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OMEGA Model CYD201/CYD208 User’s Manual
Installation 2-5
For temporary mounting in cold temperature applications, apply a thin layer
of Apiezon
®
N Grease between the sensor and sample to enhance thermal
contact under slight pressure. The preferred method for mounting the
CY-7-SD sensor is the OMEGA CO Adapter.
CAUTION: OMEGA will not warranty replace any device damaged by
user-designed clamps or solder mounting.
For semi-permanent mountings, use Stycast epoxy instead of Apiezon
®
N
Grease.
NOTE:
Do not apply Stycast epoxy over the CY-7-SD package:
sensor stress may shift the readings. In all cases, periodically inspect the
sensor mounting to verify good thermal contact to the mounting surface is
maintained.
2.4.4 Measurement Errors Due To AC Noise
Poorly shielded leads or improperly grounded measurement systems can
introduce AC noise into the sensor leads. In diode sensors, the AC noise
shifts the DC voltage measurement due to the diode non-linear
current/voltage characteristics. When this occurs, measured DC voltage is
too low and the corresponding temperature reading is high. The
measurement error can approach several tenths of a kelvin.
To determine if
this problem exists, perform either procedure below.
1. Place a capacitor across the diode to shunt induced AC currents.
Capacitor size depends on the noise frequency. If noise is related to
power line frequency, use a 10 µF capacitor. If AC-coupled digital noise
is suspected (digital circuits or interfaces), use a 0.1 to 1 µF capacitor. In
either case, if measured DC voltage increases, there is induced noise in
the measurement system.
2. Measure AC voltage across the diode with an AC voltmeter or
oscilloscope. Most voltmeters do not have the frequency response to
measure noise associated with digital circuits or interfaces (which
operate in the MHz range). For a thorough discussion of this potential
problem, and the magnitude of error which may result, request the paper
“Measurement System-Induced Errors In Diode Thermometry,” J.K.
Krause and B.C. Dodrill, Rev. Sci. Instr. 57 (4), 661, April, 1986.
To greatly reduce potential AC noise, connect twisted leads (pairs) between
the measurement instruments and the diode sensors. Use 32 or 36 AWG
OMEGA Duo-Twist™ Cryogenic Wire, which features phosphor bronze wire
twisted at 3.15 twists per centimeter (8 twists per inch). See the OMEGA
Product Catalog or contact OMEGA for further information.
- 1
- 1
- RETURN REQUESTS / INQUIRIES 2
- WARRANTY 2
- TABLE OF CONTENTS 3
- TABLE OF CONTENTS (Continued) 4
- LIST OF ILLUSTRATIONS 5
- LIST OF TABLES 5
- CHAPTER 1 7
- INTRODUCTION 7
- 1.2.2 LHe and LN 9
- Safety Precautions 9
- 1.2.3 Recommended First Aid 10
- CHAPTER 2 13
- INSTALLATION 13
- 2.4.1.1 Two-Lead Measurement 15
- 2.4.1.2 Four-Lead Measurement 15
- 2.4.3 Sensor Mounting 16
- 2-10 Installation 22
- CHAPTER 3 23
- OPERATION 23
- 3.5.1 Alarm Setpoint 24
- 3-6 Operation 28
- CHAPTER 4 29
- REMOTE OPERATION 29
- 4-2 Remote Operation 30
- J2 SERIAL I/O 30
- 4.1.3 Sample Basic Program 31
- R Alarm Reset 33
- Y Channel Dwell Time 33
- YC Channel Scanner Channel 34
- YH End Scanning 34
- YS Begin Scanning 34
- WA Switch ID and Alarm Data 34
- WY Scan Status 35
- 4-8 Remote Operation 36
- CHAPTER 5 37
- Service 5-7 43
- 5-8 Service 44
- CHAPTER 6 45
- OPTIONS AND ACCESSORIES 45
- Interface Output 47
- CYD201 or 47
- 6-4 Options and Accessories 48
- APPENDIX A 49
- CURVE TABLES 49
- Appendix A A-3 51
- Appendix A A-5 53
- Appendix A A-7 55
- (Continued) 56
- NOTES 57
- TEMPERATURE 59
- PRESSURE/STRAIN 59
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