OMEGA warrants this unit to be free of defects in materials and workmanship and to give
satisfactory service for a period of 13 months from date of purchase. OMEGA Warranty adds an
additional one (1) month grace period to the normal one (1) year product warranty to cover handling
and shipping time. This ensures that our Customers receive maximum coverage on each product. If
the unit should malfunction, it must be returned to the factory for evaluation. Our Customer Service
Department will issue an Authorized Return (AR) Number immediately upon phone or written
request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or
replaced at no charge. However, this WARRANTY is VOID if the unit shows evidence of having
been tampered with or shows evidence of being damaged as a result of excessive current, heat,
moisture, vibration, or misuse. Components which wear or which are damaged by misuse are not
warranted. These include contact points, fuses, and triacs.
THERE ARE NOT WARRANTIES EXCEPT AS STATED HEREIN. THERE ARE NO OTHER
WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND OF F ITNESS FOR A PARTICULAR PURPOSE. IN
NO EVENT SHALL OMEGA ENGINEERING, INC. BE LIABLE FOR CONSEQUENTIAL,
INCIDENTAL, OR SPECIAL DAMAGES. THE BUYER'S SOLE REMEDY FOR ANY BREACH OF
THIS AGREEMENT BY OMEGA ENGINEERING, INC. , OR ANY BREACH OF ANY WARRANTY
BY OMEGA ENGINEERING, INC., SHALL NOT EX CEED THE PURCHASE PRICE PAID BY THE
PURCHASE TO OMEGA ENGINEERING, INC. FOR THE UNIT OR UNITS OR EQUIPMENT
DIRECTLY AFFECTED BY SUCH BREACH.
RETURN REQUESTS / INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
Call toll free in the USA and Canada: 1-800-622-2378; FAX: 203-359-7811.
International:
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA,
(AR) NUMBER FROM OUR CUSTOMER SERVICE DEPARTMENT IN ORDER TO AVOID
PROCESSING DELAYS
return package and on any correspondence.
FOR WARRANTY RETURNS:
OMEGA:
1. P.O. Number under which the product was PURCHASED.
2. Model and serial number of the product under warranty.
3. Repair instruction and/or specific problems you are having with the product.
FOR NON-WARRANTY REPA IRS OR CALIB4RATIONS:
repair/calibration charges. Have the following information BEFORE contacting OMEGA:
1. Your P.O. Number to cover COST of the repair/calibration..
2. Model and serial number of the product under warranty.
3. Repair instruction and/or specific problems you are having with the product.
Every precaution for accuracy has been taken in the preparation of this manual, however, OMEGA
ENGINEERING, INC. neither assumes responsibility for any omissions or errors that may appear
nor assumes liability for any damages that result from the use of the products in accordance with
the information contained in the manual.
OMEGA policy is to make running changes, not model changes, whenever an improvement is
possible. That way, our Customers get the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
203-359-1660; FAX; 203-359-7806.
OBTAIN AN AUTHORIZED RETURN
. The assigned AR number should then be marked on the outside of the
Please have the following information available BEFORE contacting
This chapter covers a general description of the Model CYD201/CYD208
(Paragraph 1.1), Handling Liquid Helium and Liquid Nitrogen (Paragraph 1.2),
Electrostatic Discharge (Paragraph 1.3), Safety Summary (Paragraph 1.4),
and Safety Symbols (Paragraph 1.5).
Due to the OMEGA commitment to continuous product improvement,
modifications may occur to the Model CYD201/CYD208 software with time.
Some of these changes result from Customer feedback about operation on
various cryogenic systems. We encourage comments or suggestions
regarding this instrument. Please return the instrument warranty card to
ensure receipt of future software updates.
1.1MODEL CYD201/CYD208 GENERAL DESCRIPTION
Model CYD201/CYD208 Digital Thermometers are ideal to monitor critical
temperatures in chemical and materials research, superconductivity
measurements, and low temperature physics. The units feature:
• Broad Temperature Range: 1.4 K to 475 K (–272 °C to 202 °C).
• Single Channel (CYD201) and Eight Channel (CYD208) Models.
• For use with CY-7 Series, DT-500 Series, and other Silicon Diode
Sensors.
• System Accuracy (Instrument with Sensor) with SoftCal™ to within
±0.1 °C or better.
• Temperature display in °C, °F, K, or Sensor Voltage.
• High/Low Alarm Setpoint with Interfacing Alarm Contacts.
• Standard RS-232C Output of Temperature, Input of Settings, and
Alarm Status for Remote Operation.
Introduction1-1
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OMEGA Model CYD201/CYD208 User’s Manual
Table 1-1. Model CYD201/CYD208 Specifications
Display:
Resolution:
Four-digit LED display
0.1 for values > 100 or < –100
0.01 for values between -100<T<100
Temperature Range:
1.4 K to 475 K without probe
23 K to 473 K with probe
System Accuracy:
To within ±0.1K from 177 K to 313 K.
To ±0.2 K or better from 30 K to 373 K.
±1.0 K above 373 K.
Standard Curve 10, DT-500DI-8A
(also -8B and -8C), DT-500DRC-D,
DT-500DRC-E1, and CTI Curve C.
* SOFTCAL™ qualified only for CY-7 Series diode sensors.
COMPUTER INTERFACE
Type:
RS-232C Serial Three Wire (Refer to Table 4-1).
MECHANICAL
Ambient Temperature Range:
18 to 28 °C (64 to 82 °F),
or 15 to 35 °C (59 to 95 °F) with reduced accuracy.
Power Requirements:
Dimensions:
Weight:
41 x 106 x 164 mm (1.61 x 4.18 x 6.45 inches).
0.5 kilogram (1.1 Pounds)
90-125 or 210-250 VAC, 50/60 Hz, 3 watts.
NOTES
Product Specifications subject to c hange without notice.
1.
System electronic temperature accurac y in a gi ven temperature range is the
2.
sum of the specifications given for input and out put. Sensor calibration errors
are not included.
1-2Introduction
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OMEGA Model CYD201/CYD208 User’s Manual
1.2HANDLING LIQUID HELIUM AND LIQUID NITROGEN
Helium and Nitrogen are colorless, odorless, and tasteless gases. They
liquefy when properly cooled. Liquid helium (LHe) and liquid nitrogen (LN
)
2
may be used in conjunction with the Model CYD201 or CYD208. Although
not explosive, there are certain safety considerations in the handling of LHe
and LN
.
2
1.2.1Handling Cryogenic Storage Dewars
Operate all cryogenic containers (dewars) in
accordance with manufacturer instructions. Safety
instructions are normally posted on the side of
each dewar. Keep cryogenic dewars in a wellventilated place, protected from the weather, and
away from heat sources. Figure 1-1 shows a
typical cryogenic dewar.
1.2.2LHe and LN2 Safety Precautions
Transfer LHe and LN2 and operate storage dewar
controls in accordance with manufacturer/supplier
instructions. During transfer, follow all safety
precautions written on the storage dewar and
recommended by the manufacturer.
WARNING
•Liquid helium is a potential asphyxiant and can cause rapid
suffocation without warning. Store and use in an adequately
ventilated area. DO NOT vent the container in confined spaces. DO
NOT enter confined spaces where gas may be present unless area
is well-ventilated. If inhaled, remove to fresh air. If not breathing,
give artificial respiration. If breathing is difficult, give oxygen. Get
medical attention.
•Liquid helium can cause severe frostbite to exposed body parts. DO
NOT touch frosted pipes or valves. For frostbite, consult a
physician immediately. If a physician is unavailable, warm the
affected parts with water that is near body temperature.
Two essential safety aspects of handling LHe are adequate ventilation and
eye and skin protection. Although helium and nitrogen gases are non-toxic,
they are dangerous because they replace air in a normal breathing
atmosphere. Liquid helium is an even greater threat because a small
amount of liquid evaporates to create a large amount of gas. Store and
operate cryogenic dewars in open, well-ventilated areas.
Figure 1-1. Typical
NON-
MAGNETIC
NON-
LIQUID
FLAMMABLE
HELIUM
KEEP
UPRIGHT
Cryogenic Dewar
Introduction1-3
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OMEGA Model CYD201/CYD208 User’s Manual
When transferring LHe and LN2, protect eyes and skin from accidental
contact with liquid or the cold gas issuing from it. Protect eyes with full face
shield or chemical splash goggles; safety glasses (even with side shields)
are inadequate. Always wear special cryogenic gloves (Tempshield
Cryo-Gloves
®
or equivalent) when handling anything that is, or may have
been, in contact with the liquid or cold gas, or with cold pipes or equipment.
Wear long sleeve shirts and cuffless trousers long enough to prevent liquid
from entering shoes.
1.2.3Recommended First Aid
Post an appropriate Material Safety Data Sheet (MSDS) obtained from the
manufacturer/distributor at every site that stores and uses LHe and LN
MSDS specifies symptoms of overexposure and first aid.
If a person exhibits symptoms of asphyxia such as headache, drowsiness,
dizziness, excitation, excessive salivation, vomiting, or unconsciousness,
remove to fresh air. If breathing is difficult, give oxygen. If breathing stops,
give artificial respiration. Call a physician immediately.
If exposure to cryogenic liquids or cold gases occurs, restore tissue to
normal body temperature (98.6°F) by bathing it in warm water not exceeding
105 °F (40 °C). DO NOT rub the frozen part, either before or after
rewarming. Protect the injured tissue from further damage and infection and
call a physician immediately. Flush exposed eyes thoroughly with warm
water for at least 15 minutes. In case of massive exposure, remove clothing
while showering with warm water. The patient should not drink alcohol or
smoke. Keep warm and rest. Call a physician immediately.
. The
2
1.3ELECTROSTATIC DISCHARGE
Electrostatic Discharge (ESD) may damage electronic parts, assemblies,
and equipment. ESD is a transfer of electrostatic charge between bodies at
different electrostatic potentials caused by direct contact or induced by an
electrostatic field. The low-energy source that most commonly destroys
Electrostatic Discharge Sensitive (ESDS) devices is the human body, which
generates and retains static electricity. Simply walking across a carpet in
low humidity may generate up to 35,000 volts of static electricity.
Current technology trends toward greater complexity, increased packaging
density, and thinner dielectrics between active elements, which results in
electronic devices with even more ESD sensitivity. Some electronic parts
are more ESDS than others. ESD levels of only a few hundred volts may
damage electronic components such as semiconductors, thick and thin film
resistors, and piezoelectric crystals during testing, handling, repair, or
assembly. Discharge voltages below 4000 volts cannot be seen, felt, or
heard.
1-4Introduction
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OMEGA Model CYD201/CYD208 User’s Manual
1.3.1Identifying ESDS Components
Below are some industry symbols used to label components as ESDS:
1.3.2Handling ESDS Components
Observe all precautions necessary to prevent damage to ESDS components
before installation. Bring the device and everything that contacts it to ground
potential by providing a conductive surface and discharge paths. At a
minimum, observe these precautions:
1.
De-energize or disconnect all power and signal sources and loads used
with unit.
2.
Place unit on a grounded conductive work surface.
3.
Ground technician through a conductive wrist strap (or other device)
using 1 M series resistor to protect operator.
4.
Ground any tools, such as soldering equipment, that will contact unit.
Contact with operator's hands provides a sufficient ground for tools that
are otherwise electrically isolated.
5.
Place ESDS devices and assemblies removed from a unit on a
conductive work surface or in a conductive container. An operator
inserting or removing a device or assembly from a container must
maintain contact with a conductive portion of the container. Use only
plastic bags approved for storage of ESD material.
6.
Do not handle ESDS devices unnecessarily or remove from the
packages until actually used or tested.
1.4SAFETY SUMMARY
Observe these general safety precautions during all phases of instrument
operation, service, and repair. Failure to comply with these precautions or
with specific warnings elsewhere in this manual violates safety standards of
design, manufacture, and intended instrument use. OMEGA assumes no
liability for Customer failure to comply with these requirements.
Ground The Instrument
To minimize shock hazard, connect instrument chassis and cabinet to an
electrical ground. The instrument comes with a 3-conductor AC power
cable. Plug it into an approved three-contact electrical outlet or use a threecontact adapter with the green ground wire firmly secured to an electrical
ground (safety ground) at the power outlet. The power cable jack and
mating plug meet Underwriters Laboratories (UL) and International
Electrotechnical Commission (IEC) safety standards.
Introduction1-5
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OMEGA Model CYD201/CYD208 User’s Manual
tY
Do Not Operate In An Explosive Atmosphere
Do not operate the instrument in the presence of flammable gases or fumes.
Operation of any electrical instrument in such an environment constitutes a
definite safety hazard.
Keep Away From Live Circuits
Operating personnel must not remove instrument covers. Refer component
replacement and internal adjustments to qualified maintenance personnel.
Do not replace components with power cable connected. To avoid injuries,
always disconnect power and discharge circuits before touching them.
Do Not Substitute Parts Or Modify Instrument
Do not install substitute parts or perform any unauthorized modification to
the instrument. Return the instrument to an authorized OMEGA Cryotronics,
Inc. representative for service and repair to ensure that safety features are
maintained.
1.5SAFETY SYMBOLS
Direct current (power line).
Alternating current (power line).
Alternating or direct current (power line).
Three-phase alternating current (power line).
Earth (ground) terminal.
Protective conductor terminal.
Frame or chassis terminal.
On (supply)
Off (supply)
Equipment protected throughout by double insulation or
reinforced insulation (equivalent to Class II of IEC 536 - see
annex H).
Caution: High voltages or temperatures. Background color:
Yellow; Symbol and outline: Black.
Caution or Warning - See instrument documentation.
Background color: Yellow; Symbol and outline: Black.
1-6Introduction
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OMEGA Model CYD201/CYD208 User’s Manual
CHAPTER 2
INSTALLATION
2.0GENERAL
This chapter covers Inspection and Unpacking (Paragraph 2.1),
Repackaging for Shipment (Paragraph 2.2), Sensor Installation
Recommendations (Paragraph 2.3) Power and Ground Requirements
(Paragraph 2.4), Sensor Curve Definitions (Paragraph 2.5), and Rack
Mounting (Paragraph 2.6).
2.1INSPECTION AND UNPACKING
Remove packing list and verify receipt of all equipment. For question
about the shipment, please call OMEGA Customer Service Department at
1-800-622-2378 or (203) 359-1660.
Upon receipt, inspect container and equipment for damage. Note
particularly any evidence of freight damage. Immediately report any damage
to the shipping agent
NOTE:
saved for their examination. After examining and removing contents, save
packing material and carton in the event reshipment is necessary.
2.2REPACKAGING FOR SHIPMENT
To return the Model CYD201/CYD208, sensor, or accessories for repair or
replacement, obtain a Authorized Return (AR) number from Technical
Service in the United States, or from the authorized sales/service
representative from which the product was purchased. Instruments may not
be accepted without a RGA 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.Authorized Return (AR) number.
Repack the system in its original container (if available). Write AR number
on the outside of the container or on the packing slip. If not available,
consult OMEGA for shipping and packing instructions.
The carrier will not honor any claims unless all shipping material is
Installation2-1
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OMEGA Model CYD201/CYD208 User’s Manual
2.3POWER AND GROUND REQUIREMENTS
The Model CYD201/CYD208 requires a power source of 90 to 125 or 210 to
250 VAC, 50 or 60 Hz, single phase, 3 Watts. Three-prong detachable
power cord for 120 VAC operation included. Connect to rear panel
UL/IEC/ICEE standard plug. See Table 2-1 for fuse rating.
WARNING: To prevent electrical fire or shock hazards, do not expose
this instrument to rain or excess moisture.
CAUTION: Verify proper fuse installation and AC Line Voltage Selection
Wheel on the Model CYD201/CYD208 rear panel set to available AC line
voltage before inserting power cord and turning on the instrument.
Refer to Chapter 5 to change voltage configuration.
NOTE:
Do not attach the shield to earth ground at the sensor end. It may
introduce noise at the measurement end.
Table 2-1. Line Voltage and Fuse Rating Selection
SelectRangeFuse
115
230
To protect operating personnel, the National Electrical Manufacturer’s
Association (NEMA) recommends, and some local codes require, grounded
instrument panels and cabinets. The 3-conductor power cable, when
plugged into an appropriate receptacle, grounds the instrument.
Grounding and shielding signal lines are major concerns when setting up
any precision instrument or system. The CYD201/CYD208 includes ground
isolation of sensor excitation to allow 4-wire measurement of diode voltage
and resistance. Improperly grounding sensor leads and shields can defeat
this feature.
Model CYD201/CYD208 digital logic ties directly to earth ground for
interface communication. The low side of the heater output connects directly
to earth ground. Shield sensor cables whenever possible. Attach the shields
to the connector shield pin.
90 – 125 VAC
210 – 250 VAC
0.2 A (Slow Blow)
0.1 A (Slow Blow)
2.4SENSOR INSTALLATION RECOMMENDATIONS
See the OMEGA Product Catalog for sensor installation and specifications.
Call OMEGA for copies of application notes or sensor installation questions.
Below are general recommendations on sensor installation:
1. Do not ground the sensor.
2. Shield leads and connect shield wire to SHIELD on screw terminal
connector only. Do not connect shield at other end of cable.
2-2Installation
Page 15
OMEGA Model CYD201/CYD208 User’s Manual
3. Keep leads as short as possible.
4. Use twisted-pair wire. Use Duo-Twist™ wire (or equivalent) for two-wire,
or Quad-Twist™ wire (or equivalent) for four-wire applications.
5. Thermally anchor lead wires.
2.4.1Two-Lead Vs Four-Lead Measurements
In two-lead measurement, the leads that measure sensor voltage also carry
the current. The voltage measured at the instrument is the sum of the
temperature sensor voltage and the IR voltage drop within the two current
leads. Since heat flow down the leads can be critical in a cryogenic
environment, wire of small diameter and significant resistance per foot is
preferred to minimize this heat flow. Consequently, a voltage drop within the
leads may exist.
Four-lead measurement confines current to one pair of leads and measures
sensor voltage with the other lead pair carrying no current.
2.4.1.1Two-Lead Measurement
Sometimes system constraints dictate
two-lead measurement. Connect the
positive terminals (V+ and I+) together
and the negative terminals (V– and I–)
together at the instrument, then run
Two-Lead
Measurements
two leads to the sensor.
Expect some loss in accuracy; the
voltage measured at the voltmeter equals the sum of the sensor voltage and
the voltage drop across the connecting leads. The exact measurement error
depends on sensor sensitivity and variations resulting from changing
temperature. For example, a 10 lead resistance results in a 0.1 mV
voltage error. The resultant temperature error at liquid helium temperature is
only 3 mK, but, because of the lower sensitivity (dV/dT) of the diode at
higher temperatures, it becomes 10 mK at liquid nitrogen temperature.
I+
V+
V–
I–
2.4.1.2Four-Lead Measurement
All sensors, both two-lead and four-lead devices,
can be measured in a four-lead configuration to
eliminate the effects of lead resistance. The exact
point at which the connecting leads solder to the
Four-Lead
Diode
two-lead sensor normally results in a negligible
temperature uncertainty.
Installation2-3
I+
V+
V–
I–
Page 16
OMEGA Model CYD201/CYD208 User’s Manual
2.4.2Connecting Leads To The Sensor
Excessive heat flow through connecting leads to any temperature sensor
may differ the temperature between the active sensing element and the
sample to which the sensor mounts. This reflects as a real temperature
offset between what is measured and the true sample temperature.
Eliminate such temperature errors with proper selection and installation of
connecting leads.
To minimize heat flow through the leads, select leads of small diameter and
low thermal conductivity. Phosphor-bronze or Manganin wire is commonly
used in sizes 32 or 36 AWG. These wires have a fairly low thermal
conductivity, yet electrical resistance is not large enough to create
measurement problems.
Thermally anchor lead wires at several temperatures between room
temperature and cryogenic temperatures to guarantee no heat conduction
through the leads to the sensor.
2.4.3Sensor Mounting
Before installing a diode sensor, identify
which lead is the anode and which is the
cathode. When viewed with the base down
and the leads towards the observer, the
anode is on the right and the cathode is on
the left. The OMEGA CY-7-SD silicon diode
sensor lead configuration is shown to the
right. For other sensors, read accompanying
literature or consult the manufacturer to
Cathode
positively identify sensor leads. Lead identification should remain clear even
after sensor installation. Record the sensor serial number and location.
On the CY-7-SD, the base is the largest flat surface. It is sapphire with gold
metalization over a nickel buffer layer. The base is electrically isolated from
the sensing element and leads; make all thermal contact to the sensor
through the base. A thin braze joint around the sides of the SD package
electrically connect to the sensing element. Avoid contact to the sides with
any electrically conductive material.
When installing the sensor, make sure there are no electrical shorts or
current leakage paths between the leads or between the leads and ground.
If IMI-7031 varnish or epoxy is used, it may soften varnish-type lead
insulations so that high resistance shunts appear between wires if
time for curing is not allowed
Slide Teflon
®
spaghetti tubing over bare leads when the possibility of
.
shorting exists. Avoid putting stress on the device leads and allow for
thermal contractions that occur during cooling which could fracture a solder
joint or lead if installed under tension at room temperature.
DT-470-SD
Diode Sensor Leads
Anode
sufficient
2-4Installation
Page 17
OMEGA Model CYD201/CYD208 User’s Manual
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
Grease.
NOTE:
Do not apply Stycast epoxy over the CY-7-SD package:
N
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.
2.4.4Measurement 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.
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.
To determine if
Installation2-5
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OMEGA Model CYD201/CYD208 User’s Manual
2.5SENSOR INPUT CONNECTIONS
The Model CYD201 has one rear panel 4-pin sensor input connector
designated J1 INPUT 1. The connector pins, numbered 1 thru 4, are shown
below.
J1 INPUT 1
4
3
Figure 2-1. Model CYD201 Sensor Connector J1 Details
The Model CYD208 has a 36-pin “Miniature-D” style connector designated
J1 INPUTS for inputs 1 thru 8. A Model CYD208-D connector is included to
solder interfacing connections to J1. The pin configuration of the Model
CYD208-D is shown below.
Figure 2-2. Model CYD208-D Sensor Connector Details
1
2
TerminalD
4+ Current Out
1– Current Out
2– Voltage Sense
3+ Voltage Sense
CASEShield
123456789101112131415
1920212223242526272829303132333435
TerminalDescription
escription
161718
36
2-6Installation
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OMEGA Model CYD201/CYD208 User’s Manual
2.6SENSOR CURVE DEFINITION
To display accurate temperature, select a response curve that matches the
installed sensor. There are seven standard curves stored within the Model
CYD201/CYD208 numbered 0 through 6 (see Appendix A). Different curves
may be assigned to each channel of the Model CYD208. Find the unit
factory curve configuration inside the front cover of this manual. Curve 6
(CY-7 Curve 10) is the standard curve configuration unless specified
differently upon order.
To determine current curve selection, press and hold
the rear panel SET switch (DIP switch 3). Release
displays the curve number in the display window. The Model CYD208
displays the curve number in the display window and the channel number in
the channel window. To display curves for other channel numbers in the
Model CYD208, press
To change the curve, press
through 6. In the Model CYD208, press
then press
After the new curve selection, turn the SET switch on the rear panel off (0).
The unit returns to normal operation.
UNITS
Table 2-2. Model CYD201/CYD208 Temperature Curves
Curve No.Range (K)Description
CHANNEL
to scroll through the curves.
to scroll through the eight channels.
UNITS
. The instrument scrolls through curves 0
CHANNEL
UNITS
UNITS
to select other channels,
and turn on (1)
key. The CYD201
0
1
2
3
4
5
6
2.7RACK MOUNTING
The Models CYD201 and CYD208 can install in a standard “size” 1/4 panel
EIA rack space. If you ordered a CYD208-DIN rack mounting adapter, follow
the installation instructions below. See Figure 2-3.
1. Remove front feet on bottom of unit and attach lower rack piece by
threading two of the four screws provided into the front feet holes.
2. Locate the two mounting hole access covers on the top of the unit.
Attach the other rack with the remaining screws.
A = 0.189 (0.480) Diameter - 4 Places
B = 0.169 (0.429) Diameter - 2 Places
Model CYD201 or CYD208 Front Panel
0.215 (5.46)
A
1.25
(31.75)
ABA
1.44
(35.58)
Figure 2-3. Model CYD208-DIN Rack Mounting
2-8Installation
C
L
4.18 (106.17)
1.44
(35.58)
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OMEGA Model CYD201/CYD208 User’s Manual
2.8INITIAL POWER UP SEQUENCE
The test sequence below occurs at power up.
1. All display segments light.
2. The unit displays “-201-” or “-208-”.
3. The instrument begins normal operation. Units currently selected flash.
Model CYD208s also indicate the current channel selected.
2.9POWER UP ERRORS
On power up, the CYD201/CYD208 checks internal memory. If a problem
exists, an error message displays on the front panel of the instrument.
Er01
“
” indicates a hardware problem in the instrument memory. This error is
not user-correctable. First perform the procedure in Paragraph 5.3. If
unsuccessful, then call the factory.
Er02
“
” indicates a soft error in the instrument memory. To correct this error,
close dip switch 1 on the rear panel for at least 5 seconds, then open it.
Follow the calibration procedure described in Paragraph 5.3 after an error 2
reset.
“OL” indicates a voltage input overload. This can be caused by an open
sensor or diode sensor wired backwards.
Installation2-9
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OMEGA Model CYD201/CYD208 User’s Manual
This Page Intentionally Left Blank
2-10Installation
Page 23
OMEGA Model CYD201/CYD208 User’s Manual
CHAPTER 3
OPERATION
3.0GENERAL
This chapter covers the Units Key (Paragraph 3.1), the Channel key
(Paragraph 3.2), Scan Mode (Paragraph 3.3), Setting Dwell Times
(Paragraph 3.4), Alarm Operation (Paragraph 3.5), SoftCal™
Compensations (Paragraph 3.6), Calibration (Paragraph 3.7), Verifying
SoftCal™ Operation (Paragraph 3.8), and Erasing SoftCal™
Compensations (Paragraph 3.9).
KV°C
UNITS
°F
ON
OFF
Figure 3-1. Model CYD201 Front Panel
KV°C
CYD201 THERMOMETER
UNITS
°F
CHANNEL
ON
OFF
Figure 3-2. Model CYD208 Front Panel
3.1UNITS KEY
UNITS selects different units of measurement. The thermometer reads in
voltage or temperature (°C, °F, or K). Press
various selections.
UNITS
also determines if SoftCal™ is active. Press and hold
3 seconds. If SoftCal™ is not active, -000- appears in the display.
CYD208 THERMOMETER
UNITS
to scroll through the
UNITS
for
Operation3-1
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OMEGA Model CYD201/CYD208 User’s Manual
3.2CHANNEL KEY (Model CYD208 Only)
CHANNEL
scrolls through the eight possible sensor channels.
It also
determines if scan mode is activated. Hold 1 to 2 seconds to toggle scan
mode On or Off. A red light glows in the upper left channel display if scan
mode is active.
3.3SCAN MODE (Model CYD208 Only)
The thermometer can scan 8 channels or monitor 1 channel. To enable
scan mode, press
CHANNEL
for 1 to 2 seconds to toggle scan mode On or
Off. If a light appears in upper left of channel display window, then scan
mode is On. If the light does not appear, the thermometer is in singlechannel mode. Repeat action to reverse mode.
3.4SETTING DWELL TIMES (Model CYD208 Only)
Set the time the thermometer pauses on each channel (dwell) for 5, 10, 30,
or 60 seconds. A dwell time of 0 instructs the thermometer to skip that
particular channel. To set the dwell:
1. Hold
2. While still pressing
CHANNEL
for 3 seconds. Do not release.
CHANNEL
, use
UNITS
to select the desired time;
0 (skip), 5, 10, 30, or 60 seconds.
3. Repeat procedure for each desired channel. Default channel dwell is
5 seconds.
3.5ALARM OPERATION
This section covers Alarm Setpoint (Paragraph 3.5.1), Latched and
Unlatched Alarms (Paragraph 3.5.2.), and the Alarm Fix Function
(Paragraph 3.5.3).
3.5.1Alarm Setpoint
The alarm setpoint is a temperature which activates the alarm relay. Set it to
warn of temperatures rising above (high alarm) or falling below (low alarm) a
certain point.
NOTE:
Alarm setpoints work for temperatures, not voltage. If in voltage
mode while setting an alarm setpoint, the thermometer defaults to kelvin for
the alarm setpoint.
To display the alarm setpoint, move the SET switch on the rear panel to
position 1. To change the setpoint:
1. Make sure the SET switch is in position 1.
3-2Operation
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OMEGA Model CYD201/CYD208 User’s Manual
2. Hold
3. Release UNITS when the desired setpoint displays. For a Model
4. Move the SET switch back to position 0 to enable the alarm. When it
The alarm can be connected to another device which triggers when the
alarm activates. The 3-contact terminal block is present on the rear panel as
J3 ALARM. The alarm contacts are designated 1 COM 2 with 1 representing
the normally open state and 2 representing the normally closed state.
UNITS
it is released and pressed again, the temperature direction reverses. If
the temperature display increases, the alarm is a high setpoint. If the
temperature display decreases, the alarm is a low setpoint.
CYD208, press
window and repeat the steps above to set the alarm for each channel
triggers, an alarm status light appears in the upper left of the
temperature display.
until the desired temperature displays.
CHANNEL
to display the desired channel in the channel
UNITS
is a toggle; if
3.5.2Latched And Unlatched Alarms
Alarms are either latched or unlatched. The alarm is latched when the
LATCH switch is in position 1: the alarm turns On when triggered by the
alarm setpoint, but will
returns to within the high and low setpoint range. The alarm is unlatched
when the LATCH switch is in position 0; the alarm turns On when triggered
by the alarm setpoint, and automatically turns Off when temperatures return
to within the high and low setpoint range.
not
automatically turn Off when the temperature
3.5.3Alarm Fix Function (Model CYD208 Only)
Set the FIX switch on the Model CYD208 rear panel to OFF (position 0) to
continuously update the alarm relay, depending on the alarm setpoint and
sensor temperature. If the FIX switch is ON (position 1), the relay updates
only when channel 1 input is active.
3.6SOFTCAL™ COMPENSATIONS
SoftCal™ is a simple, instrument-configured software calibration that
improves system accuracy over a specified temperature range. It reduces
the error between a CY-7 diode and the Standard Curve 10 used by the
instrument. In short, SoftCal™ generates inexpensive calibrations for CY-7
sensors used with OMEGA temperature controllers and monitors.
Operation3-3
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OMEGA Model CYD201/CYD208 User’s Manual
SoftCal™ calibrations are made at three temperature points: liquid helium
(4.2 K), liquid nitrogen (about 77 K), and 305 K. Below is the accuracy* of
the CY-7-SD-13 sensor:
+0.5 K2 K to <30 K+
+0.25 K30 K to <60 K+1.0 K375 K to 475 K
+0.15 K60 K to <345 K
* These values generally apply to all silicon diode sensors. Only two-point
SoftCal™ calibrations appropriate for CY-7 series Band 11, 11A sensors.
This section covers the SoftCal™ Calibration Procedure (Paragraph 3.6.1),
Verifying SoftCal™ Operation (Paragraph 3.6.2), and Erasing SoftCal™
Compensations (Paragraph 3.6.3).
0.25 K345 K to <375 K
3.6.1SoftCal™ Calibration Procedure
1. Turn on thermometer 30 minutes prior to operation.
2. Place the SET switch in position 1.
3. Hold
4. Press
5. Hold
6. Verify sensor stabilization at calibration temperature.
7. Press
8. To enter more than one point, go back to step 5.
9. Return the SET switch to position 0.
UNITS
acts as a toggle. If the display rises, release and press again.
"-SOF-" to indicate the unit is ready to erase the current SoftCal™
calibration. Within 2 seconds press
display changes from "-SOF-" to the current SoftCal™ setting.
setting SoftCal™ for liquid helium, the display reads 4.2 K. If setting for
ice point, the display reads 0 °C.
ready to accept the calibration point. Within 2 seconds, press
enter a new calibration point. (If
the display returns to the alarm temperature). After 15 seconds, the
alarm setpoint temperature displays.
be entered between 1.4 K to 9.9 K. No point may be entered between
10 K and 40 K. Two points may be entered above 40 K.
until 0 kelvin (or equivalent in °C or °F) displays. The key
CAL ENABLE
UNITS
until the sensor temperature displays. For example, if
CAL ENABLE
on rear panel with a pen tip. The display reads
UNITS
again. The temperature
again. "-SOF-" again displays to indicate the unit is
UNITS
is not pressed within 2 seconds,
NOTE:
UNITS
to
One point may
3-4Operation
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OMEGA Model CYD201/CYD208 User’s Manual
3.6.2Verifying SoftCal™ Operation
Check the status of SoftCal™ by holding
SoftCal™ is not in operation, "-000-" displays.
If the first digit of the display is 1, SoftCal™ is set for below 28 K. If either
the second or third digit is 1, SoftCal™ is set for above 28 K.
UNITS
for 2-3 seconds. If
3.6.3Erasing SoftCal™ Compensations
When SoftCal™ compensations are erased, the thermometer returns to
normal operation.
1. Move the SET switch to position 1.
2. Hold
3. Press
4. Move the SET switch to position 0.
UNITS
display moves in the wrong direction, release and press again.
from 0 to "-SOF-". The alarm setpoint displays after erasing SoftCal™
compensation.
until the front panel displays 0. This key is a toggle. If the
CAL ENABLE
on rear panel using a pen tip. The display changes
Operation3-5
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3-6Operation
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OMEGA Model CYD201/CYD208 User’s Manual
CHAPTER 4
REMOTE OPERATION
4.0GENERAL
The Model CYD201/CYD208 Digital Thermometer Serial Interface can be
used for both operation and service. This chapter covers the Serial Interface
(Paragraph 4.1) and Serial Interface Commands (Paragraph 4.2).
4.1SERIAL INTERFACE
The Model CYD201/CYD208 has a serial interface for RS-232C
communications with a host computer. RS-232C is an unbalanced (single
ended), non-terminated line used over short distances (typically 10 feet or
less). The Model CYD201/CYD208 serial interface complies with the
electrical format of the RS-232C Interface Standard. The serial interface
connector is a standard 6 wire RJ-11 modular (telephone) jack.
This section covers Serial Interface Specifications (Table 4-1), Serial
Interface Connections (Paragraph 4.1.1), Serial Interface Hardware
Configuration and Adapters (Figures 4-1 & 4-2), Serial Interface Operation
(Paragraph 4.1.2), and Sample Basic and QuickBasic Programs
(Paragraphs 4.1.3 & 4.1.4 respectively).
Table 4-1. Serial Interface Specifications
Transmission:
Connector:
Timing Format:
Transmission Mode:
Baud Rate:
Bits per Character:
Parity Type:
Data Interface Levels:
Terminator:
The serial interface connector is a standard 6 wire RJ-11 modular
(telephone) jack. OMEGA Model CYD200-J10 data cables, which maintain
pin 1 polarity, simplify interconnection. OMEGA offers the Model CYD200-D
RJ-11 to DB-25 adapter and Model CYD200-B RJ-11 to DE-9 adapter to
connect to the host computer. See Figure 4-2.
Remote Operation4-1
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OMEGA Model CYD201/CYD208 User’s Manual
J2 SERIAL I/O
PINDESCRIPTION
1
654321
RS-232C In (RxD)
2
RS-232C In (RxD)
3
RS-232C Ground
4
RS-232C Ground
5
RS-232C Out (TxD)
6
RS-232C Out (TxD)
Figure 4-1. Serial I/O (RJ-11) Connector Pin Definitions
Model CYD200-B RJ-11
to DB-2 5 Adapt er
RS-232C
Interface Output
on rear of Model
CYD201 or
CYD208
To Customer Supplied Computer
DB-25 Serial Interface Connector
Mode l CYD200-B
RJ-11 to DE-9 Adapter
DB-9 Serial Interface Connector
To Cust ome r Supp lie d Compute r
Use whichever adapter that
matches your computer
serial interface connector
RJ-11 Cable Assembly
J2 SERIAL I/O
Model CYD200-J10
Figure 4-2. Serial Interface Connections
4-2Remote Operation
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OMEGA Model CYD201/CYD208 User’s Manual
4.1.2Serial Interface Operation
Remotely control all thermometer functions, except SoftCal™
compensations from a computer with communications software and modem.
Located on the rear panel is a RJ-11 modular socket designated J2 SERIAL
I/O for host computer connection. Accessories CYD200-J10 (RS-232C
phone cord) and CYD200-D (RJ-11 to DB-25 adapter), as well as a null
modem adapter may be required to link the serial port of the host computer
directly to the thermometer. When programming a Model CYD201/CYD208
from the serial interface, consider the following:
• Type commands in all CAPS.
• The term
appropriate place in the string of digits.
[term]
•
where they appear on a returning character string from the unit.
• Leading zeros and zeros following a decimal point are not needed in a
command string, but they are sent in response to a query.
• Enter temperature to 0.1 degrees. Greater precision truncates.
Temperature is limited from 0 to 475 K.
• Place no space between commands and the variable being sent.
free field
in examples indicates terminating characters placed by the user or
indicates a floating decimal point placed any
4.1.3Sample Basic Program
10 OPEN “COM1:300,O,7,1,RS” AS #1 ‘Open COM port
11 PRINT “TYPE ‘QUIT’ TO EXIT”‘Print QUIT message
12 PRINT‘Print blank line
20 INPUT “ENTER COMMAND”;A$‘Get command to send
21 IF A$ = “QUIT” THEN GOTO 100‘Look for QUIT then quit
30 A$ = A$ +CHR$(13)+CHR$(10)‘Adding CR and LF
40 PRINT #1,A$;‘Sending command string
45 R = INSTR(A$,”W”)‘Scan CMD for W/QUERRY
46 IF R = 0 THEN GOTO 90‘If not a QUERRY skip PRINT
50 FOR Z = 1 TO 500: NEXT Z‘Short delay
60 LINE INPUT#1,B$‘Read back CYD201/CYD208 response
70 PRINT B$;‘PRINT instrument response
90 GOTO 11‘Jump back to the beginning
100 CLOSE #1‘Close COM port
101 END‘End program
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OMEGA Model CYD201/CYD208 User’s Manual
4.1.4Sample Quick Basic 4.0 Program
STARTUP: OPEN “COM1:300,O,7,1,RS” FOR RANDOM AS #1
PRINT “TYPE ‘QUIT’ TO EXIT”‘print ‘QUIT’ message
RESTART: PRINT‘print blank line
INPUT “ENTER COMMAND”; A$‘get command to send
IF A$ = “QUIT” THEN GOTO FINISH ‘check for quit request
A$ = A$ + CHR$(13) + CHR$(10)‘adding CR and LF
PRINT #1, A$;‘sending command string
R = INSTR(A$, “W”)‘scan for W/query
IF R = 0 THEN GOTO REJUMP‘if not query skip pri nt
FOR Z = 1 TO 500: NEXT Z‘short delay
LINE INPUT #1, B$‘read back CYD201/CYD208 response
PRINT B$;‘print instrument response
REJUMP:GOTO RESTART‘jump back to beginning
FINISH:CLOSE #1‘close serial port
RReset AlarmYSScan Enable *
WASwitch ID & Alarm Dat a QueryWYScan and Dwell Query *
WSSensor Reading & Alarm Status Query
* Model CYD208 Only.
‘open the serial port
Below is an explanation of the command list structure.
Command Name
Syntax of user input.
Information returned in
response to query.
Explanation of
returned data.
Brief Description of Function
Alarm Reset.
R
Nothing
Used to reset
R
Input:
Returned:
Remarks:
the alarm.
4-4Remote Operation
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OMEGA Model CYD201/CYD208 User’s Manual
F0Sets Sensor Units for Temperature Display.
Input:
Returned:
Remarks:
F0x
Nothing
Sets sensor units for the temperature display, where
x
= C (Celsius), F (Fahrenheit), K (kelvin), or V (volts).
HSelect High Alarm Setpoint Value.
Input:
Returned:
Remarks:
Example: H300[term]
Hxxx.x
Nothing
Sets high alarm setpoint, where
in units specified by F0 command. If the instrument is set for
volts, the alarm defaults to kelvin.
sets a high alarm setpoint of 300 degrees.
xxx.x
= temperature setpoint
LSelect Low Alarm Setpoint Value.
Input:
Returned:
Remarks:
Example: L31.2[term]
Lxxx.x
Nothing
Sets low alarm setpoint, where
in units specified by F0 command. If the instrument is set for
volts, the alarm defaults to kelvin.
sets a low alarm setpoint of 31.2 degrees.
xxx.x
= temperature setpoint
RAlarm Reset.
Input:
Returned:
Remarks:
R
Nothing
Resets the alarm.
YChannel Dwell Time
Input:
Returned:
Remarks:
Example: Y23[term]
Remote Operation4-5
Yab
Nothing
Sets dwell time for a given channel, where a = channel 1 - 8,
and b = the dwell time parameter as follows:
0
= zero seconds, 1 = 5 seconds, 2 = 10 seconds,
3
= 30 seconds, 4 = 60 seconds
Setting a dwell time of 0 skips the specified channel in the
sequence.
sets the dwell time for channel 2 to 30 seconds.
(Model CYD208 Only)
.
Page 34
OMEGA Model CYD201/CYD208 User’s Manual
YCChannel Scanner Channel
Input:
Returned:
Remarks:
YHEnd Scanning
Input:
Returned:
Remarks:
YSBegin Scanning
Input:
Returned:
Remarks:
YCx
Nothing
Asynchronously selects a scanner channel for readout
independent of scan feature, where x = channel 1 - 8.
(Model CYD208 Only)
YH
Nothing
Halts input scan at current input channel. Place scanner on
hold when sending any other commands to scanner or
unpredictable results may occur.
(Model CYD208 Only)
YS
Nothing
Starts input scan from current input channel. The instrument
skips every channel with a dwell time of zero.
WASwitch ID and Alarm Data.
Input:
Returned:
Remarks:
WA
For a Model CYD201, returns:
[switch ID],[high or low alarm],[alarm sign],[alarm
setpoint](CR)(LF)
For a Model CYD208, returns:
[switch ID],[high or low alarm],[alarm sign],[alarm
setpoint],[active channel number](CR)(LF)
Provides the switch ID and alarm data. The switch ID
parameter is 0 through 3 for the Model CYD201. It is the sum
of 1 if the alarm set enable is set, plus 2 if relay latching is
desired. The switch ID parameter is 0 through 7 for the Model
CYD208. It is the sum of 1 if the alarm set enable is set, plus
2 if relay latching is desired, plus 4 if the alarm fix is enabled.
High or Low Parameter: H = high alarm, L = low alarm.
Returns instrument scan status (scanning or holding),
channel dwell information, and scan position. Scan Status
Parameter: H = holding, S = scanning. Channel Which
Caused the Alarm State Parameter = 1 through 8 or "-" if
alarm is inactive. Channel dwell times are in seconds.
Sending this command with a Model CYD201 returns N to
signify no scanner.
(Model CYD208 Only)
.
Remote Operation4-7
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4-8Remote Operation
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OMEGA Model CYD201/CYD208 User’s Manual
CHAPTER 5
SERVICE
5.0GENERAL
This chapter covers Model CYD201/CYD208 maintenance: Model CYD201
Rear Panel Connections (Paragraph 5.1), Model CYD208 Rear Panel
Connections (Paragraph 5.2), Error Code Troubleshooting (Paragraph 5.3),
General Maintenance (Paragraph 5.4), Fuse Replacement (Paragraph 5.5),
Line Voltage Selection (Paragraph 5.6), Calibration (Paragraph 5.7), and
Serial Interface Cable and Adapters (Paragraph 5.8).
5.1MODEL CYD201 REAR PANEL CONNECTIONS
Figure 5-1. Model CYD201 Rear Panel Connections
J1 INPUT 1
J2 SERIAL I/O
computer. May require accessories CYD200-J10 (RJ-11 phone cord) and
CYD200-D (RJ-11 to DB-25 adapter).
J3 ALARM
device. Contact 1 is normally open, contact 2 is normally closed.
Switch
LATCH
indicated by temperature change. When off (position 0), turns alarm off or
on (unlatched).
SET
CAL ENABLE
Calibration. See Paragraph 5.7.2.
I ADJ
Calibration. See Paragraph 5.7.1.
Service5-1
: Accepts circular 4-pin connector temperature sensor (201-MC).
: RJ-11 jack for serial remote communications to a host
: Relay responds to alarm setpoints and can trigger another
: Not used.
switch: When on (position 1), turns alarm on but not off (latched) as
switch: Used in setting alarm setpoints and recalibration.
(Calibration Enable) pushbutton: Used during A/D Converter
(Current Adjust) trim potentiometer: Used during Current Source
Page 38
OMEGA Model CYD201/CYD208 User’s Manual
5.2MODEL CYD208 REAR PANEL CONNECTIONS
Figure 5-2. Model CYD208 Rear Panel Connections
J1 INPUTS
adapters. Adapter sits on top of thermometer and accepts up to 8
temperature sensors. Adapter designed for either circular 4-pin (2084) or
stripped wire (2081) sensors.
J2 SERIAL I/O
computer. May require accessories CYD200-J10 (RS-232C phone cord)
and CYD200-D (RJ-11 to DB-25 adapter).
J3 ALARM
device. Contact 1 is normally open, contact 2 is normally closed.
FIX
switch: Switches alarm functions between monitoring all channels
(position 0) or monitoring channel 1 only (position 1).
LATCH
indicated by temperature change. When off (position 0), turns alarm off or
on (unlatched).
SET
CAL ENABLE
Calibration. See Paragraph 5.7.2.
I ADJ
Calibration. See Paragraph 5.7.1.
: Accepts 36-pin “D” style connector (208-MC) and multi-sensor
: RJ-11 jack for serial remote communications to a host
: Relay responds to alarm setpoints and can trigger another
switch: When on (position 1), turns alarm on but not off (latched) as
switch: Used in setting alarm setpoints and recalibration.
(Calibration Enable) pushbutton: Used during A/D Converter
(Current Adjust) trim potentiometer: Used during Current Source
5-2Service
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OMEGA Model CYD201/CYD208 User’s Manual
5.3ERROR CODE TROUBLESHOOTING
On power up, the CYD201/CYD208 checks internal memory. If a problem
exists, an error message displays on the front panel of the instrument.
Er01
indicates a hardware problem in the instrument memory. This error is
not user-correctable.
Er02
indicates a soft error in the instrument memory. To correct this error,
use the following procedure.
1. Power up the unit and allow it to display Er02.
2. Close DIP Switch 1 (top of the switch pressed in). Leave the switch
closed for at least 5 seconds, then open DIP switch 1 (bottom of the
switch pressed in).
3. Verify the Model CYD201/CYD208 display goes through a normal power
up sequence and then displays 499.9 K.
4. The input(s) of the Model CYD201/CYD208 must now be recalibrated
per in procedure in Paragraph 5.7 before the unit can be used.
OL
indicates a voltage input overload. This can be caused by an open
sensor or diode sensor wired backwards.
Before calling the factory about a persistent problem, try the procedure
below:
WARNING: This procedure erases calibration constants stored in NonVolatile RAM. If this procedure is used, recalibrate the instrument.
1. With power turned Off, press and hold
While holding
2. If the Model CYD201/CYD208 displays
procedure in Paragraph 5.7. If
CYD201/CYD208 does not respond, contact OMEGA Service.
CAL ENABLE
, turn instrument power On.
Er01
CAL ENABLE
Er02
still displays or if the Model
, follow the Calibration
on the back panel.
5.4GENERAL MAINTENANCE
Clean the CYD201/CYD208 periodically to remove dust, grease and other
contaminants. Clean the front and back panels and case with a soft cloth
dampened with a mild detergent and water solution.
NOTE:
Do not use aromatic hydrocarbons or chlorinated solvents to clean
the Model CYD201/CYD208. They may react with the silk screen printing on
the back panel.
Service5-3
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5.5FUSE REPLACEMENT
WARNING: To prevent shock hazard, turn off instrument and
disconnect it from AC line power and all test equipment before
replacing fuse.
1. Turn POWER switch Off and disconnect power cord from unit.
Disconnect all test equipment from unit.
2. Remove all screws from rear panel. Gently pull away rear panel and
remove enclosure cover by sliding it to the back.
3. Remove fuse with a fuse puller. The fuse is located behind the
transformer as shown in Figure 5.3.
4. Replace with a 0.2 A fuse for 110 V (115 VAC) operation or a 0.1 A fuse
for 220 V (230 VAC) operation. Use slow blow fuses.
CAUTION: Replace fuse with the same type and rating as specified by
the line voltage selected.
5. Replace enclosure cover, rear panel, and all screws.
5.6Line Voltage Configuration
The rear-panel, 3-pronged line power connector permits Model
CYD201/CYD208 operation at either 110 or 220 VAC. The configuration is
indicated on rear panel in the Line Voltage Selection Block. Use the
procedure below to change line voltage.
WARNING: To prevent shock hazard, turn off instrument and
disconnect it from AC line power and all test equipment before
changing line voltage configuration.
1. Turn power switch OFF and disconnect the power cord from the unit.
Disconnect all test equipment from unit.
2. Remove all screws from rear
panel. Gently pull away rear
panel and remove enclosure
cover by sliding it to the back.
3. Modify jumper configuration to
desired line voltage (see
Figure 5-3).
4. Replace fuse to match new
voltage requirements.
5. Replace enclosure cover, rear
panel and all screws.
Figure 5-3
Jumper Configuration
Line Voltage
5-4Service
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OMEGA Model CYD201/CYD208 User’s Manual
5.7RECALIBRATION
OMEGA calibrates and certifies thermometers to original factory
specifications for a reasonable fee. You can recalibrate the thermometer to
original specifications, but OMEGA will not warrant these calibrations.
Recalibration requires a digital voltmeter (DVM) with 4½ digit resolution or
better; and 25 k and 125 k precision resistors with ±0.01% tolerance or
better.
Recalibration involves current source and analog/digital (A/D) converter
calibration. A/D calibration erases all SoftCal™ compensations; perform it
after current source calibration, not before.
5.7.1Current Source Calibration
1. Allow 30 minute warm-up to achieve rated specifications.
2. Configure 125 k resistor as shown in Figure 5-4. Set Model CYD208 to
channel 1.
3. Connect DVM voltage leads across the resistor and adjust the I ADJ
trimpot (located on rear panel) until DVM displays a voltage of 1.2500
volts ±100 microvolts.
4. Remove DVM and resistor.
Model CYD201Model CYD208
NOTE:
Do not use a voltmeter for A/D Converter Calibration.
Figure 5-4. Calibration Connections
Service5-5
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OMEGA Model CYD201/CYD208 User’s Manual
5.7.2A/D Converter Calibration
NOTE:
Current source calibration
calibration.
1. Allow 30 minute warm-up to achieve rated specifications.
2. Perform current source calibration.
3. Configure 125 k resistor as shown in Figure 5-4. Set Model 208s to
channel 1.
4. Wait 10 seconds for resistor voltage to settle.
5. Press
CAL ENABLE
, then within 2 seconds press
window shows "-CAL-" for approximately 15 seconds.
6. Repeat procedure with 25 k resistor.
7. For Model CYD208, repeat procedure for other 7 channels. See
Figure 2-2 for pin assignments.
5.8SERIAL INTERFACE CABLE AND ADAPTERS
1234 56
Figure 5-5. Model CYD200-J10 RJ-11 Cable Assembly Wiring Details
TxD
Gnd
Gnd
RxD
must
be performed
YELLOW
GREEN
RED
BLACK
before
UNITS
A/D converter
. The display
123456
13121110987654321
25 2423 22 2120 19 18 1716 15 14
DB-25 CONNECTOR
= NOT
USED
RxD
654321
Gnd
TxD
RJ-11
RECEPTACLE
Figure 5-6. Model CYD200-D RJ-11 to DB-25 Adapter Wiring Details
5-6Service
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OMEGA Model CYD201/CYD208 User’s Manual
54321
9876
DE-9 CONNECTOR
= NOT
USED
RxD
Gnd
TxD
654321
RJ-11
RECEPTACLE
Figure 5-7. Model CYD200-B RJ-11 to DE-9 Adapter Wiring Details
Service5-7
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5-8Service
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OMEGA Model CYD201/CYD208 User’s Manual
CHAPTER 6
OPTIONS AND ACCESSORIES
6.0GENERAL
This chapter lists options, accessories, sensors, wires, and special
equipment available for the Model CYD201/CYD208.
6.1ACCESSORIES
MODELDESCRIPTION OF ACCESSORY
201-MC
208-MC
CYD200-J10
CYD200-D
CYD200-B
2010
2080
2081
2082-1
2082-2
2082-3
2082-4
4-pin Mating Connector for Model CYD201 and Model
2084.
36-pin “D” Style Connector for Model CYD208.
RJ-11 to RJ-11 Phone Cord, 10 feet (3 meters). See
Figure 6-1.
RJ-11 to DB-25 Adapter. Connects RJ-11 to RS-232C
Serial Port on rear of computer. See Figure 6-1.
RJ-11 to DE-9 Adapter. Connects RJ-11 to RS-232C
Serial Port on rear of computer. See Figure 6-1.
Model CYD201 calibration connector.
Model CYD208 calibration connector.
Screw Terminal Adapter. Connects Model CYD208 to
multiple sensor/probe assemblies with stripped ends
and non- permanent wiring. Provision for attachment to
top of thermometer. Fitted with “D” type mating
connector.
Stainless steel Sensor Probe with 6-foot (1.83 m) cable
with 4 stripped ends. 4-inch (10 cm) long by
1
/8 inch
(3.2 mm) diameter probe.
Stainless steel Sensor Probe with 6-foot (1.83 m) cable
with 4-pin 201-MC mating connector. 4-inch (10 cm)
long by
Stainless steel Sensor Probe with 12-foot (3.7 m) cable
with 4 stripped ends. 6-inch (15 cm) long by
1
/8 inch (3.2 mm) diameter probe.
1
/8 inch
(3.2 mm) diameter probe.
Stainless steel Sensor Probe with 12-foot (3.7 m) cable
with 4-pin 201-MC mating connector. 6-inch (15 cm)
long by
1
/8 inch (3.2 mm) diameter probe.
Options and Accessories6-1
Page 46
OMEGA Model CYD201/CYD208 User’s Manual
ACCESSORIES
(continued)
MODELDESCRIPTION OF ACCESSORY
Sensor Probe. 12-foot (3.7 m) cable with CY-7-SD-13
sensor in CY mounting adapter, stripped ends. Tempera-
2083-1
ture limit: 325 K (52 °C). Diode sensor epoxied (Stycast)
into center of 0.564 inch (1.43 cm) diameter by 0.20 inch
(5 mm) thick copper disk. 30 AWG copper leads anchored
to disk. Mass (excluding leads): 4.3 grams.
Sensor Probe. 12-foot (3.7 m) cable with CY-7-SD-13
sensor in CY mounting adapter, with 4-pin CYD201-MC
mating connector. Temperature limit: 325 K (52 °C). Diode
2083-2
sensor epoxied (Stycast) into center of 0.564 inch (1.43
cm) diameter by 0.20 inch (5 mm) thick copper disk. 30
AWG copper leads anchored to disk. Mass (excluding
leads): 4.3 grams.
Multi-Connector Adapter. Required with Model CYD208
2084
when using multiple probe/cable assemblies and Model
201-MC mating connectors.
CYD208
-DIN
Mounting Adapter for Rack Installation. For installation in
¼
a
panel EIA rack space. See Figure 2-3.
6.2MODEL CYD201/CYD208 WIRES
LSCI P/NDESCRIPTION OF CABLE
9001-005
Quad-Twist™ Cryogenic Wire.
phosphor-bronze wire, 36 AWG, 0.127 mm (0.005 inch)
Two twisted pairs,
diameter.
9001-006
Duo-Twist™ Cryogenic Wire.
phosphor-bronze wire, 36 AWG, 0.127 mm (0.005 inch)
Single twisted pair,
diameter.
9001-007
9001-008
—
Quad-Lead™ Cryogenic Wire
flat, 32 AWG, 0.203 mm (0.008 inch) diameter.
Quad-Lead™ Cryogenic Wire
flat, 32 AWG, 0.127 mm (0.005 inch) diameter.
Any quality dual shield twisted pair wire for dewar to
Model CYD201/CYD208 connector.
. Phosphor-bronze wire,
. Phosphor-bronze wire,
6-2Options and Accessories
Page 47
OMEGA Model CYD201/CYD208 User’s Manual
6.3MODEL CYD201/CYD208 SENSORS
SENSOR NO.DESCRIPTION OF SENSOR
The smallest silicon diode Temperature Sensor
Series DT-420
available. Installs on flat surfaces. Same silicon
chip as Series CY-7 and DT-471.
Silicon Diode Miniature Temperature Sensor. Same
Series DT-450
silicon chip as CY-7 designed to install in recesses
as small as 1.6 mm dia. by 3.2 mm deep.
Silicon Diode Temperature Sensor. Repeatable,
Series CY-7
interchangeable, accurate, wide range, customized
for cryogenics.
An economical version of the CY-7 for applications
Series DT-471
where temperature measurements below 10 K are
not required.
Model CYD200- B RJ-11
to DB-2 5 Adapter
RS-232C
Interface Output
on rear of Model
CYD201 or
CYD208
To Customer Supplied Computer
DB-25 Serial Interface Connector
Model CYD200-B
RJ-11 to DE-9 Adapter
DB-9 Serial Interface Connector
To Customer Supplied Com puter
Use whichever adapter that
matches your computer
serial interface connector
Model CYD200-J10
RJ-11 Cable Assembly
J2 SERIAL I/O
Figure 6-1. Serial Interface Adapters
Options and Accessories6-3
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OMEGA Model CYD201/CYD208 User’s Manual
This Page Intentionally Left Blank
6-4Options and Accessories
Page 49
OMEGA Model CYD201/CYD208 User’s Manual
APPENDIX A
CURVE TABLES
A1.0 GENERAL
The following curve tables apply to the Model CYD201/CYD208: Curve 0 DT-500DI-8B (Table A-1), Curve 1 - DT-500DI-8A (Table A-2), Curve 2 DT-500DRC-D (Table A-3), Curve 3 - DT-500DRC-E1 (Table A-4), Curve 4 CTI Curve C (Table A-5), Curve 5 - DT-500DI-8C (Table A-6), and Curve 6 CY-7 Curve 10 (Table A-7).