Home > Products > Discontinued Products > Discontinued Products > Model 231, 231P, and 234 Temperature Transmitters/technical-specifications

The 230 Series transmitters are discontinued. Please consider the 240 Series as a replacement.

230 Series Specifications

231

231P

234

Thermometry

Number of inputs

Measurement type

4-lead differential

Sensor type

Silicon diode, GaAlAs diode

Platinum

Carbon-glass, germanium, Cernox^®

Sensor temperature coefficient

Negative

Positive

Negative

Sensor units

Volts (V)

Ohms (Ω)

Input range

0 to 5 V

0 Ω to 312 Ω

1 Ω to 300 kΩ

Sensor excitation

10 µA ±0.1% DC current

500 µA ±0.02% DC current

Constant voltage pinned at 5 mV or 10 mV dependent on resistance range

Update rate

5 readings per s

4 readings per s (2 readings per s on Scale 0 only)

Precision curve storage

One curve loaded at Lake Shore

One curve, loaded at Lake Shore or in the field via serial interface

Example Lake Shore sensor

DT-470-C0

PT-103

CGR-1-1000 with 1.4L calibration

Sensor temperature range

1.4 K to 475 K

30 K to 800 K

1.4 K to 325 K

Standard curve

Lake Shore Curve 10

IEC 751

Requires calibrated sensor and CalCurve™

Typical sensor sensitivity¹

-30 mV/K at 4.2 K
-1.9 mV/K at 77 K
-2.4 mV at 300 K

0.19 Ω/K at 30 K
0.42 Ω/K at 77 K
0.39 Ω/K at 300 K
0.34 Ω/K at 800 K

-700 Ω/K at 4.2 K
-24 Ω/K at 10 K
-0.15 Ω/K at 77 K
-0.02 Ω/K at 300 K

Measurement resolution¹

Sensor units

Temperature equivalence

76.3 µV

2.5 mK at 4.2 K
40 mK at 77 K
32 mK at 300 K

4.8 mΩ

22 mK at 30 K
11 mK at 77 K
13 mK at 300 K
14 mK at 800 K

Range dependent

±0.04 mK at 4.2 K
±0.12 mK at 30 K
±6.6 mK at 77 K
±67 mK at 300 K

Electronic measurement accuracy¹

Sensor units

Temperature accuracy

±75 µV ±0.01% of reading

±0.07 K at 4.2 K
±0.16 K at 77 K
±0.12 K at 300 K

±0.05 Ω ±0.05% of reading

±0.2 K at 30 K
±0.15 K at 77 K
±0.3 K at 300 K
±0.7 K up to 800 K

Range dependent (see table)

±2 mK at 4.2 K
±8 mK at 10 K
±18 mK at 77 K
±1.2 K at 300 K

Measurement temperature coefficient

Sensor units (% of reading /°C ambient)

Temperature equivalence

0.0006% of resistance rdg/°C

3 mK/°C at 4.2 K
3 mK/°C at 77 K
1.2 mK/°C at 300 K

0.002% of resistance rdg/°C

0.4 mK/°C at 30 K
1 mK/°C at 77 K
6 mK/°C at 300 K
18 mK/°C at 800 K

0.0125% of resistance rdg/°C

±0.18 mK/°C at 4.2 K
±0.8 mK/°C at 10 K
±18 mK/°C at 77 K
±100 mK/°C at 300 K

Magnetic field use

Silicon diode

Recommended for
T ≥ 60 K and B ≤ 3 T

GaAlAs diode

Recommended for T ≥ 4.2 K and B ≤ 5 T

Platinum

Recommended for
T > 4.2 K and B < 2.5 T

Carbon-glass

Recommended for
T ≥ 2 K and B ≤ 19 T

Germanium

Not recommended

Cernox^®

Recommended

¹ Click here for sample calculations of typical sensor performance

231

231P

234

Output

Number of outputs

Output type

Current source, isolated from power source—output or sensor can be grounded, but not both
(all models)

Output range

4 mA to 20 mA or 0 mA to 20 mA (for 0 V to 10 V with provided 500 Ω 0.02%, 25 ppm resistor)
(all models)

Output compliance

10 V (500 Ω max load)

Output temperature ranges

Range 1

Range 2

Range 3

Range 4

Range 5

Range 6

0 K to 20 K

0 K to 100 K

0 K to 200 K

0 K to 325 K

0 K to 475 K

0 K to 1000 K

0 K to 20 K

0 K to 100 K

0 K to 200 K

0 K to 325 K

0 K to 475 K

0 K to 1000 K

0 K to 10 K

0 K to 20 K

0 K to 100 K

0 K to 200 K

0 K to 300 K

75 K to 325 K

4 mA to 20 mA output

Output resolution

Current

Temperature equivalence

Range 1

Range 2

Range 3

Range 4

Range 5

Range 6

1.22 µA (0.006% of full scale)

1.5 mK

7.6 mK

15.3 mK

24.8 mK

36.2 mK

76.3 mK

1.22 µA (0.006% of full scale)

Not used

7.6 mK

15.3 mK

24.8 mK

36.2 mK

76.3 mK

1.22 µA (0.006% of full scale)

0.8 mK

1.5 mK

7.6 mK

15.3 mK

22.9 mK

19.1 mK

Output accuracy

Current

Temperature equivalence

Range 1

Range 2

Range 3

Range 4

Range 5

Range 6

±2 µA (±0.01% of full scale)

2.5 mK

12.5 mK

25 mK

41 mK

59 mK

125 mK

±2 µA (±0.01% of full scale)

Not used

12.5 mK

25 mK

41 mK

59 mK

125 mK

±5 µA (±0.025% of full scale)

3.1 mK

6.2 mK

31.2 mK

62.5 mK

93.7 mK

78.1 mK

Output temperature coefficient c

Current (%/°C ambient)

Temperature equivalence

Range 1

Range 2

Range 3

Range 4

Range 5

Range 6

±0.0055% of output current

per °C

1 mK/°C

6 mK/°C

12 mK/°C

18 mK/°C

26 mK/°C

55 mK/°C

±0.0055% of output current

per °C

Not used

6 mK/°C

12 mK/°C

18 mK/°C

26 mK/°C

55 mK/°C

±2 µA/°C (±0.01%/°C)

±1 mK/°C

±2 mK/°C

±10 mK/°C

±20 mK/°C

±30 mK/°C

±25 mK/°C

0 mA to 20 mA output (0 V to 10 V with

500 Ω, 0.02% load resistor)

Output resolution

Voltage

Temperature equivalence

Range 1

Range 2

Range 3

Range 4

Range 5

Range 6

0.6 mV

1.2 mK

6.1 mK

12.2 mK

19.8 mK

29 mK

61 mK

0.6 mV

Not used

6.1 mK

12.2 mK

19.8 mK

29 mK

61 mK

0.61 mV

0.6 mK

1.2 mK

6.1 mK

12.2 mK

18.3 mK

15.2 mK

Output accuracy

Voltage

Temperature equivalence

Range 1

Range 2

Range 3

Range 4

Range 5

Range 6

3 mV (0.03% of full scale)

6 mK

30 mK

60 mK

98 mK

143 mK

300 mK

3 mV (0.03% of full scale)

Not used

30 mK

60 mK

98 mK

143 mK

300 mK

±4.5 mV (±0.025% of full scale

±0.02% resistor accuracy)

4.5 mK

9.0 mK

45.0 mK

90.0 mK

135 mK

112.5 mK

Output temperature coefficient

Voltage (% output/°C ambient)

Temperature equivalence

Range 1

Range 2

Range 3

Range 4

Range 5

Range 6

±0.008%/°C

2 mK/°C

8 mK/°C

16 mK/°C

26 mK/°C

38 mK/°C

80 mK/°C

±0.008%/°C

Not used

8 mK/°C

16 mK/°C

26 mK/°C

38 mK/°C

80 mK/°C

±1.25 mV/°C (±0.01%/°C

±0.0025%/°C of load resistor)

±1.2 mK/°C

±2.5 mK/°C

±12 mK/°C

±25 mK/°C

±36 mK/°C

±30 mK/°C

General

Ambient temperature range

15 °C to 35 °C

Power requirements

±5 (±0.25) VDC,
(500 mA), 2.5 W

234: ±5 (±0.25) VDC, (500 mA), 2.5 W

Enclosure type

see diagrams

Mounting

VME end panel and back plane: transmitters do not use electrical bus format, only its physical shape and power

Size

100 mm H × 160 mm D
× 30.5 mm W

234: 100 mm H × 160 mm D × 30.5 mm W

Weight

0.25 kg (0.5 lb)

0.25 kg (0.5lb)

0.25 kg (0.5 lb)

2308-12

Multiple card enclosure (part number 2308-12)

The Model 2308-12 VME card case holds up to 12 temperature transmitters. A +5 VDC power supply with universal input is provided with the case. Wall mount power supplies are not necessary with a 2308-12.

Card slots	12
Output voltage	+5 VDC, 100 mV peak to peak ripple
Output current	6 A (max)
Input power	Universal 85 to 265 VAC, 47 to 440 Hz, 60 W
Ambient temp range	15 °C to 35 °C (59 °F to 95 °F)
Enclosure mounting	Bench or full (19 in) rack
Size	450 mm W × 178 mm H × 260 mm D (17.7 in × 7 in × 10.25 in)
Weight	5.5 kg (12 lb)

Power connections

Lake Shore temperature transmitters are powered by a +5 VDC supply if the transmitter card is ordered without a rack or plug-in supply. The voltage must be regulated to within ±0.25 VDC. Each transmitter draws up to 500 mA from the supply.

2001

2002

2003