Isotech TTI-22 Specifications

The Source for Calibration Professionals

TTI-22

True Temperature

Indicator

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.

Simple to use

High Accuracy

High Resolution

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.

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.

Key Features...

• No mechanical relays, long life

• Warns if calibration due date exceeded

• Accuracy to 0.001°C, 1mK

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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.

TTI-22

True Temperature Indicator

The TTI-22 continually compares the connected
sensor to a highly stable precision internal reference

Recommended probes include the Isotech 909/100

and 670SQ /100, 935-14-16, 935-14-95L and H.
resistor. For a Pt100 at 0°C the annual stability for
absolute measurement is typically ±1.3mK
(5ppm x 100Ω = 0.5mΩ / 1.3mK).

The TTI-22 includes Cal Notepad software for easy

monitoring and logging of data. It is fully compatible

with Isotech I-CAL Easy which can automate
For comparison calibration, when a reference

comparison calibration.
probe is compared to a calibrated standard, the long
term stability is not important as any change of value

Technical Specications

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.

Tiempo de Medida

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.

Inputs

Measuring

Current

Self Heating
Test Current

Measuring

Range

Resolution

Uncertainty of

Measurement

2 channel
Pt100 (BS EN 60751 / IEC 751)
O 25.5/100Ω SPRT a ITS-90

0.4mA

0.29mA (0.41mA/ √2)

1.44 seconds for both channels

-250 to 960°C (0 to 440 Ohm)

Temperature: 0.001°C, 1mK 100 Ohm PRT
Resistance: 0.00004Ω, 40 µΩ

Temperature: 0.001°C, 1mK 100 Ohm PRT
Resistance: 400mΩ @ 20°C

Instrument only, uncertainty with sensor
dependant on range and sensor type.

Reference

Resistor

Interfase

Ambient

Temperature

Range

Power Supply

Case

Dimensions

Weight

158 Brentwood Drive, Unit #4 Colchester, Vermont, USA 05446

Email: [e-mail]

Internal 380Ω
TCR ±0.3ppm / °C
Stability ±5ppm / year

RS232, Ethernet, built-in web server
provides simple temperature display

10°C a 30°C

7.5VDC, 250mA power adaptor
or 2 x AA batteries
(typically >10 hours operating time)

Width 7.5”
Height 4.4”
Depth 9.4”

3.96 lbs.

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Website: www.isotechna.com

190mm

112mm

240mm

Isotech North America

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Fax: [phone]