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This probe uses the 20 k NTC Thermistor. The thermistor is a variable resistor whose
resistance decreases nonlinearly with increasing temperature. The best-fit
approximation to this nonlinear characteristic is the Steinhart-Hart equation. The CBL 2
or CBL interface measures the resistance value, R, at a particular temperature, and
converts the resistance using the Steinhart-Hart equation:
where T is temperature (°C), R is the measured resistance in k , K
K
= 2.22468
10
X
1
conversion for you, and provide readings in °C (or other units, if you load a different
calibration).
Stainless Steel Temperature Sensor Specifications
Channels
Current drain
Temperature range
Maximum temperature
sensor can tolerate
without damage
10-bit resolution
Temperature sensor
Accuracy
Response time
Probe dimensions
Pins used
CBL 2 Technical Reference
T = [K
+ K
(ln 1000R) + K
0
1
-
4
, and K
= 1.33342
X
2
Connects to CH1, CH2, CH3 (analog channels)
0.5 mA max.
-25 to 125 C (-13 to 257 F)
150 C
0.32 C (-25 to 0 C)
0.12 C (0 to 40 C)
0.4 C (40 to 100 C)
1.0 C (100 to 125 C)
20 k NTC Thermistor
±0.2 C at 0 C, ±0.5 C at 100 C
95% of full reading: 11 seconds
98% of full reading: 18 seconds
100% of full reading: 30 seconds
Probe length (handle plus body): 16 cm
Stainless steel body: length 11 cm,
diameter 4.0 mm
Probe handle: length 5.0 cm, diameter 1.25 cm
2
Ground
3
Vres
4
auto-ID resistor
6
Signal
(ln 1000R)
3
]
-1
– 273.15
2
-7
10
. Fortunately, CBL 2 and CBL take care of this
-
3
= 1.02119
10
,
X
0
11
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