Analog Devices B13 Datasheet

Isolated, Field Configurable Analog Input

FEATURES

Single-channel isolated signal-conditioning modules.
Accepts outputs from platinum, nickel and copper RTD

sensors.
Complete microcomputer-based data acquisition systems.
Can be remotely reconfigured for various sensor types and

input ranges.

APPLICATIONS

Process Monitoring & Control
Test Stand Automation
Machine Monitoring
Material Testing
Remote Energy Mangement
Laboratory Data Acquisition

PRODUCT OVERVIEW

The 6B Series delivers sensor-to-host signal-conditioning for
remote applications. Software-configurable for a wide variety of
sensor types, including: analog input, analog output, and digital
I/O, the 6B Series is intended for remote data acquisition,
machine monitoring, remote energy management and process
monitoring and control applications.

Including transformer-based isolation, ranging, linearization,
A/d conversion and RS-232C/RS-485 serial communication for
up to 256 channels per serial port, the 6B Series modules and
boards are a complete, low-cost interface between computers
and analog signals.

All 6B Series input/output modules are fully encapsulated and
identical in pin-out and size, facilitating their ability to be mixed
and matched with all other 6B Series modules on the same
backplane. The 6B Series is fully rated over the industrial
temperature range of -25

Each 6B Series module and board is a complete
microcontroller-based process monitoring and control system,
with all calibration, address and linearizing parameters stored in

o

C to +85oC.

6B13 / 6B13HV

non-volatile memory. Being microcontroller-based, 6b Series
modules can be configured for various sensor types, including
RTD and thermocouple, and a wide variety of input ranges. This
reduces the number of different modules that need to be used
in a given application and carried in inventory.

FUNCTIONAL BLOCK DIAGRAM

Figure 1. 6B13 & 6B13HV Functional Block Diagram

Designed for industrial applications, the 6B Series modules
incorporate transformer-based isolation with surface-mount
manufacturing technology – providing increased reliability at
low cost. The compact, rugged 6B Series analog modules can be
mixed and matched on a 16-channel backplane for high density,
remote process monitoring and control.

Communications between backplanes, modules and host is in
ASCII over an RS-232C link or RS-485 bi-directional serial bus.
Circuitry to convert RS-232C to RS485 is built into the 6B
backplane. Baud rates are software programmable, with speeds
up to 19.2 K Baud.

The 6B Series digital subsystem communication is compatible
with the overall 6B Series communication protocol. Each digital
I/O board can be configured for its address, baud rate and
checksum status. Connection to the 16 and 24-channel solid
state relay backplanes is by a 50-conductor ribbon cable. This
enables interfacing with input and outputs from 4 V to 240 V.
Power control modules are also available that can switch up to
3A and come with a variety of ratings for low voltage DC up to
280 VAC.

Rev. 0

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However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
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registered trademarks are the property of their respective companies.

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Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

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GENERAL DESCRIPTION

The 6B13 and 6B13HV are single-channel isolated signal­conditioning modules which accept outputs from platinum,
nickel and copper RTD sensors. Unlike conventional signal
conditioners, the 6B13 and 6B13HV are complete
microcomputer-based data acquisition systems. A major
advantage of the on-board microcontroller is its ability to be
remotely reconfigured for various sensor types and input
ranges.

Software Configuration – The 6B13 and 6B13HV linearize
100Ω platinum RTDs (alphas of 0.00385 and 0.003916), 120Ω
nickel RTDs and 10Ω copper RTDs. Software is used to
configure the 6B13 and 6B13HV modules for address, input
range, baud rate, data format, checksum status and integration
time. All programmable parameters are stored in the nonvolatile
memory of the module.

RTD sensor excitation current of 250 uA (2.25 mA for copper

.

6B13 / 6B13HV

RTDs) is supplied by a tracking pair of current sources. The
resulting analog input signal is conditioned and scaled by a
programmable-gain amplifier and digitized by a 16-bit
integrating converter under microprocessor control. The
digitized value is passed serially across a magnetically isolated
barrier (1500 V rms – Model 6B12; 2500 V rms – Model
6B13HV) and clocked in by a custom controller chip. The on­board microprocessor then converts the data into engineering
units or as a percentage of full scale, as determined by the
channel parameters. In between conversions, the
microprocessor auto zeros the offset and gain by monitoring the
on-board temperature and compensating for reference drift.
The 6B13 and 6B13HV use compensation factors to ensure the
highest accuracy possible.

.

Figure 2

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Models 6B13 and 6B13HV

Range Description

(Software Configurable)

Pt, -100°C to +100°C, α = 0.00385

6B13 / 6B13HV

Accuracy

(Typical)

±0.02°C ±0.15°C 0.03°C

Error

(Maximum)

Noise

(Peak-to-Peak)

Pt, 0°C to +100°C, α = 0.00385

Pt, -100°C to +200°C, α = 0.00385

Pt, -100°C to +600°C, α = 0.00385

Pt, -100°C to +100°C, α = 0.003916

Pt, 0°C to +100°C, α = 0.003916

Pt, 0°C to +200°C, α = 0.003916

Pt, 0°C to +600°C, α = 0.003916
Ni, -80°C to +100°C ±0.05°C ±0.15°C 0.02°C
Ni, 0°C to +100°C ±0.03°C ±0.15°C 0.02°C
Cu, (0 °C @ +25°C), 0°C to +120°C ±0.13°C ±1.4°C 0.04°C
Cu, (10 °C @ +25°C), 0°C to +120°C ±0.11°C ±1.4°C 0.04°C

±0.03°C ±0.15°C 0.04°C

±0.03°C ±0.15°C 0.04°C

±0.05°C ±0.15°C 0.05°C

±0.03°C ±0.15°C 0.03°C

±0.05°C ±0.15°C 0.03°C

±0.03°C ±0.15°C 0.04°C

±0.04°C ±0.15°C 0.05°C

6B13 and 6B13HV Specifications
(typical @ +25°C and Vs = +5 V dc)

Description Model 6B13 and 6B13HV

Inputs, Software Selectable

RTD Types

Temperature Ranges Refer to Model Table

Protocol RS-485
Baud Rates, Software Selectable 300 K, 600 K, 1.2 K, 2.4 K, 9.6 K, 19.2 K

Initial @ +25°C Refer to Model Table
Input Offset vs. Temperature ±0.005°C/°C
Span vs. Temperatur e ±0.005°C/°C

Sensor Excitation Current

100 Ω Pt; 120 Ω Ni

10

Ω Cu

Lead Wire Resistance, each lead

Platinum, 100
Nickel, 120 Ω
Copper, 10

Communications

Accuracy

0.25 mA

2.25 mA

10

Ω maximum

Lead Resistance Effect

Ω, α = 0.00385 or 0.003916

Ω

1

1

100 Ω Pt; 120 Ω Ni ±0.0007°C/Ω

10

Ω Cu ±0.01°C/Ω

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