The 7B47 is a single-channel signal conditioning module that
interfaces, amplifies and filters input voltages from a J, K, T, E, R,
S, B, or N-type thermocouple and provides an isolated and
protected precision output of either +1V to +5V or 0 to +10 V,
linear with input temperature. High accuracy internal cold
junction compensation and a predictable upscale open circuit
indication provide a complete signal conditioning solution. To
accurately measure low level signals in electrically noisy
environments, 1500 V rms of galvanic transformer-based
isolation with a common mode rejection (CMR) of 160 of 160
dB @ 50/60 Hz and a normal mode rejection (NMR) of 60 dB @
50/60 Hz are provided. Rated to operate with a nominal +24
VDC supply, Model 7B47 is mix-and-match and hot-swappable
with other 7B Series input modules, so it can be inserted or
removed from any socket in the same backplane without
disturbing system power.
The three input pins of model 7B47 are fully protected up to
120 V rms line voltages. A one-pole 3 Hz filter preconditions the
thermocouple signal prior to amplification, provided by a low
drift input amplifier. Cold junction compensation (CJC) is
implemented using a thermistor temperature sensor embedded
under the input screw terminal block on a 7B Series backplane.
A voltage reference source acts to offset the thermocouple
signal in accordance with the specified lower bound on the
input temperature range. A current source provides the upscale
open circuit indication. Amplitude modulation is used to
implement transformer isolation (1500) V rms input-to-output
and power). Isolated front-end circuitry power is supplied by a
DC/DC converter. The output section contains a demodulator,
linearizer. A two-pole low pass filter (-3 dB @ 3 Hz), a buffer
amplifier and a power oscillator. The two-pole output filter and
subsequent buffer ensures that a low noise, low impedance
(<1Ω) signal is available at the output to drive loads down to 2
kΩ .
Figure 2
Rev. 0 | Page 2 of 8
7B47
7B47 Models Available
Model
7B47-J-01-1
7B47-J-01-2
7B47-J-02-1
7B47-J-02-2
7B47-K-03-1
7B47-K-03-2
7B47-K-04-1
7B47-K-04-2
7B47-T-05-1
7B47-T-05-2
7B47-T-06-1
7B47-T-06-2
7B47-E-07-1
7B47-E-07-2
7B47-R-08-1
7B47-R-08-2
7B47-S-09-1
7B47-S-09-2
7B47-B-10-1
7B47-B-10-2
7B47-N-11-1
7B47-N-11-2
1
Input Type
Type J
Type J
Type J
Type J
Type K
Type K
Type K
Type K
Type T
Type T
Type T
Type T
Type E
Type E
Type R
Type R
Type S
Type S
Type B
Type B
Type N
Type N
Input Range
0°C to +760°C (+32°F to +1400°F)
0°C to +760°C (+32°F to +1400°F)
-100°C to +300°C (-148°F to +572°F)
-100°C to +300°C (-148°F to +572°F)
0°C to +1300°C (+32°F to +2372°F)
0°C to +1300°C (+32°F to +2372°F)
0°C to +600°C (-148°F to +1112°F)
0°C to +600°C (-148°F to +1112°F)
0°C to +400°C (+32°F to +752°F)
0°C to +400°C (+32°F to +752°F)
-100°C to +200°C (-148°F to +392°F)
-100°C to +200°C (-148°F to +392°F)
0°C to +900°C (+32°F to +1652°F)
0°C to +900°C (+32°F to +1652°F)
+500°C to +1750°C (+932°F to +3182°F)
+500°C to +1750°C (+932°F to +3182°F)
+700°C to +1750°C (+1292°F to +3182°F)
+700°C to +1750°C (+1292°F to +3182°F)
+800°C to +1800°C (+1472°F to +3272°F)
+800°C to +1800°C (+1472°F to +3272°F)
+200°C to +1300°C (+392°F to +2372°F)
+200°C to +1300°C (+392°F to +2372°F)
Output Range
+1 V to +5 V
0 V to +10 V
+1 V to +5 V
0 V to +10 V
+1 V to +5 V
0 V to +10 V
+1 V to +5 V
0 V to +10 V
+1 V to +5 V
0 V to +10 V
+1 V to +5 V
0 V to +10 V
+1 V to +5 V
0 V to +10 V
+1 V to +5 V
0 V to +10 V
+1 V to +5 V
0 V to +10 V
+1 V to +5 V
0 V to +10 V
+1 V to +5 V
0 V to +10 V
Accuracy
1
(Typical)
±0.15% Span
±0.13% Span
±0.16% Span
±0.14% Span
±0.15% Span
±0.15% Span
±0.09% Span
±0.08% Span
±0.24% Span
±0.19% Span
±0.29% Span
±0.25% Span
±0.18% Span
±0.15% Span
±0.29% Span
±0.25% Span
±0.13% Span
±0.11% Span
±0.19% Span
±0.17% Span
±0.14% Span
±0.09% Span
Accuracy
1
(Maximum)
±0.38% Span
±0.32% Span
±0.35% Span
±0.30% Span
±0.35% Span
±0.32% Span
±0.20% Span
±0.18% Span
±0.05% Span
±0.38% Span
±0.57% Span
±0.47% Span
±0.41% Span
±0.34% Span
±0.36% Span
±0.30% Span
±0.31% Span
±0.25% Span
±0.41% Span
±0.35% Span
±0.31% Span
±0.27% Span
Accuracy includes the effects of repeatability, hysteresis and conformity. The CJC sensor accuracy should be added to the 7B47 module accuracy listed in these tables in order to
compute the overall system accuracy.
Rev. 0 | Page 3 of 8
7B47
7B47 Specifications
(typical @ +23°C ±5°C and V
s
= +24 V dc)
Description
Input Ranges
Thermocouple Types
Standard Temperature Ranges
Custom Ranges
Output Range Options (R
L
> 2 kΩ)
J, K, T, E, R, S, B, N
Refer to Model Table
Not Available*
+1 V to +5 V or 0 V to +10 V
Accuracy
1
Initial @ +25°C
Input Offset vs. Temperature
Zero Suppression vs. Temperature
Span vs. Temperature
Output Offset vs. Temperature
Refer to Model Table
±0.5 µV/°C
±0.005% (V
z
)
3
/°C
±40 ppm/°C
±0.002% Span/°C
Cold Junction Compensation
Accuracy
4
, over +5°C to +45°C ambient
Input Bias Current
±1.0°C, maximum
+25 nA
Input Resistance
Power ON
Power OFF
10 MΩ
30 kΩ, minimum
Output Noise
5 MHz Bandwidth
10 Hz to 100 kHz Bandwidth
0.1 Hz to 10 Hz Bandwidth
Bandwidth, -3 dB
Output Rise Time, 10% to 90% Span
7 mV peak
1 mV rms
0.5 µV peak
3 Hz
150 ms
Common-Mode Voltage (CMV)
Input-to-Output and Power
1500 V rms, continuous
Common Mode Rejection (CMR)
Input-to-Output and Power @ 50/60 Hz
Normal Mode Rejection @ 50/60 Hz
Input Protection
Input Transient Protection
160 dB
60 dB
120 V rms, continuous
±35 V dc, continuous
ANSI/IEEE C376.90.1-1989
IEEE-STD 472
IEC 255-4, Class II
<1
Ω
Continuous Short to Ground
Power Supply
Voltage Range, Operating
+14 V dc to +35 V dc
Model 7B47
Output Resistance
Voltage Output Protection
Rev. 0 | Page 4 of 8
7B47
Current
Sensitivity
Mechanical Dimensions
Weight
+25 mA, maximum
±0.0001%/% of Vs
1.663" x 2.11" x 0.563"
(42.24 mm x 53.6 mm x 14.3 mm)
60 grams
Environmental
Temperature Range
Operating
Storage
Relative Humidity, 24 hours
ESD Sensitivity
RFI Susceptibility
Warm-up time required to meet specifications is approximately 10 minutes.
* Contact factory for OEM requirements.
1
Includes the combined effects of repeatability, hysteresis, and nonlinearity.
2
Nonlinearity is calculated using best-fit straight line method.
3
When used with the CJC temperature sensor provided an each
