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The SBIR Model 104 High Resolution Differential Thermometer provides high accuracy temperature measurement without sacrificing ease of use. The Model 104 is suitable both for general-purpose thermometry and for specialized applications such as the calibration of differential blackbody sources. Two ultra-stable thermistor probes are included, allowing the instrument to simultaneously display the temperature of two points and also the temperature difference between these two points.

F

Advanced Probe Design
Thermistor temperature sensors are more rugged than platinum resistance thermometers. The selected thermistor material is hermetically sealed and aged (annealed) to achieve basic stability equal to the best industrial platinum sensors. The digital processing of the sensor output solves the linearization and interchangeability problems normally associated with thermistors. The result is a sensor with the high accuracy and stability of wirewound platinum, and the improved ruggedness of a thermistor. The innovative temperature sensors are easy to install and remove. The long probe body greatly reduces stem conduction errors.

High Accuracy and Stability
The temperature measurement circuitry of the Model 104 has been optimized for high accuracy and stability. Critical analog circuitry is carefully shielded and isolated to ensure precise measurements in changing ambient conditions.

Ease Of Calibration
Model 104 features SBIR’s innovative closed case calibration scheme. The thermometer is calibrated without internal trimpot adjustments or reprogramming of EPROMs. This fast and easy digital calibration method is incorporated into many SBIR instruments.

Recorder Output
An analog output is provided which is proportional to the measured temperature. The absolute temperature of probe 1, the absolute temperature of probe 2, or the differential temperature may be selected as the output.

Alternate Temperature Sensor Calibration
Calibration data for two sets of temperature probes (total of four probes) can be stored in the instrument. The alternate probes have an internal code which is read by the instrument so that the proper calibration curve is applied automatically.

O P T I O N S

IEEE Std. 488 Computer Interface (GPIB) (Option G)
This option allows temperature to be read over the IEEE Bus, making the instrument suitable for automatic test and calibration applications.

RS-232 Serial Interface (Option S)
An optional Serial interface provides computer control of all thermometer and readout functions.

Rack Mounting
The thermometer is designed for bench top or standard 19" rack use. Rack mounting ears come standard with the instrument. A rack slide kit is also available.

Additional Probe Set
A second set of probes is available. Other styles are available to meet specific customer applications. High temperature probes are available for temperature measurement up to 200º C.

S P E C I F I C A T I O N S

Parameter	Test Condition	Accuracy	Accuracy Standard Probes	Accuracy High Temperature Probes
T1	5°C < T1 < 45°C	.01°C	.01°C	.015°C
	All Other	.05% (T1-25°C)	.05% (T1-25°C)	.075% (T1-25°C)
T2	5°C < T2 < 45°C	.01°C	.01°C	.015°C
	All Other	.05% (T2-25°C)	.05% (T2-25°C)	.075% (T1-25°C)
T	15°C < T1 < 35°C -10°C < T < 10°C	.01°C	.01°C	.015°C
	15°C < T2 < 35°C -10°C < T < 10°C	.01°C	.01°C	.015°C
	All other	T1 accuracy + T2 accuracy	T1 accuracy + T2 accuracy	T1 accuracy + T2 accuracy

Outline Drawings in PDF Format

Controller

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O R D E R   I N F O R M A T I O N

The Model 104 thermometer is supplied with one pair of standard probes. A thermometer with an optional IEEE Std. 488 interface is designated as Model 104G. A thermometer with an optional RS-232 interface is designated as a Model 104S. Other features such as non-standard cable lengths and rack slide kits should be specified on the purchase order. Contact SBIR for assistance in selecting standard or custom systems.