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231 231P 234/234D
Thermometry
Number of inputs 1 1 1
Measurement type 4-lead differential 4-lead differential 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 (Ω) 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 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 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/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		 NA NA
GaAIAs diode Recommended for
T ≥ 4.2 K and B ≤ 5 T		 NA NA
Platinum NA Recommended for
T > 4.2 K and B < 2.5 T		 NA
Carbon-glass NA NA Recommended for
T ≥ 2 K and B ≤ 19 T
Germanium NA NA Not recommended
CernoxTM NA NA Recommended
1 Click here for sample calculations of typical sensor performance
231 231P 234/234D
Output
Number of outputs 1 1 1
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) 10 V (500 Ω max load) 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
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 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/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 NA NA 6-Digit LED
Display units NA NA Temperature in K; Sensor units in Ω
Sensor units resolution NA NA Range dependent (see table)
Temperature resolution NA NA Range dependent to 1 mK - no better than measurement resolution
Serial interface baud rate NA NA 9600
Timing format NA NA Asynchronous
Bits/character NA NA 1 start, 8 data, 1 stop
Parity type NA NA None
Voltage levels NA NA ElA
Terminators NA NA Carriage return (CR), line feed (LF)
Connector NA NA RJ11 telephone type jack
General
Ambient temperature range 15 °C to 35 °C 15 °C to 35 °C 15 °C to 35 °C
Power requirements ±5 (±0.25) VDC,
(500 mA), 2.5 W 		±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 see diagrams see diagrams
Mounting VME end panel and back plane: transmitters do not use electrical bus format, only its physical shape and power VME end panel and back plane: transmitters do not use electrical bus format, only its physical shape and power 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		 100 mm H × 160 mm D
× 30.5 mm W		 234: 100 mm H × 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)
Click to Enlarge
2308-1
Click to Enlarge
2308-12
Click to Enlarge
2001
Click to Enlarge
2002
Click to Enlarge
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).

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