |
| -168°C to +285°C | ±2.3°C or ±0.75% |
| +285°C to +816°C | .75% |
| +816°C to 1250°C | 1.75%. |
| Humidity | 2% - 99% (± 2% at 23°C) Noncondensing |
| Calibration | Optional NIST traceable |
| Characterization: | One - three point table stored on 02 or 05 sensors |
| Data Storage Technique | Battery backed-up SRAM |
| SRAM | 80000 samples per channel |
| Power | 15-18vdc, 50/60hz (wall adaptor) 400-700mA |
| Battery Backup | >40 hrs w sleep mode set to 30 seconds. 9vdc battery. |
| Output to PC | RS232 via custom cable |
| PC Software | Site license included |
| Indicators | LCD & LED |
| Controls | Seven buttons on membrane switch |
| User Settings | Via onboard password protected menu system |
| LCD Pixels | 240 horizontal x 128 vertical |
| LCD Temperatures | Operating 0°C to 50°C, storage -20°C to 68°C |
| LCD size | 2.5" x 4.5" |
| LED | Green indicates AC power present |
| Relay | Contact with 2 terminal clamp<30v fused for .1 amp |
| Alarm conditions | min & max for time interval |
| Mounting | Wall mount via screw slots or industrial Velcro. |
| Display weight | 1 lb |
| Shipping weight | 4.0 lbs with power adaptor, sensors & cables |