Primary Standards for Temperature Calibration
Standards Platinum Resistance Thermometers and
Standards Thermocouples
Isotech Equivalent
SPRTs
Model RTPW
Range
(Databook/page)
5681
25.5Ω
–200°C to 661°C
670 (DB1/30)
5683
25.5Ω
–200°C to 480°C
Meyers (DB1/29)
5684
0.25Ω
0°C to 1070°C
96178 (DB1/32)
962
(DB2/36)
5685
2.5Ω
0°C to 1070°C
No Isotech Equivalent
5698
25.5Ω
–200°C to 661°C
909/25.5 (DB2/34)
5699
25.5Ω
–200°C to 661°C
935-14-77/25.5 (DB2/35)
5686
25.5Ω
–260°C to 232°C
No Isotech Equivalent
5695
25.5Ω
–200°C to 500°C
No Isotech Equivalent
Isotech Equivalent
Gold/Platinum Thermocouple Model
Range
(Databook/page)
5629
Au-Pt TC 0°C to 1000°C
Pt/Au TC (DB2/45)
Fixed-Points - Triple Point of Water, Metal Freeze Point
Cells, Triple Point of Mercury
Fixed-Point
Isotech Equivalent
Model
Description
Temperature
Cells
(Databook/page)
5901X
Triple Point of Water (TPW)
0.01°C
Jarrett-Isotech (DB1/6)
5903
Melting Point of Gallium
29.7646°C
ITL-M-17401 (DB1/11)
5943
Melting Point of Gallium, SST
29.7646°C
ITL-M-17401M (DB2/28)
5904
Freezing Point of Indium
156.5985°C
ITL-M-17668S (DB1/15)
5905
Freezing Point of Tin
231.928°C
ITL-M-17669S (DB1/15)
5906
Freezing Point of Zinc
419.527°C
ITL-M-17671S (DB1/15)
5907
Freezing Point of Aluminum
660.323°C
ITL-M-17672S (DB1/15)
5908
Freezing Point of Silver
961.78°C
ITL-M-17673S (DB1/15)
5909
Freezing Point of Copper
1084.62°C
ITL-M-17674S (DB1/15)
5924
Open Freezing Point of Indium
156.5985°C
ITL-M-17668O (DB1/15)
5925
Open Freezing Point of Tin
231.928°C
ITL-M-17669O (DB1/15)
5926
Open Freezing Point of Zinc
419.527°C
ITL-M-17671O (DB1/15)
5927
Open Freezing Point of Aluminum
660.323°C
ITL-M-17672O (DB1/15)
5928
Open Freezing Point of Silver
961.78°C
ITL-M-17673O (DB1/15)
5929
Open Freezing Point of Copper
1084.62°C
ITL-M-17674O (DB1/15)
5901B
Mini Triple Point of Water
0.01°C
B8 (DB2/27)
B12 (DB2/23)
5914A
Mini Freezing Point of Indium
156.5985°C
ITL-M-17668 (DB2/30)
5915A
Mini Freezing Point of Tin
231.928°C
ITL-M-17669 (DB2/30)
5916A
Mini Freezing Point of Zinc
419.527°C
ITL-M-17671 (DB2/30)
5917A
Mini Freezing Point of Aluminum
660.323°C
ITL-M-17672 (DB2/30)
5918A
Mini Freezing Point of Silver
961.78°C
ITL-M-17673 (DB2/30)
5919A
Mini Freezing Point of Copper
1084.62°C
ITL-M-17674 (DB2/30)
5944
Mini Freezing Point of Indium
156.5985°C
ITL-M-17668 (DB2/30)
5945
Mini Freezing Point of Tin
231.928°C
ITL-M-17669 (DB2/30)
5946
Mini Freezing Point of Zinc
419.527°C
ITL-M-17671 (DB2/30)
5931
Triple Point of Water X Cell
0.01°C
No Isotech Equivalent
5933
Melting Point of Gallium X Cell
29.7646°C
ITL-M-17401M (DB2/28)
5934
Freezing Point of Indium X Cell
156.5985°C
ITL-M-17668M (DB2/28)
5900
Triple Point of Mercury
–38.8344°C
ITL-M-17724 (DB1/12)
Primary Standards Maintenance Apparatus
Isotech Equivalent
Apparatus
Model
Features/Use
(Databook/page)
7312
7012
7037
Maintains: two TPW cells. Compact size, runs quietly.
Hydra 798M & 798-05-03
Comparisons: –5°C to 110°C.
(DB2/12&13)
Maintains: triple point of water and gallium cells.
ITL-M-18233 (DB1/8)
Comparisons: –10°C to 110°C.
ITL-M-17402B (DB2/11)
Maintains: triple point of mercury, water and gallium cells.
ITL-M-17725 (DB1/12)
Comparisons: –40°C to 110°C.
ITL-M-18233 (DB1/8)
ITL-M-17402B (DB2/11)
9210
9230
9260
9114
Maintains: mini triple point of water and mini gallium cells.
Europa-6 (DB2/26)
Comparisons: –10°C to 125°C.
Venus 2140 (DB3/18)
Maintains: stainless steel gallium cell.
Europa-6 (DB2/26)
Comparisons: 15°C to 35°C.
Venus 2140 (DB3/18)
Maintains: indium, tin, zinc, and aluminum cells.
511 Medusa 3
Comparisons: 50°C to 680°C.
(DB3/38&39)
Maintains: indium, tin, zinc, and aluminum cells.
ITL-M-17703
Comparisons: 100°C to 680°C.
9115
9116
9117
Maintains: aluminum and silver cells.
ITL-M-17702P (DB1/24)
Comparisons: 550°C to 1000°C.
465 3 (DB1/27)
Maintains: aluminum, silver, gold, and copper cells.
ITL-M-17702S (DB1/24)
Comparisons: 400°C to 1100°C.
465 (DB1/27)
Anneals SPRTs, HTPRTs, and thermocouples to
414 (DB1/28)
1100°C. Protects them against contamination from metal ions.
7196
Affordable substitute for a triple point of argon system. Provides 461 (DB2/33)
for low-temperature comparison calibrations at
approximately –196°C with uncertainties of 2 mK.
5581
0.1 ppm accuracy for calibration of standard resistors and
TTI-3 (DB1/36)
SPRTs. 13:1 measurement ratio allows resolution to 0.001 mK.
742A
Excellent performance without oil or air baths. Values from 10
456 (DB2/42)
ohm to 10 megohm.
5430
Highest stability oil-filled resistors (< 2 ppm/year drift). AC cal
Standard Resistors S.R.
uncertainty to 3 ppm.
(DB1/40)
Thermometer Readouts
Isotech Equivalent
Readouts
Model
Probe Types
Accuracy
Features
(Databook/page)
1521
PRTs,
±0.025°C
Thermistors
Battery-powered, handheld
ASL F100
thermometer; INFO-CON
connector reads coefficients
without programming.
1522
PRTs,
±0.025°C
Thermistors
Stores up to 10,000 readings, plus ASL F100
100 more on demand; reads PRTs
and thermistors (calibrated or
uncalibrated) interchangeably.
1502A
PRTs
±0.006°C
Resolution of 0.001°C and
ASL F200
accuracy to match; uses ITS-90,
IPTS-68, CVD, or DIN (IEC 751)
conversions.
1503
HTPRTs
±0.020°C
Compact, accurate readout for
No Isotech Equivalent
high-temp PRTs; reads 0.25-,
2.5-, 3-, and 5-ohm PRTs.
1504
Thermistors
±0.003°C
Reads thermistors from 0 to 1 MW; No Isotech Equivalent
uses Steinhart-Hart and CVD.
1529
PRTs,
±0.006°C
Four channels can all be measured TTI-7 PLUS (DB3/56)
Thermistors,
simultaneously; battery-powered;
Thermocouples
logs up to 8,000 readings; flexible
display.
1560
Accepts any combination of the
TTI-7 PLUS (DB3/56)
eight modules below; all are easily TTI-6 (DB3/58)
added to and removed from the
1560 base.
2560
PRTs
±0.005°C
2 channels of 25W or 100W PRTs. 956 (DB3/61)
2561
HTPRTs
±0.013°C
2 channels to 1200°C.
No Isotech Equivalent
2562
PRTs
±0.01°C
8 channels of 2-, 3-, or 4-wire
TTI-7 internal scanner with
RTDs.
2 PRT input cards to give 8
channels. Only for TTI-7.
954 PRT switch box for 8
channels. Max of 2 boxes
for 16 channels. Can use
with TTI-7 and TTI-6.
2563
Thermistors
±0.0013°C
2 channels of resolution to
No Isotech Equivalent
0.0001°C.
2564
Thermistors
±0.0025°C
8 channels for data acquisition.
No Isotech Equivalent
2565
Thermocouples
±0.05°C
Reads all TC types with 0.0001 mV Built-in to TTI-7.
resolution.
2566
Thermocouples
±0.1°C
Reads any combination up to 12
TTI-7 internal scanner with
channels of virtually any type of
2 TC input cards to give 8
TC.
channels. Only for TTI-7.
958 TC switch box for 8
channels. Max of 2 boxes
for 16 channels.
2567
1000Ω PRTs
±0.006
2 channels of high-resistance
No Isotech Equivalent
PRTs.
2568
1000Ω PRTs
±0.01
8 channels of high-resistance
No Isotech Equivalent
PRTs.
1575
SPRTs,
±0.001°C
Thermistors
4 ppm accuracy; resolution to
TTI-2 (DB2/38)
0.0001°C for SPRTs and
0.00001°C for thermistors; 2
channels; add 10 more channels
with a mux.
1590
SPRTs,
±0.00025°
1 ppm accuracy; patented DWF
Thermistors
C
connectors; color display; add up
TTI-2 (DB2/38)
to 50 channels with muxes.
PRTs, Thermistors, Thermocouples and Liquid in Glass Thermometers
Isotech Equivalent
Reference Probes
Model
Range
Basic Accuracy†
(Databook/page)
PRTs
Secondary Standards PRTs
5626
–200°C to 661°C
±0.007°C at 0°C
935-14-77/100 (DB2/35)
5628
–200°C to 661°C
±0.006°C at 0°C
935-14-77/25.5 (DB2/35)
Secondary Reference PRTs
5612
–200°C to 420°C
±0.018°C at 0°C
Semi-Std PRT (DB3/63)
5613
–200°C to 300°C
±0.018°C at 0°C
Semi-Std PRT (DB3/63)
5614
–200°C to 420°C
±0.018°C at 0°C
Semi-Std PRT (DB3/63)
Precision Industrial PRTs
5627-6
–200°C to 300°C
±0.05°C at 0°C
Semi-Std PRT (DB3/63)
5627-9
–200°C to 420°C
±0.05°C at 0°C
Semi-Std PRT (DB3/63)
5627-12
–200°C to 420°C
±0.05°C at 0°C
Semi-Std PRT (DB3/63)
Fast Response PRTs
5622-05
–200°C to 350°C
±0.04°C at 0°C
Semi-Std PRT (DB3/63)
5622-10
–200°C to 350°C
±0.04°C at 0°C
Semi-Std PRT (DB3/63)
5622-16
–200°C to 350°C
±0.04°C at 0°C
Semi-Std PRT (DB3/63)
5622-32
–200°C to 350°C
±0.04°C at 0°C
Semi-Std PRT (DB3/63)
Small Diameter Industrial PRTs
5618A-6
–200°C to 300°C
±0.05°C
No Isotech Equivalent
5618A-9
–200°C to 500°C
±0.05°C
No Isotech Equivalent
5618A-12
–200°C to 500°C
±0.05°C
No Isotech Equivalent
Thermistors
Thermistor Standards
5640
0°C to 60°C
±0.0015°C
No Isotech Equivalent
5641
0°C to 60°C
±0.001°C
No Isotech Equivalent
5642
0°C to 60°C
±0.001°C
No Isotech Equivalent
5643
0°C to 100°C
±0.0025°C
No Isotech Equivalent
5644
0°C to 100°C
±0.0025°C
No Isotech Equivalent
Secondary Thermistor Probes
5665
0°C to 100°C
±0.015°C
No Isotech Equivalent
5610
0°C to 100°C
±0.015°C
No Isotech Equivalent
5611
0°C to 100°C
±0.015°C
No Isotech Equivalent
5674
0°C to 70°C
±0.07°C
No Isotech Equivalent
Thermocouples
Type R (5649) and Type S (5650) Thermocouple Standards
5649-20
0°C to 1450°C
±0.7°C at 1100°C
5650-20
5649-20C
1600 NCJ (DB2/37)
0°C to 1450°C
±0.7°C at 1100°C
5650-20C
5649-25
5650-25C
1600 (DB1/44)
1600 NCJ (DB2/37)
0°C to 1450°C
±0.7°C at 1100°C
5650-25
5649-25C
1600 (DB1/44)
1600 (DB1/44)
1600 NCJ (DB2/37)
0°C to 1450°C
±0.7°C at 1100°C
1600 (DB1/44)
1600 NCJ (DB2/37)
Temperature Calibration, Data Logging,
& ITS-90 Coefficient Calculation Software
Isotech Equivalent
(Databook/page)
INTERFACE-IT (Model 9930) Version 3.8 Cal Notepad
TABLEWARE (Model 9933) Version 2.4
PRTCalc
(Model 9934) Version 1.3
Cal Notepad
LOGWARE II (Model 9935) Version 1.1
Cal Notepad
LOGWARE
LOGWARE III (Model 9936) Version 1.2 Cal Notepad
MET/TEMP II (Model 9938) Version 4.3 I-Cal Easy
Compact Series
Model
Range
Stability
Depth
6330
35°C to
±0.005°C at
9.25"
300°C
100°C
234 mm
Isotech Equivalent (Databook/page)
Hydra 798EHT (DB2/11-13)
±0.015°C at
300°C
7320
–20°C to
±0.005°C at
9.25"
150°C
–20°C
234 mm
No Isotech Equivalent
±0.005°C at 25°C
7340
7380
–40°C to
±0.005°C at
150°C
–40°C
9.25"
±0.005°C at 25°C
234 mm
–80°C to
±0.006°C at
7"
100°C
–80°C
178 mm
Hydra 798M (DB2/11-13)
Hydra 798L (DB2/11-13)
±0.010°C at 0°C
7312
–5°C to
±0.001°C at 0°C
110°C
6331
19.5"
Hydra 798M plus 798-05-03
496 mm
40°C to
±0.007°C at
18"
300°C
100°C
457 mm
No Isotech Equivalent
±0.015°C at
300°C
7321
–20°C to
±0.005°C at
18"
150°C
–20°C
457 mm
No Isotech Equivalent
±0.005°C at 25°C
7341
–40°C to
±0.005°C at
18"
150°C
–40°C
457 mm
No Isotech Equivalent
±0.005°C at 25°C
7381
–80°C to
±0.006°C at
18"
110°C
–80°C
457 mm
No Isotech Equivalent
±0.005°C at 0°C
Standard Baths
Model
Range
Stability
Depth
7060
–60°C to
±0.0025°C at
12"
110°C
–60°C
305 mm
Isotech Equivalent (Databook/page)
915LW (DB2/7-10)
±0.0015°C at
25°C
7080
–80°C to
±0.0025°C at
12"
110°C
–80°C
305 mm
±0.0015°C at
798L (DB2/11-13)
25°C
7100
7008
7011
–100°C to
±0.003°C at
13.25"
110°C
–100°C
337 mm
–5°C to
±0.0007°C at
13"
110°C
25°C
331 mm
–10°C to
±0.0008°C at 0°C
12"
110°C
±0.0008°C at
305 mm
No Isotech Equivalent
455 (DB1/41)
798L (DB2/11-13)
25°C
7012
–10°C to
±0.0008°C at 0°C
18"
110°C
±0.0008°C at
457 mm
915MWE & 915/D (DB2/7-10)
25°C
7030
–30°C to
±0.006°C
150°C
7037
11"
No Isotech Equivalent
279 mm
–40°C to
±0.002°C at
18"
110°C
–40°C
457 mm
915MWE & 915/D (DB2/7-10)
±0.0015°C at
25°C
7040
–40°C to
±0.002°C at
12"
110°C
–40°C
305 mm
Hydra 798M (DB2/11-13)
±0.0015°C at
25°C
6020
40°C to
±0.001°C at 40°C
12"
300°C
±0.005°C at
305 mm
915H (DB2/7-10)
300°C
6022
40°C to
±0.001°C at 40°C
18.25"
300°C
±0.005°C at
464 mm
915H & 915/D (DB2/7-10)
300°C
6024
40°C to
±0.001°C at 40°C
13.25"
300°C
±0.005°C at
337 mm
820 (DB2/15)
300°C
6045
40°C to
±0.002°C at
12"
400°C
100°C
305 mm
875 (DB2/16-17)
±0.004°C at
400°C
6050H
40°C to
±0.002°C at 200°
12"
550°C
±0.007°C at
305 mm
500°C
875 (DB2/16-17)
Special
Isotech Equivalent
Model
Range
Stability
Depth
Application
(Databook/page)
6054
50°C to 300°C ±0.003°C at
100°C
24"
915H & 915/D (DB2/7-10)
610 mm
±0.005°C at
300°C
6055
200°C to
±0.003°C at
550°C
200°C
17"
875,875/6 & 875/8
432 mm
±0.01°C at
550°C
7007
–5°C to 110°C ±0.001°C at
24"
0°C
±0.003°C at
Large, 7-inch-diameter
working space.
610 mm
100°C
7009
0°C to 110°C
±0.0007°C at
13"
455 (DB1/41)
25°C
331 mm
7015
0°C to 110°C
±0.0007°C at
13"
455 (DB1/41)
25°C
331 mm
7108
20°C to 30°C
±0.004°C
8"
455 (DB1/41)
203 mm
7911A2
0°C
±0.002°C
8"
203 mm
813 (DB2/14)
Industrial Temperature Calibration Instruments
Metrology Wells Model
Range
Accuracy
Isotech Equivalent (Databook/page)
–45°C to 140°C
9170
±0.1°C
Europa-6 (DB3/16-17)
±0.1°C
Oceanus-6 (DB3/22-23)
(–49°F to 284°F)
–30°C to 155°C
9171
(–22°F to 311°F)
35°C to 425°C
9172
±0.1°C at 100°C
510 Medusa (DB3/38-39)
±0.2°C at 425°C
511 Medusa 3 (DB3/38-39)
(95°F to 797°F)
50°C to 700°C
9173
(122°F to 1292°F)
Micro-Baths
Model
Range
6102
35°C to 200°C
Accuracy
Isotech Equivalent (Databook/page)
±0.25°C
Hyperion 936 (DB3/10-11)
±0.25°C
No Isotech Equivalent
±0.25°C
Drago 934 (DB3/12-13)
Micro-Bath
95°F to 392°F
7102
–5°C to 125°C
Micro-Bath
23°F to 257°F
7103
Micro-Bath
–30°C to
125°C
–22°F to 257°F
Handheld
Model
Range
Accuracy
Isotech Equivalent (Databook/page)
9100S
35°C to 375°C
±0.25°C at 100°C HTQC (DB3/44-45)
Dry-Wells
Handheld
Dry-Well
9102S
Handheld
95°F to 707°F
±0.5°C at 375°C
–10°C to
±0.5°C
LTQC (DB3/44-45)
122°C
Dry-Well
14°F to 252°F
Field Dry-Wells
Model
Range
Accuracy
9009
–15°C to
Cold block: ±0.2°C
Dual-Block
350°C
Hot block: ±0.6°C
Calibrator
5°F to 662°F
Isotech Equivalent (Databook/page)
No Isotech Equivalent
9103
–25°C to
Field
140°C
±0.25°C
Fast-Cal Low (DB3/46-47)
±0.5°C
Fast-Cal Medium (DB3/46-47)
Fast-Cal High (DB3/46-47)
Dry-Well
–13°F to 284°F
9140
35°C to 350°C
Field
Dry-Well
95°F to 662°F
9141
50°C to 650°C
±0.5°C to 400°C
122°F to
±1°C to 650°C
Field
Dry-Well
1202°F
3125
35°C to 400°C
Surface
±0.5°C to 200°C
983 Small Hot Plate (DB3/48-49)
±1.0°C to 400°C
Calibrator
95°F to 752°F
Model
Range
Accuracy
Isotech Equivalent (Databook/page)
9132
50°C to 500°C
±0.5°C at 100°C
Gemini R 550 (DB4/5)
Infrared
Calibrators
122°F to 932°F ±0.8°C at 500°C
9133
–30°C to
±0.4°C
Hyperion R 982 (DB4/4)
±1°C
Model 975 (DB4/12)
150°C
–22°F to 302°F
9135
50°C, 100°C,
3-Pt. IR
150°C
Calibrator
122°F, 212°F,
302°F
Laboratory
Model
Range
Accuracy
Isotech Equivalent (Databook/page)
9101
0°C
±0.05°C
TRU 938 (DB4/17)
Dry-Wells
Zero Point
Dry-Well
32°F
TRU 937 (DB4/18)
9011
50°C to 67°C
±0.15°C at 100°C No Isotech Equivalent
122°F to
±0.65°C at 600°C
Hot Block
1238°F
Cold Block
–30°C to
±0.25°C (Insert
140°C
wells)
–22°F to
±0.65°C (Fixed
284°F
wells)
9007
–40°C to
Portable Lab
140°C
±0.15°C
Europa-6 (DB3/16-17)
Venus 2140 (DB3/18-19)
Dry-Well
–40°F to 284°F
9023
35°C to 650°C ±0.3°C to 350°C
Jupiter 650 (DB3/30-31)
Portable Lab
Dry-Well
95°F to
±0.5°C to 650°C
1202°F
Furnaces
Model
Range
Stability
Isotech Equivalent (Databook/page)
9150
150°C to
±0.5°C
Pegasus 1200 (DB3/36-37)
Thermocouple
1200°C
±0.1°C
Saturn 877 (DB2/18-19)
Furnace
302°F to
2192°F
9112A
300°C to
Calibration
1100°C
Furnace
572°F to
2012°F