Functional Description

6B13/HV6B13 The 6B13 and 6B13HV are single-channel isolated signal-conditioning 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 100 Ω platinum RTDs (alphas of 0.00385 and 0.003916), 120 Ω nickel RTDs and 10 Ω 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.

Inside the 6B13 and 6B13HV

RTD sensor excitation current of 250 µA (2.25 mA for copper 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 6B13; 2500 V rms - Model 6B13HV) and clocked in by a custom controller chip. The on-board 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 1. 6B13 and 6B13HV Functional Block Diagram

6B13/6B13HV MCD

Figure 2. 6B13 and 6B13HV Field Connection Diagram


100 Ω Platinum RTDs

120 Ω Nickel RTDs

10 Ω Copper RTDs


RS-485 Interface

Models 6B13 and 6B13HV

Range Description
(Software Configurable)
Pt, -100°C to +100°C, α = 0.00385 ±0.02°C ±0.15°C 0.03°C
Pt, 0°C to +100°C, α = 0.00385 ±0.03°C ±0.15°C 0.04°C
Pt, -100°C to +200°C, α = 0.00385 ±0.03°C ±0.15°C 0.04°C
Pt, -100°C to +600°C, α = 0.00385 ±0.05°C ±0.15°C 0.05°C
Pt, -100°C to +100°C, α = 0.003916 ±0.03°C ±0.15°C 0.03°C
Pt, 0°C to +100°C, α = 0.003916 ±0.05°C ±0.15°C 0.03°C
Pt, 0°C to +200°C, α = 0.003916 ±0.03°C ±0.15°C 0.04°C
Pt, 0°C to +600°C, α = 0.003916 ±0.04°C ±0.15°C 0.05°C
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 � @ +25°C), 0°C to +120°C ±0.13°C ±1.4°C 0.04°C
Cu, (10 � @ +25°C), 0°C to +120°C ±0.11°C ±1.4°C 0.04°C

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

Description Model 6B13 and 6B13HV
Inputs, Software Selectable
RTD Types Platinum, 100 Ω, α = 0.00385 or 0.003916
Nickel, 120 <Ω
Copper, 10 Ω
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/°C1
Span vs. Temperature ±0.005°C/°C1
Sensor Excitation Current
100 Ω Pt; 120 Ω Ni 0.25 mA
10 Ω Cu 2.25 mA
Lead Wire Resistance, each lead 10 Ω maximum
Lead Resistance Effect
100 Ω Pt; 120 Ω Ni ±0.0007°C/Ω
10 Ω Cu ±0.01°C/Ω
Bandwidth, -3 dB 4 Hz
Conversion Rate 9 samples/second
Common-Mode Voltage (CMV)
Input-to-Output and Power
Model 6B13 1500 V rms, continuous
Model 6B13HV 2500 V rms, continuous
Common Mode Rejection (CMR)
1 kΩ Source Imbalance @ 50/60 Hz 160 dB
Normal Mode Rejection (NMR)
1 kΩ Source Imbalance @ 50/60 Hz 56 dB
Input Protection 240 V dc, continuous
Input Transient Protection ANSI/IEEE C376.90.1-1989
Power Supply
Voltage, Operating +5 V dc ±5%
Voltage, maximum safe limit +6.5 V dc
Current +100 mA
Mechanical Dimensions 2.3" x 3.1" x 0.79"
(58.4 mm x 78.7 mm x 19.1 mm)
Temperature Range
   Rated Performance -25°C to +85°C
   Operating -25°C to +85°C
   Storage -40°C to +85°C
Relative Humidity, 24 hours 0 to 95% @ +60°C noncondensing
1 Combined effect of zero drift and spna drift.
Specifications subject to change without notice.
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