The CY7 Series sensors from
OMEGA represent the first truly
new cryogenic sensor technology
introduced in the last decade. The
sensors incorporate uniform sensing
elements that exhibit precise,
repeatable, monotonic temperature
response over a wide range. The
elements are mounted into rugged,
hermetically sealed packages that
have been specifically designed for
proper behavior in a cryogenic
environment.The result is a family
of sensors with temperature
responses so predictable, tightly
CY7-SD7, $140, shown
larger than actual size
T-3
Average
Slope
-2.3mV/K
Average
Slope
-26mV/K
1.8
1.6
1. 4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
20
40 60
80
100
200
300
400
Temperature, K (Kelvin)
Standard Temperature Response (Curve 10) for CY7 Series Sensors.
All Sensors Track this Curve Within Specified Tolerance Bands.
Forward Voltage –– V
f
(Volts)
0
10
20
30
40 50
60
70
Cryogenic
Temperature Sensors
Silicon Diodes
Covered by U.S. and
International patents and
pending applications
PATENTED
grouped, and stable that the
sensors can be routinely
interchanged with one another.
A New Silicon Diode Chip
The key to the sensor’s temperature
response lies with the basic sensing
element itself. The small silicon chip
in each sensor has a temperature
characteristic that is so stable, so
predictable, and conforms so well
from chip to chip, that the CY7’s
sensors are the first mass
produced, interchangeable
cryogenic sensors.
A Sensor Package Designed
for Cryogenics
Sensors for higher temperatures fall
far short for cryogenic use. The
complex thermal link between the
sensing element and its entire
environment must be taken into
account, as does the effect of
any measurement induced selfheating of the sensor itself, to
achieve accurate results. In
addition, the package must
also withstand repeated cycling
to low temperatures without
mechanical failure.
CY7 Series
Starts at
$
140
Standard Curve #10 for CY7 Silicon Diodes
Measurement Current = 10µA ±0.05%
T Voltage dV/dT T Voltage dV/dT T Voltage dV/dT
(K) (mV/K) (K) (mV/K) (K) (mV/K)
1.40 1.69812 -13.1 16.0 1.28527 -18.6 95.0 0.98564 -2.02
1.60 1.69521 -15.9 16.5 1.27607 -18.2 100. 0.97550 -2.04
1.80 1.69177 -18.4 17.0 1.26702 -18.0 110. 0.95487 -2.08
2.00 1.68786 -20.7 17.5 1.25810 -17.7 120. 0.93383 -2.12
2.20 1.68352 -22.7 18.0 1.24928 -17.6 130. 0.91243 -2.16
2.40 1.67880 -24.4 18.5 1.24053 -17.4 140. 0.89072 -2.19
2.60 1.67376 -25.9 19.0 1.23184 -17.4 150. 0.86873 -2.21
2.80 1.66845 -27.1 19.5 1.22314 -17.4 160. 0.84650 -2.24
3.00 1.66292 -28.1 20.0 1.21440 -17.6 170. 0.82404 -2.26
3.20 1.65721 -29.0 21.0 1.19645 -18.5 180. 0.80138 -2.28
3.40 1.65134 -29.8 22.0 1.17705 -20.6 190. 0.77855 -2.29
3.60 1.64529 -30.7 23.0 1.15558 -21.7 200. 0.75554 -2.31
3.80 1.63905 -31.6 24.0 1.13598 -15.9 210. 0.73238 -2.32
4.00 1.63263 -32.7 25.0 1.12463 -7.72 220. 0.70908 -2.34
4.20 1.62602 -33.6 26.0 1.11896 -4.34 230. 0.68564 -2.35
4.40 1.61920 -34.6 27.0 1.11517 -3.34 240. 0.66208 -2.36
4.60 1.61220 -35.4 28.0 1.11212 -2.82 250. 0.63841 -2.37
4.80 1.60506 -36.0 29.0 1.10945 -2.53 260. 0.61465 -2.38
5.00 1.59782 -36.5 30.0 1.10702 -2.34 270. 0.59080 -2.39
5.50 1.57928 -37.6 32.0 1.10263 -2.08 280. 0.56690 -2.39
6.00 1.56027 -38.4 34.0 1.09864 -1.92 290. 0.54294 -2.40
6.50 1.54097 -38.7 36.0 1.09490 -1.83 300. 0.51892 -2.40
7.00 1.52166 -38.4 38.0 1.09131 -1.77 310. 0.49484 -2.41
7.50 1.50272 -37.3 40.0 1.08781 -1.74 320. 0.47069 -2.42
8.00 1.48443 -35.8 42.0 1.08436 -1.72 330. 0.44647 -2.42
8.50 1.46700 -34.0 44.0 1.08093 -1.72 340. 0.42221 -2.43
9.00 1.45048 -32.1 46.0 1.07748 -1.73 350. 0.39783 -2.44
9.50 1.43488 -30.3 48.0 1.07402 -1.74 360. 0.37337 -2.45
10.0 1.42013 -28.7 50.0 1.07053 -1.75 370. 0.34881 -2.46
10.5 1.40615 -27.2 52.0 1.06700 -1.77 380. 0.32416 -2.47
11.0 1.39287 -25.9 54.0 1.06346 -1.78 390. 0.29941 -2.48
11.5 1.38021 -24.8 56.0 1.05988 -1.79 400. 0.27456 -2.49
12.0 1.36809 -23.7 58.0 1.05629 -1.80 410. 0.24963 -2.50
12.5 1.35647 -22.8 60.0 1.05267 -1.81 420. 0.22463 -2.50
13.0 1.34530 -21.9 65.0 1.04353 -1.84 430. 0.19961 -2.50
13.5 1.33453 -21.2 70.0 1.03425 -1.87 440. 0.17464 -2.49
14.0 1.32412 -20.5 75.0 1.02482 -1.91 450. 0.14985 -2.46
14.5 1.31403 -19.9 80.0 1.01525 -1.93 460. 0.12547 -2.41
15.0 1.30422 -19.4 85.0 1.00552 -1.96 470. 0.10191 -2.30
15.5 1.29464 -18.9 90.0 0.99565 -1.99 475. 0.09062 -2.22
Cryogenic Temperature Sensors
Temperature
Model No. Price Description Range
OB-CY20-2 $235 Low temperature epoxy for mounting sensor, twenty 2 g packets
(approx. 0.1 oz. each)
CYIF 140 5 pieces of Indium foil, high thermal conductivity, highly malleable,
used as a mechanical alternative to CYAG grease to mount a sensor.
[0.127 mm thick x 50 x 50 mm square (0.005 thick x 2 x 2")]
CYAV 115 Adhesive varnish for tacking sensor extension leads [1 pt can (0.6 liter)]
CYCO 360 Clamps with springs for CY7-CO sensors (package of 10)
CYAG 335 General purpose thermal grease, used between sensor
1.4 to 316 K
and surface [25 g tube (approx. 1 oz)]
1.4 K
to
330 K
Accessories
For Mounting CY7 Series Silicon Diode Sensors
T-4
T
MOST POPULAR MODELS HIGHLIGHTED!
Ordering Examples: OB-CY20-2, low temperature epoxy for mounting sensor, $235.
CYAG, general purpose thermal grease, $335.
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