7B32 ISOLATED, PROCESS CURRENT INPUT




Functional Description

7B32-01-1 The 7B32 is a single-channel signal conditioning module that interfaces, amplifies and filters a process-current input and provides a protected precision output voltage of either +1 V to +5 V or 0 V to +10 V. Process-current input signals are measured by reading the voltage across an internal 200 Ω protected resistor. Model 7B32 features a nonlinearity of ±0.02% maximum and an accuracy of ±0.1% maximum (±0.01% typical). 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 105 dB @ 50/60 Hz is provided. Rated to operate with a nominal +24 V DC supply, Model 7B32 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.

Inside the 7B32 Series Module

The floating current input of Model 7B32 is fully protected up to 120 V rms line voltage. A one-pole 100 Hz filter preconditions the voltage signal across the 200 Ω protected input resistor prior to amplification by a low drift amplifier. 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 two-pole low pass filter (-3 dB @100 Hz), a buffer amplifier and a power oscillator. The two-pole output filter and subsequent buffer ensures that a low noise, low impedance (<1 Ω) signal is available at the output to drive loads to 2 kΩ minimum.



7B32 FBD

Figure 1. 7B32 Functional Block Diagram

 

Input Types

4 mA to 20 mA

0 to 20 mA

Output Options

+1 V to +5 V

0 V to +10 V

 
7B32FCD

Figure 2. 7B32 Input Field Connections



7B32 Models Available
  Model Input Range Output Range
Order Now 7B32-01-1 +4 mA to +20 mA +1 V to +5 V
Order Now 7B32-01-2 0 mA to +20 mA 0 V to +10 V


7B32 Specifications
(typical @ +23°C ±5°C and Vs = +24 V dc)
Description Model 7B32
Input Range1
Standard Ranges 4 mA to 20 mA; 0 mA to 20 mA
(Refer to Model Table)
Custom Ranges Not Available*
Output Range Options (RL > 2 kΩ) +1 V to +5 V or 0 V to +10 V
Accuracy1
Initial @ +25°C ±0.01% Span (±0.1% Span, maximum)
Nonlinearity2 ±0.02% Span, maximum
Input Offset vs. Temperature N/A3
Span vs. Temperature ±35 ppm/°C
Output Offset vs. Temperature ±0.003% Span/°C
Input Resistance
Power ON 200 Ω
Power OFF 200 Ω, minimum
Output Noise
5 MHz Bandwidth 6 mV peak
10 Hz to 100 kHz Bandwidth 0.4 mV rms
0.1 Hz to 10 Hz Bandwidth 4 µV peak
Bandwidth, -3 dB 100 Hz
Output Rise Time, 10% to 90% Span 10 ms
Common-Mode Voltage (CMV)
Input-to-Output and Power 1500 V ms, continuous
Common Mode Rejection (CMR)
Input-to-Output and Power @ 50/60 Hz 105 dB
Input Protection 120 V rms, continuous
±35 V dc, continuous
Input Transient Protection ANSI/IEEE C376.90.1-1989
IEEE-STD 472
IEC 255-4, Class II
Output Resistance < 1 Ω
Voltage Output Protection Continuous Short to Ground
Power Supply
Voltage Range, Operating +14 V dc to +35 V dc
Current +25 mA, maximum
Sensitivity ±0.0001%/% of Vs
Mechanical Dimensions 1.663" x 2.11" x 0.563"
(42.24 mm x 53.6 mm x 14.3 mm)
Weight 60 grams
Environmental
Temperature Range
   Operating -40°C to +85°C
   Storage -40°C to +85°C
Relative Humidity, 24 hours 0 to 90% @ +60°C noncondensing
ESD Sensitivity IEC 801-2, Level 2
RFI Susceptibility ±0.5% Span error @ 400 MHz, 5 Watt, 3 ft

Warm-up time required to meet specifications is approximately 10 minutes.
* Contact factory for OEM requirements.
1Includes the combined effects of repeatability, hysteresis, and nonlinearity.
2Nonlinearity is calculated using best-fit straight line method.
3Vz is the nominal input voltage that results in a 0 V output.
Specifications subject to change without notice.

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