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Quite simply, the Isotech TTI-22 High Accuracy Thermometer sets new standards in the price to performance ratio for industrial and secondary resistance thermometry. If you need high accuracy at an affordable price you have to look at the TTI-22.

The TTI-22 has an accuracy of 0.001°C and a resolution of 0.0001°C (0.00004 Ohms). It has two input channels, is lightweight (4 lbs.) and will operate for more than 10 hours from two small AA cells. It has both RS232 and Ethernet ports.

Simple to use, supporting both Industrial probes and SPRTs to ITS-90, 25.5 and 100 Ohm. Up to 30 probe calibrations can be stored along with the calibration expiry date so the instrument can warn when the calibration time has been exceeded.

Built in statistics calculation can show you both the measured and average values along with the standard deviation over previous measurements. The Isotech TTI-22 is ideal as a reference standard alongside liquid calibration baths, for the smallest uncertainty calibration with Dry Blocks or for demanding stand alone measurement applications.

Previously this level of performance was confined to specialist laboratories with expensive thermometry bridges; TTI-22 delivers 5 to 10 times the performance of comparably priced instruments.

The TTI-22 uses the same patented measurement technique as the earlier TTI-2.

Each measurement performs a zero point and gain correction.

The switched polarity DC measuring current (0.4mA) eliminates thermal EMFs.

Surface mount construction ensures long term reliability.

Key Features...

• No mechanical relays, long life
• Warns if calibration due date exceeded
• Accuracy to 0.001°C, 1mK

The TTI-22 continually compares the connected sensor to a highly stable precision internal reference resistor. For a Pt100 at 0°C the annual stability for absolute measurement is typically ±1.3mK (5ppm x 100_ = 0.5m_ / 1.3mK).

For comparison calibration, when a reference probe is compared to a calibrated standard, the long term stability is not important as any change of value is cancelled in the comparison. The temperature coefficient is 0.3ppm / °C and the measuring time, for both channels, is just 1.44 seconds.

The instrument can be configured to measure the resistance ratio of the two input channels, a technique familiar to users of older style thermometry bridges.

The overall uncertainty of the instrument and probe together will be determined by the model of probe and the temperature range. For the majority of applications the contribution of the instrument uncertainty will be negligible compared to the uncertainty of the calibrated probe.

Technical Specifications

• Inputs: 2 channel; Pt100 (BS EN 60751/IEC 751); O 25.5/100Ω SPRT a ITS-90
• Measuring Current: 0.4mA
• Self-Heating Test Current: 0.29mA (0.41mA/√2)
• Tiempo de Medida: 1.44 seconds for both channels
• Measuring Range: -250 to 960°C (0 to 440 Ohm)
• Resolution: Temperature: 0.001°C, 1mK 100 Ohm PRT; Resistance: 0.00004, 40 μ
• Uncertainty of Measurement: Temperature: 0.001°C, 1mK 100 Ohm PRT; Resistance: 400m @ 20°C
• Reference Resistor: Internal: 380Ω; TCR - ±0.3ppm / °C; Stability: ±5ppm / year
• Interfase: RS232, Ethernet, built-in web server provides simple temperature display
• Ambient Temperature Range: 10°C a 30°C
• Power Supply: 7.5VDC, 250mA power adaptor or 2 x AA batteries (typically >10 hours operating time)
• Case Dimensions: Width - 7.5" 190mm; Height - 4.4" 112mm; Depth - 9.4" 240mm
• Weight: 3.96 lbs.