AD2050_15 Datasheet, PDF (1/2 Pages) Analog Devices – MICROPROCESSOR BASED THERMOCOUPLE METERS

,. ANALOG
W DEVICES
MicroprocessoBrased
ThermocouplMe eters
FEATURES
Automatic Self-Calibration for Gain, Offset, Cold Junction
Compensation and Thermocouple Linearization
J, K, T, E, R, S Thermocouple Selections (AD2050)
Universal Meter (AD2051), User Programmable
Character Serial ASCII Digital Output
Optional Linearized Analog Output: 1mV/degree
Optional Isolated 20mA LooplTTL Serial Outputs
OBSOLETE Meets DIN/NEMA Dimension Specifications
Temperature Ranges: - 265°F to + 1999°F
-165°C to + 1760°C
Power Options: 120V ac, 240V ac, + 7.5V dc to + 28V dc
APPLICATIONS
Temperature Monitoring in Laboratory, Manufacturing,
and Quality Control Environments
Process Control Temperature Measurements
Remote Data Logging
GENERAL DESCRIPTION
The AD2050 and AD205 1 are high performance, single channel,
31/2digit thermocouple meters that can measure temperatures
accurately between -265°F to + 1999°F or from -165°C to
+ l760°c. The AD2050 is factory programmed for any of the
following six thermocouple types: ], K, T, E, Rand S. The
AD205 1 is a universal meter that allows the user to select one of
the six thermocouple types via switch programming. The micro-
processor-based AD2050 and AD2051 provide gain and offset
error corrections, cold junction compensation, thermocouple
serialloop/TTL compatible interface is available. Also an optional
analog output linearized to 1mV/degree is provided for driving
recorders and other analog instruments. Selection of °C or OF
scaling is accessed by removing the front panel lens and setting
the selector switch to its proper position.
The. AD2050 and AD2051 can also be ordered with any of the
following power versions: 120V ac, 240V ac, or + 7.5V dc to
+ 28V dc. Input overvoltage protection for 300V peak (ther-
mocouple to ac line shorts) and common mode voltages as high
as 1400V peak (ac version) with overrange and open thermocouple
linearization, and °C/oF scaling automatically performed in
firmware.
detection are provided. These meters are rated for operation
over the + lOoCto + 40°C temperature range. Each meter is
burned in for 168 hours @ 50°C with on/off power cycles for
The AD2050 and AD205 1 display temperature information on
increased reliability. The AD2050 and AD2051 are supplied in
large 0.56" (l4.3mm) high LEDs. Digital information is provided
in standard ASCII character serial format with rate selection for
rugged, molded, plastic cases that meet UL94V-0 and DIN/NEMA
standard dimensions.
easy interface to printers, terminals, and other peripherals. For
remote data acquisition applications, an optional isolated 20mA
DIGIT ADDRESS
"HOT"
JUNCTION
"COLD"
JUNCTION
INTEGRATOR
&
r ' ^COMPARATOR
I
I
Ir
I
I I r-""""'" I
INTEGRATOR
CONTROL
M
I
C
DIGIT
R INFORMATION
0
P
R
0
C
E
S
DIGIT
S
0
ASCII INFO
R
SELF-CALIBRATION CHANNEL SELECT
(OPTIONAL)
+5V
ANALOG
OUTPUT
TTl SERIAL
OUTPUT
-3V
SERIAL INPUT
ISOLATED
20mA lOOP
}~,~,
Figure 1. AD2050 &AD2051 Functional Block Diagram
Information fu rnished by Analog Devices is believed to be accurate
and reliable. However, no responsibility is assumed by Analog Devices
for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implica-
tion or otherwise under any patent or patent rights of Analog Devices.
P.O. Box 280; Norwood, Massachusetts 02062 U.S.A.
Tel: [phone]
Twx: 710/394-6577
Telex: 924491
Cables: ANALOG NORWOODMASS
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