Impulse SCM7B21, SCM7B30, SCM7B31 User Manual

Isolated Process Control Signal Conditioning Products

SCM7B21/30/31

Isolated Analog Voltage Input Modules

Description

Each SCM7B21/30/31 voltage input module accepts one channel of analog

voltage input which is filtered, isolated, amplified, and converted to a high level

analog voltage for output to the process control system.

These modules incorporate a five-pole filtering approach to maximize both time

and frequency response by taking advantage of both Thomson (Bessel) and

Butterworth characteristics. One pole of the filter is on the field side of the isolation

barrier; four are on the process control system side.

After the initial field-side filtering, the input signal is chopped by a proprietary

chopper circuit and transferred across the transformer isolation barrier,

suppressing transmission of common mode spikes and surges. The signal is

then reconstructed and filtered for process control system output.

Modules accept a wide 14 - 35VDC power supply range (+24VDC nominal).

Their compact packages (2.13"x1.705"x0.605" max) save space and are ideal

for high channel density applications. They are designed for easy DIN rail

mounting using any of the -DIN backpanels.

SCM7B

▲

Features

 Accepts Millivolt and Voltage Level Signals

 Provides High Level Voltage Outputs

 1500Vrms Transformer Isolation

 Accuracy, ±0.03% of Span Typical,

±0.1% Max

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 120Vrms Continuous

 Noise, 500µV Peak (5MHz), 250µV RMS

(100kHz)

 CMRR, up to 160dB

 NMR, up to 85dB

 Easy DIN Rail Mounting

 CSA Certified, FM Approved

 CE and ATEX Compliant

Figure 1: SCM7B21/30/31 Block Diagram

For information call 800-444-7644

Isolated Process Control Signal Conditioning Products

SCM7B

Specifications

Typical at 25°C and +24VDC

Module SCM7B21 SCM7B30 SCM7B31

Input

Signal Range ±10V ±10mV to ±1V ±1V to ±10V

Bias Current ±0.1nA ±0.5nA ±0.05nA

Resistance

Normal 2MΩ min 50MΩ 500kΩ min Power Off 2MΩ min 30kΩ min 500kΩ min Overload 2MΩ min 30kΩ min 500kΩ min

Protection

Continuous 120Vrms max * *

Transient ANSI/IEEE C37.90.1 * *

Output

Signal Range

Effective Available Power

Resistance <1Ω **

Protection Continuous Short-to-Ground * *

Voltage/Current Limit ±12V, ±14mA * *

CMV (Input-to-Output)

Continuous 1500Vrms max * *

Transient ANSI/IEEE C37.90.1 * *

CMRR (50 or 60Hz) 100dB 160dB 120dB

Accuracy

Nonlinearity

Stability (-40°C to +85°C)

Gain ±55ppm/°C ±35ppm/°C ±55ppm/°C

Input Offset N/A

Zero Suppression N/A ±0.005%(Vz)

Output Offset ±0.001% Span/°C ±0.002% Span/°C *

Noise

Peak at 5MHz B/W 1mV 500µV *

RMS at 10Hz to 100kHz B/W 250µV * *

Peak at 0.1Hz to10Hz B/W 1µV RTI * *

Frequency and Time Response

Bandwidth, -3dB 300Hz 3Hz *

NMR (50/60Hz) 80dB/decade >300Hz 80/85dB *

Step Response, 90% Span 1.5ms 165ms *

Supply Voltage 14 to 35VDC * *

Current

Sensitivity ±0.0002%/%V

Mechanical Dimensions 2.13" x 1.705" x 0.605" max * *

(h)(w)(d)

Environmental

Operating Temperature Range -40°C to +85°C * *

ATEX Group II, Category 3 -20°C to +40°C * *

Storage Temperature Range -40°C to +85°C * *

Relative Humidity 0 to 95% noncondensing * *

Emissions EN61000-6-4 ISM, Group 1 * *

Radiated, Conducted Class A * *

Immunity EN61000-6-2 ISM, Group 1 * *

R F Performance A ±0.5% Span Error * *

ESD,EFT,Surge,Voltage Dips Performance B * *

NOTES:

* Specification same as preceding model.

(1) Output Range and Supply Current specifications are based on minimum output load resistance. Minimum output load resistance is

calculated by V

specifications.

(2) Accuracy includes the effects of repeatability, hysteresis, and linearity.

(3) Nonlinearity is calculated using the best-fit straight line method.

(4) Input offset term included in output offset specification.

is the nominal input voltage that results in a 0V output.

(5) V

(1)

(2)

(3)

±10V

10mW 40mW *

±0.03% Span typical, * *

±0.1% Span max

±0.01% Span typical, * *



±0.02% Span max

(4)

(1)

16mA 12mA *

54.1mm x 43.3mm x 15.4mm max

/PE, where PE is the Output Effective Available Power that guarantees output range, accuracy, and linearity

OUT

±0.5µV/°C ±5µV/°C

(5)

/°C *

±0.0001%/%V

Ordering Information

Model Input Range

SCM7B21 ±10V

SCM7B30-01 0 to +10mV

SCM7B30-02 0 to +100mV

SCM7B30-03 0 to +1V

SCM7B30-05 +1 to +5V

SCM7B30-06 ±10mV

SCM7B30-07 ±100mV

SCM7B30-08 ±1V

SCM7B31-01 0 to +10V

SCM7B31-02 ±5V

SCM7B31-03 ±10V

SCM7B31-04 0 to +5V







Output Ranges Available

Output Range Part No. Suffix Example

+1 to +5V NONE SCM7B30-01

0 to +5V A SCM7B30-01A

0 to +10V D SCM7B30-01D

SCM7B

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