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November 24, 2003
WTC3243
Ultrastable Thermoelectric Controller
(BOTTOM VIEW)
GENERAL DESCRIPTION:
The WTC3243 is a powerful, compact analog
PI (Proportional, Integral) control loop circuit optimized for use in ultrastable thermoelectric temperature control applications.
The WTC3243 maintains precision temperature regulation using an adjustable sensor bias current and error amplifi er circuit that operates directly with thermistors, RTDs, AD590 type, and LM335 type temperature sensors.
Supply up to 2 Amps of heat and cool current to your thermoelectric from a single +5 Volt power supply. Operate resisitive heaters by disabling the cooling current output. Adjust temperature at the voltage setpoint input pin. Independently confi gure the adjustable PI control loop using simple resistors.
An evaluation board is available to quickly integrate the WTC3243 in your system.
FEATURES:
•Low Cost
•Ultrastable PI Control
•High ±2 Amps Output Current
•Control Above and Below Ambient
•Small Package Size (1.30” X 1.26” X 0.313”)
•Voltage Controlled Setpoint
•Adjustable Sensor Bias Current Source
•Adjustable Sensor Gain
•Independent Heat and Cool Current Limits
Figure 1
Top View Pin Layout and Descriptions
Control Electronics Supply Input
Voltage Setpoint
Limit A
Limit B
Proportional Gain Resistor Connection
+1 Voltage Reference
Integrator Time Constant Resistor Connection
4
5
6
1
2
3
7
TOP VIEW
I
VDD
VSET
LIMA
LIMB
P
+1V
VS
GND
OUTB
OUTA
BIAS
S+
SG
11
10
9
14
13
12
8
Power Drive Supply Input
Ground
Thermoelectric Output B
Thermoelectric Output A
Sensor Bias Current Resistor Connection
Sensor Connection & Act T Monitor
Sensor Gain Resistor Connection
IF YOU ARE UPGRADING FROM THE WHY5640: The position of Pin 1 on the WHY5640 is reversed
(or mirrored) relative to the position of Pin 1 on the WTC3243.
© 2003 WTC3243-00400-A Rev D www.teamwavelength.com
Figure 2
External Connections
Using Thermistor Temperature Sensors
PAGE 2
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
PAGE 3
ELECTRICAL AND OPERATING
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
RATING SYMBOL VALUE
Supply Voltage 1 (Voltage on Pin 1)
Supply Voltage 2 (Voltage on Pin 14)
Output Current (See SOA Chart)
V
DD
V
S
I
OUT
Power Dissipation, T
AMBIENT
= +25˚C (See SOA Chart) (with fan and heat sink)
Operating Temperature, case
Storage Temperature
P
MAX
T
OPR
T
STG
+4.5 to +30
+4.5 to +30
±2.5
9
-40 to +85
-65 to +150
UNIT
Volts DC
Volts DC
Amperes
Watts
˚C
˚C
PARAMETER
TEMPERATURE CONTROL
Short Term Stability,
1 hour
Long Term Stability,
24 hour
Control Loop
P (Proportional Gain)
I (Integrator Time
Constant)
Setpoint vs. Actual T Accuracy
OUTPUT
Current, peak, see SOA Chart
Compliance Voltage,
Pin 11 to Pin 12
Compliance Voltage,
Pin 11 to Pin 12
Compliance Voltage,
Pin 11 to Pin 12
Compliance Voltage,
Pin 11 to Pin 12
Compliance Voltage,
Resistive Heater
POWER SUPPLY
Voltage, VDD
Current, VDD supply, quiescent
Voltage, Vs
Current, Vs supply, quiescent
TEST CONDITIONS MIN TYP MAX UNITS
TSET = 25˚C using 10 k
Ω thermistor
TSET = 25˚C using 10 k
TSET = 25˚C using 10 k
Ω thermistor
Ω thermistor
0.001
0.003
P
1
0.75
0.005
0.008
PI
0.010
0.010
˚C
˚C
100 A/V
<1%
(Rev A)
<0.2%
(Rev B)
4.5
Sec.
Full Temp. Range, I
OUT
= 100 mA
±2.0
| V
S
- 0.7 |
±2.2
| V
S
- 0.5 |
± 2.5
Amps
Volts
| V
S
- 1.2 | | V
S
- 1.0 | Volts Full Temp. Range, I
OUT
= 1 Amp
Full Temp. Range, I
OUT
= 1.5 Amps | V
S
- 1.6 | | V
S
- 1.4 | Volts
Volts Full Temp. Range, I
OUT
= 2.0 Amps | V
S
- 1.8 | | V
S
- 1.6 |
Full Temp. Range, I
OUT
= 2.0 Amps | V
S
- 1.7| | V
S
- 1.6 |
4.5
4.5
20
55
50
28 Volts
105
28 mA
Volts
100 mA
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
PAGE 4
ELECTRICAL AND OPERATING
SPECIFICATIONS
PARAMETER
INPUT
Offset Voltage, initial
Bias Current
Offset Current
Common Mode Range
Common Mode Rejection
Power Supply Rejection
Input Impedence
Input voltage range
TEST CONDITIONS
Pins 2 and 9
Pins 2 and 9, T
AMBIENT
= 25˚C
Pins 2 and 9, T
AMBIENT
= 25˚C
Pins 2 and 9, Full Temp. Range
Full Temperature Range
Full Temperature Range
MIN TYP MAX UNITS
0
60
60
GND
1
20
2
85
80
500
2
50
10
VDD-2
1
VDD-2
1 mV nA nA
V dB dB k Ω
Volts
THERMAL
Heatspreader Temperature Rise
Heatspreader Temperature Rise
Heatspreader Temperature Rise
T
AMBIENT
=25˚C 28
With WHS302 Heatsink, WTW002 Thermal 18
Washer
With WHS302 Heatsink, WTW002 Thermal 3.1
Washer, and 3.5 CFM Fan
30
21.5
33
25
3.4
3.9
˚C/W
˚C/W
˚C/W
1
The bias source has a compliance up to VDD - 2.0 V. In normal operation this limits the sensor voltage range from 0.0V to VDD - 2.0V. While voltages up to +/- 5V outside this range on the Vset pin will not damage the unit, it will not provide proper control under these conditions.
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
PAGE 5
PIN DESCRIPTIONS
PIN NO.
1
2
3
4
5
6
7
8
9
10
PIN
VDD
NAME
Control Electronics Power Supply Input
VSET Voltage Setpoint
LIMA
[Transfer functions are noted on operating diagrams with a “*”]
Limit A
LIMB
P
I
+1V
SG
S+
BIAS
Limit B
Proportional Gain
Resistor Connection
+1 Volt
Integrator Time Constant
Resistor Connection
Sensor Gain Resistor Connection
Sensor Connection
Sensor Bias Current Resistor Connection
FUNCTION
Connect a +4.5V to +30V power supply to Pin 1
(VDD) and Pin 13 (GND).
Connect a voltage source between Pin 2 (VSET) and Pin 13 (GND) to control the temperature setting.
A resistor connected between Pin 3 (LIMA) and
Pin 13 (GND) limits the output current drawn off the Pin 14 (VS) supply input to the Pin 11
(OUTA).
A resistor connected between Pin 4 (LIMB) and
Pin 13 (GND) limits the output current drawn off the Pin 14 (VS) supply input to the Pin 12
(OUTB).
Connect a resistor between Pin 5 (P) and Pin 6
(+1V) to confi gure the Proportional Gain setting.
+1 Volt Reference
Connect a resistor between Pin 7 (I) and Pin
6 (+1V) to confi gure the Integrator Time Constant setting.
Connect a resistor between Pin 8 (SG) and Pin 13
(GND) to adjust the Sensor Gain setting.
Connect resistive and LM335 type temperature sensors across Pin 9 (S+) and Pin 13 (GND).
Connect a 10 k Ω resistor across Pin 9 (S+) and
Pin 13 (GND) when using AD590 type temperature sensors. The negative terminal of the AD590 sensor connects to Pin 9 (S+) and the positive terminal to Pin 1 (VDD). AD590 operation requires that VDD be +8 Volts or greater for proper operation.
Connect a resistor between Pin 10 (BIAS) and Pin
1 (VDD) to confi gure the sensor bias current.
IF YOU ARE UPGRADING FROM THE WHY5640: The position of Pin 1 on the WHY5640 is reversed
(or mirrored) relative to the position of Pin 1 on the WTC3243.
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
PAGE 6
PIN NO. PIN
11
12
13
14
PIN DESCRIPTIONS
OUTA
NAME
Thermoelectric Output A
OUTB Thermoelectric Output B
GND Ground
VS Power Drive Supply Input
FUNCTION
Connect Pin 11 (OUTA) to the negative terminal on your thermoelectric when controlling temperature with Negative Temperature
Coeffi cient thermistors.
Connect Pin 11 (OUTA) to the positive thermoelectric terminal when using Positive
Temperature Coeffi cient RTDs, LM335 type, and AD590 type temperature sensors.
Connect Pin 12 (OUTB) to the positive terminal on your thermoelectric when controlling temperature with Negative Temperature
Coeffi cient thermistors.
Connect Pin 12 (OUTB) to the negative thermoelectric terminal when using Positive
Temperature Coeffi cient RTDs, LM335 type, and
AD590 type temperature sensors.
Connect the power supply ground connections to
Pin 13 (GND). All ground connections to this pin shall be wired separately.
Provides power to the WTC3243 H-Bridge power stage. Supply range input for this pin is +3 to
+30 Volts DC. The maximum current drain on this terminal should not exceed 2.5 Amps.
CAUTION: Care should be taken to observe the maximum power dissipation limits when operating with supply voltages greater than +12V.
IF YOU ARE UPGRADING FROM THE WHY5640: The position of Pin 1 on the WHY5640 is reversed
(or mirrored) relative to the position of Pin 1 on the WTC3243.
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
PAGE 7
TYPICAL PERFORMANCE GRAPHS
Caution:
Do not exceed the Safe Operating Area (SOA). Exceeding the SOA voids the warranty.
To determine if the operating parameters fall within the SOA of the device, the maximum voltage drop across the controller and the maximum current must be plotted on the SOA curves.
These values are used for the example SOA determination:
Vs= 12 volts
Vload = 5 volts
ILoad = 1 amp
}
These values are determined from the specifi cations of the TEC or resistive heater
Follow these steps:
1. Determine the maximum voltage drop across the controller ,Vs-Vload, and mark on the X axis. (12volts - 5 volts = 7 volts, Point A)
2. Determine the maximum current, ILoad, through the controller and mark on the Y axis:
(1 amp, Point B)
3. Draw a horizontal line through Point B across the chart. (Line BB)
4. Draw a vertical line from Point A to the maximum current line indicated by Line BB.
5. Mark Vs on the X axis. (Point C)
6. Draw the Load Line from where the vertical line from point A intersects Line BB down to Point C.
Refer to the chart shown below and note that the Load Line is in the Unsafe Operating Areas for use with no heatsink
(1) or the heatsink alone (2), but is outside of the Unsafe Operating Area for use with heatsink and Fan (3).
WTC3243 Safe Operating Area
25 C Ambient
75 C Case
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
SOA Charts for Customer Use:
25 C Ambient
75 C Case
PAGE 8
25 C Ambient
75 C Case
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
PAGE 9
OPERATION
1. CONFIGURING HEATING AND
COOLING CURRENT LIMITS
Refer to Table 1 to select appropriate resistor values for R
A
and R
B
.
Setting Current Limits Independently
Using Trimpots
The 5k
Ω trimpots shown in Figure 4 adjust the maximum output currents from 0 to 2.3
Amps.
Heat and Cool Current Limits
Table 1
Current Limit Set Resistor vs
Maximum Output Current
Maximum
Output
Currents
(Amps)
Current
Limit Set
Maximum
Output
Resistor,
(k
Ω)
R
A
,R
B
Current
(Amps)
Current
Limit Set
Resistor,
(k
Ω) R
A
,R
B
0.0 1.60 1.2 3.05
0.1 1.69 1.3 3.23
0.2 1.78 1.4 3.43
0.3 1.87 1.5 3.65
0.4 1.97 1.6 3.88
0.5 2.08 1.7 4.13
0.7 2.31 1.9 4.72
0.8 2.44 2.0 5.07
0.9 2.58 2.1 5.45
1.0 2.72 2.2 5.88
1.1 2.88 2.3 6.36
Figure 3
Fixed Heat and Cool Current
Limits
Figure 4
Independently Adjustable Heat and Cool Current Limits
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
PAGE 10
OPERATION
2.
RESISTIVE HEATER
The WTC3243 can operate resistive heaters by disabling the cooling output current.
When using Resistive Heaters with NTC thermistors, connect Pin 3 (LIMA) to Pin 13
(GND) with a 1.5 k
Ω resistor.
Connect Pin 4 (LIMB) to Pin 13 (GND) with a 1.5 k
Ω resistor when using RTDs, LM335 type, and AD590 type temperature sensors with a resistive heater.
3. DISABLING THE OUTPUT
CURRENT
The output current can be enabled and disabled, as shown in Figure 5, using a DPDT (Double Pole–Double Throw) switch.
4. ADJUSTING THE SENSOR BIAS
CURRENT AND SENSOR GAIN
FOR RESISTIVE TEMPERATURE
SENSORS
Connect a resistor R
BIAS
between Pin 10
(BIAS) and Pin 1 (VDD) to adjust the sensor bias current. Table 2 lists the suggested resistor values for R
BIAS versus the range of resistances of the resistive temperature sensor. Equation 1 demonstrates how to calculate a value of R
BIAS
given a desired sensor bias current, I
BIAS
.
The sensor signal applied to Pin 9 (S+) can be amplifi ed up to a factor of 10 by inserting a resistor, R
S
, between Pin 8 (SG) and Pin
13 (GND). Connect Pin 8 (SG) directly to
Pin 13 (GND) for a sensor gain of 10. The lower the value of R
S
, the more gain applied to the sensor signal.
Equation 2 demonstrates how to calculate a value for R
S
given a desired sensor gain.
Table 2 lists the suggested resistor values for R
S
versus the range of resistances of the resistive temperature sensor.
Figure 5
Disabling the Output Current
Equation 1
Calculating R
BIAS
R
BIAS
=
2
I
BIAS
[Ω]
Equation 2
Calculating R
S
R
S
90,000
= o
(G sensor
- 1)
10,000 p [
Ω]
Table 2
Sensor Gain Resistor R
S
vs Resistance
Temperature Sensor
Sensor
Resistance
Range
35Ω to 350Ω
Sensor Bias
Resistor,
R
BIAS
Sensor
Bias Current
2 kΩ 1mA
350Ω to 3.5kΩ 2 kΩ 1mA
Sensor Gain
Resistor, R
S
SHORT
OPEN
Sensor
Gain
10
1
3.5kΩ to 35kΩ 20 kΩ
35kΩ to 350kΩ 200 kΩ
100µA
10µA
OPEN
OPEN
1
1
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
PAGE 11
OPERATION
5. ADJUSTING THE CONTROL LOOP
The control loop proportional gain can be adjusted by inserting a resistor, R
P
,
between
Pin 5 (P) and Pin 6 (+1V) to set I from 1 to
100.
Equation 3 demonstrates how to calculate a value for R
P given a desired proportional gain.
Equation 4 demonstrates how to calculate the Proportional gain, P, given a value for
R P.
Table 3 lists the suggested resistor values for R
P versus sensor type and the thermal loads ability to change temperature rapidly.
Equation 3
Calculating R p from P
Equation 4
Calculating P From R p
Equation 5
Calculating R
I from I
TC
Equation 6
Calculating I
TC
from R
I
6. ADJUSTING THE CONTROL LOOP
INTEGRATOR TIME CONSTANT
The control loop integrator time constant can be adjusted by inserting a resistor, R
I
,
between Pin 6 (+1V) and Pin 7 (I) to set I
TC from 0.75 to 4.5 seconds.
Equation 5 demonstrates how to calculate a value for R
I
given a desired integrator time constant. The integrator time constant, I
TC
,
is measured in seconds.
Equation 6 demonstrates how to calculate the integrator time constant, I
TC
, given a value for R
I
.
Table 4 lists the suggested resistor values for R
I
versus sensor type and the thermal loads ability to change temperature rapidly.
© 2003
Table 3
Proportional Gain Resistor R
P
vs Sensor Type and Thermal Load Speed
Proportional Gain
Resistor,R
P
4.99 kΩ
24.9 kΩ
100 kΩ
Open
24.9 kΩ
Proportional Gain,
[Amps/Volt]
5
20
50
100
20
Sensor Type/
Thermal Load Speed
Thermistor/Fast
Thermistor/Slow
RTD/Fast
RTD/Slow
AD590 or LM335/
Fast
100 kΩ 50 AD590 or LM335/
Slow
Table 4
Integrator Time Constant vs Sensor Type and
Thermal Load Speed
Integrator Resistor,
RI
Integrator Time
Constant, [Seconds]
33.3 k Ω 3
Sensor Type/
Thermal Load Speed
Thermistor/Fast
20 k
Ω
4.5
Thermistor/Slow
0.75
RTD/Fast Open
300 k
Ω
300 k
Ω
1
1
RTD/Slow
AD590 or LM335/
Fast
20 k Ω 4.5
AD590 or LM335/
Slow
WTC3243-00400-A Rev D www.teamwavelength.com
TOP VIEW
PAGE 12
OPERATION
7. OPERATING WITH THERMISTOR
Figure 6 demonstrates how to confi gure the WTC3243 for operation with a 10 k
Ω thermistor temperature sensor.
FIGURE 6
Confi guring the WTC3243 to operate with
Thermistors
IF YOU ARE UPGRADING FROM THE WHY5640:
The position of Pin 1 on the WHY5640 is reversed
(or mirrored) relative to the position of Pin 1 on the
WTC3243.
To Convert ACT T voltage to actual temperature:
Sensor Resistance = ACT T Voltage
Sensor Bias Current (I)
*
VSET =
SENSOR RESISTANCE *
SENSOR BIAS CURRENT
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
OPERATION
8. OPERATING WITH RTD
Figure 7 demonstrates how to confi gure the WTC3243 for operation with a 100
Ω
Platinum RTD temperature sensor.
FIGURE 7
Confi guring the WTC3243 to operate with
RTDs
TOP VIEW
PAGE 13
NOTE: Here, Pin 8 is grounded, adding an internal sensor gain of 10. Pin 9 will read
10 times less than pin 2. If used with the Demo PCB, pin 9 will match pin 2.
To Convert ACT T voltage to actual temperature:
Sensor Resistance =
Sensor Bias Current (I)
*VSET =
SENSOR RESISTANCE *
SENSOR BIAS CURRENT * 10
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
OPERATION
9. OPERATING WITH LM335 TYPE
Figure 8 demonstrates how to confi gure the
WTC3243 for operation with a National Semiconductor LM335 temperature sensor.
FIGURE 8
Confi guring the WTC3243 to operate with a
National Semiconductor LM335 Temperature
Sensor
TOP VIEW
PAGE 14
*
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
OPERATION
10. OPERATING WITH AD590 TYPE
Figure 9 demonstrates how to confi gure the
WTC3243 for operation with an Analog Devices
AD590 Temperature Sensor.
FIGURE 9
Confi guring the WTC3243 to operate with an
Analog Devices AD590 Temperature Sensor
TOP VIEW
PAGE 15
*
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
11. OPERATING THE WTC3243 WITH
RESISTIVE HEATERS
The WTC3243 can effi ciently control a wide range of resistive heaters. Since resistive heaters do not require bipolar current drive, one side of a resistive heater can be directly connected to Vs, which bypasses part of the H, drive circuitry inside the WTC3243.
This reduces internal power dissipation and increases the output power capacity of the
WTC3243.
Safe operation considerations:
1. Resistive heater applications are still subject to the SOA limitations of the WTC3243 and should be plotted on the SOA charts on page
8.
2. The resistive heater must connect to the appropriate output pins according to the sensor type. For thermistors, connect the heater between Vs and Pin12 (OUTB).
For all other sensor types, connect the heater between Vs and
EXAMPLE:
Heater resistance: 10 ohms
Desired Output Power: 15 watts
Calculate output current required for 15 watts of output power:
P=I
2
*R 15 =I
2
*10 I=1.2 amps
This current will require a voltage across the heater of:
V = I*R V=1.2*10 V=12.2 volts
The supply voltage required is the sum of the heater voltage and the internal voltage drop (from page 3) of the WTC3243:
Vs = 12.2 + 1.5 Vs=13.7 volts.
A 15 volt, 1.5 amp power supply could be chosen for this application.
PAGE 16
These values are plotted on the SOA chart shown as shown below.
·Point A:
·Point B, Line BB:
Max current = 1.2 amps
·Point C, Vs = 15 Volts
·Load Line:
From Intersection of vertical line from Point A to Line BB down to Point C
The position of the load line shows that the
WTC3243 can only be used safely with a heatsink and fan.
Contact Wavelength Electronics technical support at (406) 587-4910 for assistance with plotting SOA charts or for information on high resistance applications.
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
TOP VIEW
PAGE 17
OPERATION
12. OPERATING RESISTIVE HEATER
WITH THERMISTOR
TEMPERATURE SENSORS
Figure 4 demonstrates how to confi gure the WTC3243 for operation with a 10 k
Ω thermistor temperature sensor.
FIGURE 10
Confi guring the WTC3243 to operate with
Thermistors
IF YOU ARE UPGRADING FROM THE WHY5640:
The position of Pin 1 on the WHY5640 is reversed
(or mirrored) relative to the position of Pin 1 on the
WTC3243.
To Convert ACT T voltage to actual temperature:
Sensor Resistance =
ACT T Voltage
Sensor Bias Current (I)
* VSET =
SENSOR RESISTANCE *
SENSOR BIAS CURRENT
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
PAGE 18
OPERATION
13. HELPFUL HINTS
Selecting a Temperature Sensor
Select a temperature sensor that is responsive around the desired operating temperature. The temperature sensor should produce a large sensor output for small changes in temperature.
Sensor selection should maximize the voltage change per C for best stability.
Table 5
Temperature Sensor Comparison
SENSOR Thermistor RTD AD590 LM335
RATING Best Poor Good Good
Table 6 compares temperature sensors versus their ability to maintain stable load temperatures with the WTC3243.
Mounting the Temperature Sensor
The temperature sensor should be in good thermal contact with the device being temperature controlled. This requires that the temperature sensor be mounted using thermal epoxy or some form of mechanical mounting and thermal grease.
Hint: Resistive temperature sensors and
LM335 type temperature sensors should connect their negative termination directly to
Pin 13 (GND) to avoid parasitic resistances and voltages effecting temperature stability and accuracy.
Avoid placing the temperature sensor physically far from the thermoelectric. This is typically the cause for long thermal lag and creates a sluggish thermal response that produces considerable temperature overshoot once at the desired operating temperature.
Mounting the Thermoelectric
The thermoelectric should be in good thermal contact with its heatsink and load. Contact your thermoelectric manufacturer for their recommended mounting methods.
Heatsink Notes
If your device stabilizes at temperature but then drifts away from the setpoint temperature towards ambient, you are experiencing a condition known as thermal runaway. This is caused by insuffi cient heat removal from the thermoelectric’s hot plate and is most commonly caused by an undersized thermoelectric heatsink.
Ambient temperature disturbances can pass through the heatsink and thermoelectric and affect the device temperature stability. Choosing a heatsink with a larger mass will improve temperature stability.
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
MECHANICAL SPECIFICATIONS
PAGE 19
PCB FOOTPRINT
© 2003
WTC3243-00400-A Rev D www.teamwavelength.com
PAGE 20
CERTIFICATION AND WARRANTY
CERTIFICATION:
Wavelength Electronics (WEI) certifi es that this product met it’s published specifi cations at the time of shipment. Wavelength further certifi es that its calibration measurements are traceable to the United States National Institute of Standard and Technology, to the extent allowed by that organization’s calibration facilities, and to the calibration facilities of other International Standards
Organization members.
NOTICE:
The information contained in this document is subject to change without notice. Wavelength will not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Wavelength.
WARRANTY:
This Wavelength product is warranted against defects in materials and workmanship for a period of one year from date of shipment. During the warranty period, Wavelength, will, at it’s option, either repair or replace products which prove to be defective.
WARRANTY SERVICE:
For warranty service or repair, this product must be returned to the factory. For products returned to Wavelength for warranty service, the Buyer shall prepay shipping charges to Wavelength and
Wavelength shall pay shipping charges to return the product to the Buyer. However, the Buyer shall pay all shipping charges, duties, and taxes for products returned to Wavelength from another country.
LIMITATIONS OF WARRANTY:
The warranty shall not apply to defects resulting from improper use or misuse of the instrument outside published specifi cations.
No other warranty is expressed or implied. warranties of merchantiability and fi tness for a particular purpose.
EXCLUSIVE REMEDIES:
The remedies provided herein are the Buyer’s sole and exclusive remedies. Wavelength shall not be liable for any direct, indirect, special, incidental, or consequential damages, whether based on contract, tort, or any other legal theory.
SAFETY:
There are no user serviceability parts inside this product. Return the product to Wavelength
Electronics for service and repair to assure that safety features are maintained.
LIFE SUPPORT POLICY:
As a general policy, Wavelength Electronics, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the Wavelength Electronics, Inc. product can be reasonably expected to cause failure of the life support device or to signifi cantly affect its safety or effectiveness. Wavelength
Electronics, Inc. will not knowingly sell its products for use in such applications unless it receives written assurances satisfactory to Wavelength
Electronics, Inc. that the risks of injury or damage have been minimized, the customer assumes all such risks, and there is no product liability for Wavelength Electronics, Inc. Examples or devices considered to be life support devices are neonatal oxygen analyzers, nerve stimulators (for any use), auto transfusion devices, blood pumps, defi brillators, arrhythmia detectors and alarms, pacemakers, hemodialysis systems, peritoneal dialysis systems, ventilators of all types, and infusion pumps as well as other devices designated as “critical” by the FDA. The above are representative examples only and are not intended to be conclusive or exclusive of any other life support device.
WAVELENGTH ELECTRONICS, INC.
51 Evergreen Drive
Bozeman, Montana, 59715
© 2003 phone:(406) 587-4910 Sales and Technical Support
(406) 587-4183 Accounting e-mail: [email protected]
web: www.teamwavelength.com
WTC3243-00400-A Rev D www.teamwavelength.com
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