Transmitters - Technical Specifications - Lake Shore Cryotronics, Inc.

Home > Products > Temperature Instruments > Transmitters

231

231P

234/234D

Thermometry

Number of inputs

Measurement type

4-lead differential

Sensor type

Silicon diode, GaAIAs diode

Platinum

Carbon-glass, Germanium, Cernox™

Sensor temperature coefficient

Negative

Positive

Negative

Sensor units

Volts (V)

Ohms (W)

Input range

0 to 5 V

0 W to 312 W

1 W to 300 kW

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 factory

One curve, loaded at the factory 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 W/K at 30 K
0.42 W/K at 77 K
0.39 W/K at 300 K
0.34 W/K at 800 K

-700 W/K at 4.2 K
-24 W/K at 10 K
-0.15 W/K at 77 K
-0.02 W/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 mW

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 W ±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/ºC

3 mK/ºC at 4.2 K
3 mK/ºC at 77 K
1.2 mK/ºC at 300 K

0.002% of resistance rdg/ºC

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

0.0125% of resistance rdg/ºC

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

Magnetic Field Use

Silicon diode

Recommended for
T ≥ 60 K and B ≤ 3 T

GaAIAs 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^TM

Recommended

¹ Click here for sample calculations of typical sensor performance

231

231P

234/234D

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 W 0.02%, 25 ppm resistor)
(all models)

Output compliance

10 V (500 W 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

0 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

Current (%/ºC ambient)

Temperature equivalence

Range 1

Range 2

Range 3

Range 4

Range 5

Range 6

±0.0055% of output current

per ºC

1 mK/ºC

6 mK/ºC

12 mK/ºC

18 mK/ºC

26 mK/ºC

55 mK/ºC

±0.0055% of output current

per ºC

Not used

6 mK/ºC

12 mK/ºC

18 mK/ºC

26 mK/ºC

55 mK/ºC

±2 µA/ºC (±0.01%/ºC)

±1 mK/ºC

±2 mK/ºC

±10 mK/ºC

±20 mK/ºC

±30 mK/ºC

±25 mK/ºC

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

500 W, 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/ºC ambient)

Temperature equivalence

Range 1

Range 2

Range 3

Range 4

Range 5

Range 6

±0.008%/ºC

2 mK/ºC

8 mK/ºC

16 mK/ºC

26 mK/ºC

38 mK/ºC

80 mK/ºC

±0.008%/ºC

Not used

8 mK/ºC

16 mK/ºC

26 mK/ºC

38 mK/ºC

80 mK/ºC

±1.25 mV/ºC (±0.01%/ºC

±0.0025%/ºC of load resistor)

±1.2 mK/ºC

±2.5 mK/ºC

±12 mK/ºC

±25 mK/ºC

±36 mK/ºC

±30 mK/ºC

Display (234D only)

Display type

6-Digit LED

Display units

Temperature in K; Sensor units in W

Sensor units resolution

Range dependent (see table)

Temperature resolution

Range dependent to 1 mK - no better than measurement resolution

Serial interface baud rate

9600

Timing format

Asynchronous

Bits/character

1 start, 8 data, 1 stop

Parity type

None

Voltage levels

ElA

Terminators

Carriage return (CR), line feed (LF)

Connector

RJ11 telephone type jack

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;
234D: 750 mA, 3.75 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 mmH × 160 mm D × 30.5 mm W
234D: 43.18 mm H × 228.6 mm D × 139.7 mm W

Weight

0.25 kg (0.5 lb)

0.25 kg (0.5lb)

0.25 kg (0.5 lb)

2308-1

2308-12

2001

2002

2003

Single Card Case (part number 2308-1)

The single card enclosure can hold 1 temperature transmitter. Typical physical dimensions of the Model 2308-1 Benchtop Enclosure are provided in the drawing. A wall plug-in power supply is required for the transmitter in this enclosure. See the ordering information for the model numbers of the transmitters with a wall mount power supply.

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 ºC to 35 ºC (59 ºF to 95 ºF)
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 (750 mA for 234D).

.......................................................................................................
You may also be interested in...
	Cryogenic Temperature Sensors
	Measure temperatures from <20 mK to over 1,500 K. A wide selection of diodes, RTDs, thermocouples, and mounting packages are available. Click here for more information on cryogenic temperature sensors.