Omega CYD201A Series User manual

Omega Model CYD201/202 User’s Manual
Table of Contents i
TABLE OF CONTENTS
Chapter/Paragraph Title Page
1 INTRODUCTION ..........................................................................1-1
1.0 General ..........................................................................1-1
1.1 Model CYD20X System Description...............................1-1
2 INSTALLATION ...........................................................................2-1
2.0 General ..........................................................................2-1
2.1 Inspection and Unpacking..............................................2-1
2.2 Repackaging For Shipment ...........................................2-1
2.3 Front and Rear Panel Definitions...................................2-2
2.3.1 Model CYD201 Definitions .........................................2-2
2.3.2 Model CYD202S Definitions .......................................2-4
2.3.3 Model CYD202D Definitions.......................................2-6
2.4 Sensor Installation Recommendations ..........................2-8
2.4.1 Two-Lead Measurement Considerations....................2-8
2.4.2 Connecting Leads To The Sensor..............................2-8
2.4.3 Sensor Mounting ........................................................2-9
2.4.4 Current Source Dependence....................................2-10
2.4.5 Measurement Errors Due To AC Noise....................2-11
2.5 Sensor Curve Definition ...............................................2-12
2.6 Power Connections ......................................................2-12
2.7 Panel Mounting ............................................................2-13
2.8 Initial Setup and Checkout Procedure .........................2-13
3 OPERATION ................................................................................3-1
3.0 General ..........................................................................3-1
3.1 Temperature Unit Selection ...........................................3-1
3.2 Diode Curve Selection ...................................................3-1
3.3 Blinking Decimal Point ...................................................3-1
3.4 Front Panel Operation....................................................3-2
4 SERVICE......................................................................................4-1
4.0 General ..........................................................................4-1
4.1 General Troubleshooting................................................4-1
4.2 Operating Software Replacement..................................4-1
4.3 PCB Description.............................................................4-3
4.4 Calibration......................................................................4-3
APPENDIX A – CURVE TABLE ........................................................ A-1

Omega Model CYD201/202 User’s Manual
ii Table of Contents
LIST OF ILLUSTRATIONS
Figure No. Title Page
1-1 Model CYD201, 202 Temperature Monitor Series ....................1-3
2-1 Model CYD201 Front Panel ......................................................2-2
2-2 Model CYD201 Rear Panel.......................................................2-3
2-3 Model CYD202S Front Panel....................................................2-4
2-4 Model CYD202S Rear Panel ....................................................2-5
2-5 Model CYD202D Front Panel....................................................2-6
2-6 Model CYD202D Rear Panel ....................................................2-7
4-1 Location of Fuse and Jumpers .................................................4-2
LIST OF TABLES
Table No. Title Page
1-1 Specifications............................................................................1-4
2-1 Effect of Current Variation on Diode Temperature..................2-10
2-2 Typical CY7 dV/dI Values for Selected Temps .......................2-11
A-1 CY7 Diode Standard Curve...................................................... A-1

Omega Model CYD201/202 User’s Manual
Introduction 1-1
CHAPTER 1
INTRODUCTION
1.0 GENERAL
The CYD201, CYD202Series is designed and manufactured in the United
States of America with these features:
• Bright 4-Digit LED Display of Temperature in K or °C
• Temperature Range: 1.4 K to 475 K (–271 °C to 202 °C)
• Resolution of ±0.1 K or °C
• Overall Accuracy with Calibrated Sensor of ±0.25 K
• Standard Temperature Response Curves, Plus Memory
for Precision Curve Option for a Calibrated Sensor
• Sensor Connections made to Screw Terminal Adapter
• Flexible Power Supply Requirement
We welcome comments on this manual. Although we try to keep it error-
free, some may occur. To report an error, describe it briefly and include the
appropriate paragraph, figure, table, and page number. This manual is
subject to change without notice.
1.1 MODEL CYD20X SYSTEM DESCRIPTION
The Model CYD201, CYD202 Temperature Monitors are a microcontroller-
based instrument which measures temperature. It is designed to use CY7
Silicon diode sensors. The Model CYD201 displays the temperature reading
of one diode sensor. The Model CYD202S has two inputs and one display.
The user selects the input to display by means of a front panel switch. The
diode sensors must conform to the same temperature response curve. The
Model CYD202D has two inputs and two displays. The readings of both
diode sensors continuously display. Each sensor can have its own
temperature response curve. See Figure 1-1.
The Model CYD201, CYD202 Temperature Monitors, coupled with the
CY7series diode sensors, offers outstanding performance and advantages
over traditional thermocouple solutions. In the cryogenic temperature range,
the diode sensor offers a much higher signal and better sensitivity,
repeatability, and accuracy than a thermocouple. The CY7 Series sensors
follow the same temperature response curve, Curve 10. In most applications
they are interchangeable with no need to reconfigure monitors.

Omega Model CYD201/202 User’s Manual
1-2 Introduction
Diode sensors come in several packaging formats for easy mounting. Unlike
a thermocouple, the lead wire in a diode measurement is not the active
sensor component; using an additional connector to bring out the sensor
signal from a cryogenic and/or vacuum system does not degrade the
measurement. Finally, the diode sensor does not require any room
temperature compensation.
These units excite the diode sensor with a 10 µA current source. An analog-
to-digital converter reads the sensor voltage and sends the reading to a
microcontroller. The microcontroller uses the selected temperature
response curve stored in memory to convert sensor voltage to temperature.
The computed temperature displays on the bright front panel LED display.
There are several standard temperature response curves.
Mounting the CYD201 is simple since it is packaged in a 1/8 DIN aluminum
panel mount box. The CYD202S and CYD202D Temperature Monitors are
packaged in 1/4 DIN aluminum panel mount boxes.

Omega Model CYD201/202 User’s Manual
Introduction 1-3
CYD201 Temperature MonitorCYD201 Temperature Monitor
°C°C
CYD202S Temperature MonitorCYD202S Temperature Monitor
KK
Sensor ASensor A Sensor BSensor B
°C°C
CYD202D Temperature MonitorCYD202D Temperature Monitor
KK
Channel A
Channel BChannel B
ModelModel
CYD201CYD201
ModelModel
CYD202SCYD202S
ModelModel
CYD202DCYD202D
OmegaOmega
OmegaOmega
OmegaOmega
C-200-1-1.eps
Figure 1-1. Temperature Monitor Series

Omega Model CYD201/202 User’s Manual
1-4 Introduction
Table 1-1. Specifications
THERMOMETRY
Input/Display: Model CYD201 One input, one display
Model CYD202S Two inputs, one display
Model CYD202D Two inputs, two displays
Measurement type: Two-lead
Sensor Type: Silicon Diode
Input Voltage Range: 5 Volts
Sensor Excitation: 10 µA ±0.2%
Temperature Range: 1.4–475 K
Electronic Accuracy with Silicon Diode Sensor:
±0.1 degree typical, ±0.2 degree maximum
Accuracy with Calibrated Sensor: ±0.25 K
Sensor Curves: Curve 10, D-Curve.
DISPLAY
Type: 4-Digit Red LED Display, 14.2 mm
(0.56 in.) high, and unit annunciators
Resolution: 0.1 K or °C
Units: K or °C
Update Rate: 3 updates per second
REAR PANEL CONNECTORS AND SWITCHES
Sensor Input: Screw terminal
Power Input: Power jack accepts power plug compatible to
Switchcraft S-760 or S-765 or screw terminal
Configuration Switch: 4-position DIP Switch to Select Curve and
Temperature Unit
GENERAL
Ambient Temperature Range: 15–35 °C
Power Requirements: 20–35 VDC or 15–24 VAC (50-60 Hz),
3.5 Watts (Maximum)
Size: Model CYD201 = 96 x 48 x 146 mm
(3.78 x 1.89 x 5.75 in.);
Model CYD202S & CYD202D =
96 x 96 x 146 mm (3.78 x 3.78 x 5.75 in.)
Panel Mount Cutout Dimensions:
Model CYD201 = 91 x 44 mm (3.58 x 1.72 in.);
Model CYD202S & CYD202D = 91 x 96 mm
(3.58 x 3.58 in.)

Omega Model CYD201/202 User’s Manual
Installation 2-1
CHAPTER 2
INSTALLATION
2.0 GENERAL
This chapter covers Inspection and Unpacking (Paragraph 2.1), Repackaging
for Shipment (Paragraph 2.2), Front and Rear Panel Definitions (Paragraph
2.3), Sensor Installation Recommendations (Paragraph 2.4), Sensor
Definitions (Paragraph 2.5), Power Connections (Paragraph 2.6), Panel
Mounting (Paragraph 2.7), and Initial Setup and Checkout (Paragraph 2.8)
2.1 INSPECTION AND UNPACKING
Inspect shipping containers for external damage. Make all claims for
damage (apparent or concealed) or partial loss of shipment in writing to
Omega Engineering within five (5) days from receipt of goods. If damage or
loss is apparent, please notify the shipping agent immediately.
Open the shipping containers. Use the packing list included with the system
to verify receipt of the instrument, sensor, accessories, and manual. Inspect
for damage. Inventory all components supplied before discarding any
shipping materials. If there is freight damage to the instrument, file proper
claims promptly with the carrier and insurance company and notify Omega
Engineering. Notify Omega immediately of any missing parts. Omega
cannot be responsible for any missing parts unless notified within 60 days of
shipment.
2.2 REPACKAGING FOR SHIPMENT
To return the unit or accessories for repair or replacement, obtain a Return
Authorization (RA) number from Customer Service in the United States.
Instruments may not be accepted without a RA number. When returning an
instrument for service, Omega must have the following information before
attempting any repair.
1. Instrument model and serial number.
2. User name, company, address, and phone number.
3. Malfunction symptoms.
4. Description of system.
5. Return Authorization (RA) number.
Repack the system in its original container (if available). Affix shipping
labels and FRAGILE warnings. Write RA number on the outside of the
container or on the packing slip. If not available, consult Omega for shipping
and packing instructions.

Omega Model CYD201/202 User’s Manual
2-2 Installation
2.3 FRONT AND REAR PANEL DEFINITIONS
This paragraph defines front and rear panels of the Model CYD201
(Paragraph 2.3.1), Model CYD202S (Paragraph 2.3.2), and Model
CYD202D (Paragraph 2.3.3).
2.3.1 Model CYD201 Definitions
The Model CYD201 has no front panel controls. The 4-digit red LED
displays the temperature in Kelvin (K) or degrees Celsius (°C). Select
temperature units with the rear panel DIP switch. See Figure 2-1.
CYD201 Temperature MonitorCYD201 Temperature Monitor
°C°C
OmegaOmega
C-200-2-1.eps
Figure 2-1. Model CYD201 Front Panel
The rear panel consists of the 24 Volt power input connector, DIP Switch,
CAL trimpot, and screw-terminal connector. See Figure 2-2.
24 Volt Power Input Connector. The line cord from the wall mounted
power supply has a power plug that inserts into the Model CYD201 rear
panel. The Model CYD201 is off when not plugged in, and on when plugged
in. Make sensor connections before applying power to the instrument.
DIP Switch. The DIP switch controls temperature display and curve
selection. The first switch, labeled K/C, selects Kelvin or degrees Celsius for
display. The next two switches select the proper sensor curve as shown in
the table below. The four curve types are defined in Paragraph 2.5. The
fourth switch is not used.
CURVE 1 CURVE 0 SETTING
OPEN
OPEN
CLOSE
CLOSE
OPEN
CLOSE
OPEN
CLOSE
CY7
CTI-Curve
D-Curve
Precision Option