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.
CY7-SD7
Economical Sensor
For applications where temperature
measurements below 10 K are not
required, the CY7-SD7 series offers
an inexpensive alternative to the other
CY7-SD series temperature sensor. The
upper operating temperature is limited
to 475 K for the CY7-SD7. Since the
package configuration of the CY7-SD7 is
identical to the CY7-SD, the installation
and operation of the device follow the
same procedures as the CY7-SD.
The CY7-SD7 follows Standard Curve
#10 (on previous page) to a tolerance
of ±1.5 K or 1.5% of temperature,
whichever is greater. Due to possible
irregularities and non-monotonic
behavior below 10 K, extrapolations or
interpolations outside of the operating
temperature range should not be
attempted.
OMEGA also offers platinum resistance devices and thermocouples
for low temperature sensors. For additional information please
contact our Cryogenic Applications Engineers at 1-800-TC-OMEGA.
Clean Room Assembly Keeps Out Contaminants
All CY7 sensors are meticulously assembled in semiconductor
grade clean rooms on state-of-the-art bonding equipment. Special
effort is made to keep them free of epoxies, polyimides, fluxes,
chlorine, and other contaminants which have a detrimental effect
on sensor performance.
Choose the Sensor Style That Best Fits Your
Application and Level of Interchangeability You Want
It’s easy to pick the CY7 sensor you should use. OMEGA starts with
the same basic sensor style and offers it unmounted or in a variety
of mounting adapters that will simplify installation in your system.
Choose from a simple cylinder that slides into a mounting hole,
metric or SAE threaded stud mounts, or bolt-on flat mounts.
Probes, thermowells and other mounts can be special ordered.
All CY7 sensors follow the temperature response curve shown in
standard curve #10. Five bands of tracking accuracy (#1, 2, 3, 4,
and 7) are offered to allow sensor selection to be suited to both the
technical and economical considerations of any application. Low
temperature accuracy ranges from ±0.25 K for the tightest band (#1)
to ±1.5 K for the loosest (#7).
See accuracy table in “To Order” chart below.
Cryogenic Temperature Sensors
*
Insert probe configuration type from chart above.
Ordering Examples: CY7-DI4, cryogenic sensor, $299.
CY7-SD7, cryogenic sensor, $140.
Probe Maximum
Configuration Add’l. Temperature Installation
Type* Price Range Temperature Range
-SD N/C 1.4 to 475 K 200°C (392°F)
-ET $25 1.4 to 325 K 60°C (140°F)
-BO 50 1.4 to 325 K 60°C (140°F)
-CU 60 1.4 to 325 K 60°C (140°F)
-LR 25 1.4 to 325 K 60°C (140°F)
-MT 25 1.4 to 325 K 60°C (140°F)
-CO 25 1.4 to 475 K 200°C (392°F)
-CY 70 1.4 to 325 K 60°C (140°F)
Cathode (-)
Anode (+)
Leads: 0.38 W x 0.10 T x 12.7 L (0.01 x 0.004 x 0.5)
Sensor Mass: 0.03 g (0.001 oz)
3.2 (0.125)
2.16 (0.09)
1.84 (0.075)
0.98 (0.04)
1.4 (0.055)
SD Sensor
Cathode(-)
3.2 (0.125)
3.1 (0.122)
dia.
12 (0.5) typ
Leads: 0.38 W x 0.10 T x 12.7 L (0.01 x 0.004 x 0.5)
Basic sensor soldered into cylindrical copper adaptor.
Temperature range: 1.4 K to 325 K. Mass: 0.15 g (0.005 oz)
Anode(+)
Sensor
CY7-LR
CY7-SD
Accuracy Band Availability
1
2
3
4
7
Accuracy Band Availability
1
2
3
4
_
*
All of the above are valid for accuracy bands, 1, 2, 3 and 4, except ‘-CY’ which
cannot be manufactured with Band 1.
T-5
Dimensions: mm (in)
MOST POPULAR MODELS HIGHLIGHTED!
To Order
(Specify Model Number)
Base Band Suffix Accuracy (Tolerance)
Model No. Price (Range) 2 K-100 K 100 K-305 K 305 K-475 K
CY7-(*)2 $334 2 ±0.5 K ±1.0 K ±2.0 K
CY7-(*)3 260 3 ±0.5 K ±1% of T ±1% of T
CY7-(*)4 235
4 ±1 K ±1% of T ±1% of T
CY7-DI4 299
CY7-SD7 140 7 ±1.5 K ±1.5% of T ±1.5% of T
MOST POPULAR MODELS HIGHLIGHTED!
Specifications
Sensing Element: Silicon diode
Temperature Range, CY7-SD or CY7-CO:
1.4 to 475 K (10 to 425 K for CY7-SD7)
Temperature Range, Other Configurations: 1.4 to 325 K
Recommended Excitation Current: 10 microamperes
(±0.05% to meet listed specifications)
Temperature response curve: See figure for standards
interchangeability curve (curve #10); nominal output at
recommended current is 1.7V at 1.4 K, 0.1 V at 475 K.
Repeatability (at 4.2 K): Typically ± 10 millikelvin
over multiple thermal cycles
Thermal Time Constants (Typical, CY7-SD):
10 ms at 4.2 K, 100 ms at 77 K, 200 ms at 305 K
Accuracy, Interchangeability: Sensors track above
standard interchangeability curve (curve #10) within
the tolerance bands
Temperature Offset, Vacuum to Liquid at 4.2 K:
Typically 5 to 35 millikelvin depending on configuration
Magnetic Field Use: Not recommended
Maximum Recommended Storage Temperature:
60°C (140°F)
Maximum Installation Temperature,
CY7-SD or CY7-CO: 200°C (392°F)
Maximum Installation Temperature,
Other Configurations: 60°C (140°F)
CY7-SD Construction: Sapphire base with alumina
body and lid; molybdenum/manganese metallization
on base bottom and lid top with nickel and gold plating,
150 µin thick; gold-tin solder as lid seal; hermeticity: less
than 1 x 10
-8
std cc/s; cavity size: < 1 mm
3
Leads: Gold plated Kovar, uninsulated;
0.38 W x 0.01 T x 12.7 mm L (0.01 x 0.004 x 0.5"); Designed
to withstand at least five right angle bends; polarity-positive
lead on right with package lid up and leads toward user
Configuration Adaptors: Gold plated OFHC copper except
for CO adaptor which is brass with steel spring
Sensor
Cathode (-)
5.5 (0.218)
across flats
6 (0.240)
Leads: 0.38 W x 0.10 T x 12.7 L (0.01 x 0.004 x 0.5)
Basic sensor soldered onto SAE-threaded copper adaptor.
Temperature range: 1.4 K to 325 K. Mass: 1.4 g (0.05 oz)
Anode (+)
6 (0.240)
#6-32 threaded
stud
Sensor
Cathode (-)
5.44 (0.2)
across flats
6 (0.2)
Leads: 0.38 W x 0.10 T x 12.7 L (0.01 x 0.004 x 0.5)
Anode (+)
6 (0.2)
M3 x 0.5
threaded stud
Basic sensor soldered into metric-threaded copper adaptor.
Temperature range: 1.4 K to 325 K. Mass: 1.4 g (0.05 oz)
5.1 (0.2) thick
914 (36) long leads
14.3 (0.564)
diameter
2.9 (0.113) hole centered
Basic sensor epoxied into relatively large copper disk. 30 AWG
stranded copper lead pair is thermally anchored to disk.
Temperature range: 1.4 K to 325 K. Mass (excl. leads): 4.3 g (0.15 oz)
8.9 (0.35)
7.6 (0.3)
5.3 (0.21)
3.2 (0.125)
2.95 (0.116)
hole centered
SD Sensor
Beryllium-Oxide
Thermal Link
Basic sensor soldered onto bolt-on copper block with leads
thermally anchored to block.
Temperature range: 1.4 K to 325 K. Mass: 1.5 g (0.05 oz)
Sensor
Cathode
Anode
5.1 (0.2)
7.9 (0.312)
3.2 (0.125)
#4-40 shoulder screw
extends 6.9 (0.27) above clamp
Basic sensor with spring-loaded brass clamp to hold sensor to sample.
Temperature range: 1.4 K to 475 K. Mass (w/o sensor): 1.7 g (0.06 oz)
All models shown larger than actual size.
Cryogenic Temperature Sensors
Probe Configuration and Dimension Charts
CY7-ET
CY7-BO
CY7-MT
CY7-CO
CY7-CY
Accuracy Band Availability
1
2
3
4
_
Accuracy Band Availability
1
2
3
4
_
Accuracy Band Availability
1
2
3
4
_
Accuracy Band Availability
1
2
3
4
_
Accuracy Band Availability
–
2
3
4
–
T-6
T
3.8 (0.15) thick
Basic sensor mounted into bold-on disk with leads thermally
anchored to disk with low temperature epoxy.
CU version is 4-leaded. DI is 2-leaded.
Temperature range: 1.4 K to 325 K. Mass (excl. leads) 1.0 g (0.04 oz)
8 (0.313)
diameter
2.9 (0.113) hole diameter,
0.76 (0.03) off center
Leads 914 (36) long, 36 AWG
CY7-CU
4-Leads
Accuracy Band Availability
1
2
3
4
_
CY7-DI4
2-Leads
Dimensions: mm (in)
One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | info@omega.com
EPG05
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