3B Scientific 1021413 [U8557830] NTC Thermistor Probe, 4.7 kΩ Owner's Manual
3B SCIENTIFIC 1021413 [U8557830] is a water-resistant NTC resistive probe with a resistance of 4.7 kΩ at 25 °C. It is used in experiments to investigate the temperature dependence of a semiconductor resistor with a negative temperature coefficient (NTC). This is done by immersing the probe in a water bath and measuring the current through the probe with a known voltage. The probe may be immersed in boiling hot water during use. It has a maximum power of 0.2 W and a maximum voltage of 30 V DC. The total length of the probe is 0.75 m and its mass is approximately 40 g.
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3B SCIENTIFIC® PHYSICS
NTC Resistive Probe, 4.7 kΩ 1021413
Instruction Sheet
08/17 JS/SD
2
1 NTC resistor in metal sleeve
2 Connecting lead with 4 mm plugs
1
1. Safety instructions
The NTC resistive probe is intended for use in
Category I.
As a voltage source, use only power supplies with a safety isolating transformer that guarantees reliable isolation from the mains supply.
Resistive probes must not be connected to mains circuits under any circumstances.
It is important to monitor the current and voltage, and to ensure that a power dissipation of 0.2 W and a DC voltage of 30 V are not exceeded.
The NTC resistive probe may be immersed in boiling hot water during use.
Be careful when experimenting with hot water.
There is a risk of scalding!
Caution! Do not expose the power supply to any liquids.
Pull out the mains plug immediately if water should enter the power supply.
2. Description
The waterresistant NTC resistive probe, 4.7 kΩ is used in experiments to investigate the temperature dependence of a semiconductor resistor with a negative temperature coefficient
(NTC). This is done by immersing the probe in a water bath and measuring the current through the probe with a known voltage.
3. Technical data
Probe: B57891-M472-K
Resistance at 25 °C: 4.7 kΩ (±10 %)
B
25/100
coefficient: 3980 K (±3 %)
Maximum temperature: 120 °C
Max. power: 0.2 W
Max. voltage:
Category:
30 V DC
CAT I
Connection:
Total length:
Mass:
4 mm safety plug
0.75 m approx. 40 g
1
4. Operation 6. Disposal
When the time comes for the device itself is to be scrapped, it does not belong in the normal domestic waste. If the device is used in private households, it may be disposed of at the local public disposal facilities.
Observe the applicable regulations for the disposal of electronic waste.
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3
2
1
Measure the current at 10 V DC as a function of the temperature of the water bath, and calculate the resistance from this.
5. Measurement example
Measurement result:
R / k
5
0
20°C 30°C 40°C 50°C 60°C 70°C 80°C
Conversion:
R
B
T T
B
25 °C where R (25 °C) = 4.571 kΩ, B = 4127 k
3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪ www.3bscientific.com
Technical amendments are possible
© Copyright 2017 3B Scientific GmbH

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