2B50_15 Datasheet, PDF (1/2 Pages) Analog Devices – ISOLATED THERMOCOUPLE SIGNAL CONDITIONER

ANALOGDEVICES fAX-ON-DEHAND HOTLINE - Pag!! 28
,. ANALOG
W DEVICES
IsolatedT, hermocouple
SignalConditioner
I
FEATURES
2850 I
FUNCTIONAL BLOCK DIAGRAM
Acc8pb J. K. T. E. R. S or 8 Thermocouple Types
"1nternally Provided Cold Junction Compensation
High CMVlso"n: :t:1500Vpk
HighCMR: 16OdBmin 0 60Hz
Low Drift: :t:1p.vfc max (2860B)
High Unearity: :to.O1" max (2850B)
Input Protection end Filtering
Screw Termine' Input Connections
OU'TPtII'OF""
AI>IUST
....
,.
OBSOLETE APPLICATIONS
Precision Th8-mocouple Signal Conditioning For:
ProcessControl and Monitoring
Industrial Au1Dmation
Energy Management
D8ta Acquisition Systems
GENERAL DESCRIPTION
The model 2B50 is a high performance thermocouple signal
conditioner providing input protection, isolation and common
mode rejection, amplification, filtering and integral cold junc-
tion compensation in a single, compact package.
The 2B50 has been designed to condition low level analog
signals, such as those produced by thermocouples, in the pres-
ence of high common mode voltages. Featuring direct thermo-
couple connection via screw terminals and internally provided
reference junction temperature sensor, the 2B50 may be jump-
""^~"'R..- . 1<,1' ""EN""'"
, our . IN ,~
t>ETKJ1QN
CJC HNSOII
rROGIWIIIUNG
+v
"""
y--J
"""'LLATOR
POWER
In thermocouple temperatUre measurement applications, out-
standing featUres such as low drift, high noise rejection, and
lSOOV isolation make the 2B50 an ideal choice for systeII15
used in harsh industrial environmentS.
DESIGN FEATURES AND USER BENEFITS
ltigh Re6ability: To assure high reliability and provide isola-
tion protection to electronic instrumentation, the 2B50 has
been conservatively designed to meet the IEEE Standard for
transient voltage protection (472-1974: SWC) and provide
220V rms differential input protection.
er programmed to provide cold junction compensation for
thermocouple types J, K, T, and B, or resistor programmed for
types E, R, and S.
High Noise Rejection: The 2B50 features internal filtering
circuitry for elimination of errors caused by RFI/EMI, series
mode noise, and 50Hz/60Hz pickup.
The high performance of the 2B50 is accomplished by the use
of reliable transformer isolation techniques. This assures com-
plete input to output galvanic isolation (:!:1500V pk) and
excellent common mode rejection (16OdB @60Hz).
Ease of Use: Internal compensation enables the 2B50 to be
used with seven different thermocouple types. Unique circuit-
ry offers a choice of internal or remote reference junction
temperature sensing. Thermocouple connections may be
Other key features include: input protection (220V rms),
made either by serew terminals or. in applications requiring
- ^{filterin{ (NMR of 7OdB @60fh), low drift amplification}
(:!:lpVIC max 2B50B), and high linearity (:t:O.Ol%max-
2B50B).
PSCmaBlloaPradckcaognen.ec1t.i5on"s_x,
by
2.5
"^te_x^rm0in.6al"._{SpIiZnse.conserves}
board
space.
APPUCATIONS
The 2B50 has been designed to provide thermocouple signal
conditioning in data acquisition systems, computer inter-
face syitcms, and temperature measurement and control
instrumentation.
-1-