Field-mounted Two-wire Signal Conditioners
B6-UNIT SERIES

2-WIRE UNIVERSAL TEMPERATURE TRANSMITTER

(HART communication, intrinsically safe/explosion-proof)
Functions & Features
• Universal input: mV, V, T/C, RTD, resistance and potentiometer
• High accuracy
• HART communication
• Intrinsically safe and explosion-proof approval
• Functional safety approval
• Optional stainless steel enclosure
• Programming via hand-held communicator or via PC
• A wide variety of T/C and RTD types
• User’s temperature table can be used
• Self diagnostics
• Input-output isolated

MODEL: B6U–B–[1][2][3][4][5]

ORDERING INFORMATION

• Code number: B6U-B-[1][2][3][4][5]
Specify a code from below for each of [1] through [5].
  (e.g. B6U-B-4121)
Use Ordering Information Sheet (No. ESU-7451). Factory
standard setting will be used if not otherwise specified.
Specify the country in which the product is to be used with
the Safety Approval code 2 or 4.

[1] SAFETY APPROVAL

0: None (functional safety not available)
1: FM intrinsically safe
2: IECEx/ATEX intrinsic safety
3: FM explosion-proof
4: IECEx/ATEX flameproof
5: FM nonincendive
Confirm selectable combinations of approval and wiring conduit types in the table.

[2] LCD DISPLAY

0: Without
1: With

[3] WIRING CONDUIT

0: G 1/2
1: 1/2 NPT
2: M20 × 1.5
3: PG 13.5
Confirm selectable combinations of approval and wiring conduit types in the table.

[4] MOUNTING BRACKET

0: Without
1: With

[5] OPTIONS

Enclosure Materials
Blank: Diecast aluminium enclosure
/S: Stainless steel enclosure

RELATED PRODUCTS

• USB interface Bell202 modem (model: COP-HU)
Usable in ‘non-hazardous’ area only.
• Hand-held communicator
• AMS (version 6.0 or higher)
• PC configurator software (model: B6UCFG)
Downloadable at our web site.
• LCD display (model: B6U-LCD) (non safety approval)
• Lightning Surge Protectors for Electronics Equipment (Model: MD6x-24)
Refer to the specification of MD6x-24 for surge protection and safety approval.

PACKAGE INCLUDES...

• Mounting screws
     Bolt (M8 x 15): 4 pcs.
     Spring washer for M8: 4 pcs.
  Material: Stainless steel 304
• Mounting bracket set (option)
     Mounting bracket: 1 pce.
     M10 U-bolt: 2 pcs.
     Nut for M10: 4 pcs.
     Spring washer for M10: 4 pcs. 
  Material: Stainless steel 304
  Applicable pipe: 1 1/2” min.; 2” max.
• LCD Angle Change Adaptor (for optional LCD display):
     Adaptor plate: 1 pce.
     Flat head screw (M4 x 10): 2 pcs.

GENERAL SPECIFICATIONS

Degree of protection: NEMA 4X, IP66/IP67
Wiring conduit: See ‘Ordering information.’
Electrical connection: M3.5 screw terminals (torque 0.8 N·m)
Materials
Transmitter housing: Flame-resistant resin (black)
Screw terminals: Nickel-plated brass
Enclosure: Diecast aluminium standard or stainless steel
casting (equivalent to type 316);
silver epoxy resin coating
Isolation: Input to output to outdoor enclosure
Burnout (T/C, RTD, Potentiometer & Resistance): Upscale, downscale or no burnout selectable (standard: upscale);
Also detects wire breakdown and overrange input exceeding the electrical design limit for DC input.
Cold Junction Compensation (thermocouple input): CJC sensor incorporated
User-configurable items:
· Input sensor type
· Number of wires (RTD & resistance)
· Input range
· Inverted output
· Burnout
· Damping time (via HART only, standard: 0)
· Sensor calibration (via HART only)
· Output calibration
· Special linearization data (via HART only)
· HART communication mode

HART COMMUNICATION

Protocol: HART communication protocol
HART address range: 0 – 15 (factory set to 0)
Transmission speed: 1200 bps
Digital current: Approx. 1 mAp-p when communicating
Character format: 1 Start Bit, 8 Data Bits, 1 Odd Parity Bit,
1 Stop Bit
Distance: 1.5 km (0.9 miles)
HART communication mode: Master-Slave Mode and Burst Mode (factory set to Master-Slave)
HART network mode: Point-to-Point Mode and Multi-drop Mode; automatically set to Multi-drop Mode when the address is set to other than 0.

LCD DISPLAY (option)

Features:
· Setting and display of input signals, engineering units and the transmitter operating status, etc.
· Removable while the module is powered.
Display size: 36 × 20 mm (1.42” × 0.79”)
Characters
Color: Black
Format:
• 2 rows of 5 alphanumeric characters:
  Top row: 7.4 mm high;
  Bottom row: 6.5 mm high,
• Status indicators and engineering units
For detail of the LCD panel indication, refer to the instruction manual.   
Display range: -99999 to 99999
Decimal point: In top row
Read rate: 150 msec.
Back light: None

INPUT SPECIFICATIONS

The input type is factory-set to K thermocouple, and the input range to 0 to 100°C.
See Table 1 for the available input type, the minimum span, and the maximum range.
■ DC mV & V
Input resistance: ≥ 1 MΩ
■ Thermocouple
Input resistance: ≥ 1 MΩ
Burnout sensing: 130 nA ±10 %
■ RTD (2-wire, 3-wire or 4-wire)
Input resistance: ≥ 1 MΩ
Allowable leadwire resistance: Max. 20 Ω per wire
■ Resistance (2-wire, 3-wire or 4-wire)
Excitation: 0.2 mA ±10 %
Allowable leadwire resistance: Max. 20 Ω per wire
■ Potentiometer
Excitation: 0.2 mA ±10%
Allowable leadwire resistance: Max. 20 Ω per wire

OUTPUT SPECIFICATIONS

Output range: 4 – 20 mA DC
Operational range: 3.8 – 21.6 mA
Load resistance vs. supply voltage:
Load Resistance (Ω) = (Supply Voltage (V) – 12 (V))
÷ 0.024 (A)      (including leadwire resistance)

INSTALLATION

Supply voltage
 • 12 – 42 V DC (non-approved)
 • 12 – 28 V DC (approved)
Operating temperature: 
 · Non-safety-approved unit: -40 to +85℃ (-40 to +185°F) 
 · Safety-approved unit: See Safety Parameters for use in a hazardous location.
 · LCD display (full visibility): -30 to +80℃ (-22 to +176°F)
Weight: 
· Unit
  Approx. 1.3 kg (2.9 lb), aluminium
  Approx. 4.0 kg (8.8 lb), stainless steel
· Mounting bracket set (option)
  Approx. 0.78 kg (1.72 lb)

PERFORMANCE

Accuracy: See Table 1 and ‘Explanations of Terms.’
Cold junction compensation error: ±0.5℃ (±0.9°F)
Temp. coefficient: ±0.015 %/°C (±0.008 %/°F) of max. span at -5 to +55°C [23 to 131°F]
Start-up time: Approx. 8 sec.
Response time: ≤ 2 sec. (0 – 90 %) with damping time
set to 0 and when not communicating via HART.
Supply voltage effect: ±0.003 % × [Output Span] / 1 V
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 1500 V AC @1 minute
(input to output to outdoor enclosure)
Safety integrity level: Suitable for use in a safety instrumented system up to SIL1 or SIL2 if appropriate safety instructions are observed. Consult us.

EXPLANATIONS OF TERMS

■ ACCURACY
This transmitter’s accuracy is theoretically defined as the addition of A/D and D/A conversion errors:

  Accuracy = A/D Conversion Error + D/A Conversion Error

The A/D conversion error means that measured as HART signal which is A/D converted from the analog input signal.
The D/A conversion error of this transmitter is relatively very small so that it does not really affect the unit’s overall performance.
The “Accuracies” given in Table 1 therefore equals the A/D conversion error.
The temperature drift (coefficient) or the cold junction compensation error is not included in the “Accuracy.”
■ CALCULATION EXAMPLES OF OVERALL ACCURACY IN %
• DC Voltage
1) 0 – 200 mV
Absolute value accuracy (Table 1): 40 μV
40 μV ÷ 200000 μV × 100 = 0.02 % < 0.1 %
➠ Overall accuracy = ±0.1% of span
2) 0 – 4 mV
Absolute value accuracy (Table 1): 10 μV
10 μV ÷ 4000 μV × 100 = 0.25 % > 0.1%
➠ Overall accuracy = ±0.25 % of span
• Thermocouple
1) K thermocouple, 0 – 1000°C
Absolute value accuracy (Table 1): 0.25°C
0.1% × 1000°C = 1°C > 0.25°C
CJC error (0.5°C) added: 1 + 0.5 = 1.5°C
1.5°C ÷ 1000°C × 100 = 0.15 %
➠ Overall accuracy including CJC error = ±0.15 % of span
2) K thermocouple, 50 – 150°C
Absolute value accuracy (Table 1): 0.25°C
0.1 % × (150 – 50)°C = 0.1°C < 0.25°C
CJC error (0.5°C) added: 0.25 + 0.5 = 0.75°C
0.75°C ÷ (150 – 50)°C × 100 = 0.75 %
➠ Overall accuracy including CJC error = ±0.75 % of span
• RTD
1) Pt 100, -200 – 800°C
Absolute value accuracy (Table 1): 0.15°C
0.15°C ÷ (800 – -200)°C × 100 = 0.015 % < 0.1 %
➠ Overall accuracy = ±0.1 % of span
2) Pt 100, 0 – 100°C
Absolute value accuracy (Table 1): 0.15°C
0.15°C ÷ 100°C × 100 = 0.15 % > 0.1 %
➠ Overall accuracy = ±0.15 % of span

STANDARDS & APPROVALS

EU conformity:
ATEX Directive 
  Ex ia EN 60079-11 (for ATEX intrinsic safety)
  Ex db EN 60079-1 (for ATEX flameproof)
EMC Directive 
  EMI EN 61000-6-4
  EMS EN 61000-6-2

RoHS Directive
Safety approval:
FM: Intrinsically safe
  Class I, Division 1, Groups A, B, C and D
  Class II, Division 1, Groups E, F and G
  Class III, Division 1
  Class I, Zone 0, AEx ia IIC
  T4, T5 and T6
  (Class 3600)
  (Class 3610)
  (ANSI/ISA 60079-0)
  (ANSI/ISA 60079-11)
FM: Explosion-proof and Dust-ignition proof
  Class I, Division 1, Groups B, C and D
  Class II, Division 1, Groups E, F and G
  Class III, Division 1
  T6
  (Class 3600)
  (Class 3615)
FM: Nonincendive
  Class I, Division 2, Groups A, B, C, and D
  Class II, Division 2, Groups F and G
  Class III, Division 1
  Class I, Zone 2, Group IIC
  T4, T5 and T6
  (Class 3600)
  (Class 3611)
IECEx intrinsic safety
  Ex ia IIC T4, T5 and T6 Ga
  (IEC 60079-0)
  (IEC 60079-11)
IECEx flameproof
 Ex db IIC T4, T5 and T6 Gb
 (IEC 60079-0)
 (IEC 60079-1)
KOSHA: flameproof (Occupational Safety and Health Act)
  Ex d IIC T6
  (Only available for Model: B6U-B-41****)

Functional safety
  (SIL 1 @ IEC 61508-1, -2)
  (SIL 2 @ IEC 61511-1)
* Safety approval code "0" is not applicable.

SAFETY PARAMETERS

Operating temperature
For IECEx, ATEX and FM:
  T4: -40 to +80°C
  T5: -40 to +65°C
  T6: -40 to +50°C (-40 to +80°C for FM explosion-proof)
Ex-data:
• Output circuit
  Ui (Vmax): 30 V
  Ii (Imax): 96 mA
  Pi (Pmax): 720 mW
  Ci: 0 μF
  Li: 0 mH 
• Sensor circuit
  Uo (Voc): 6.4 V
  Io (Isc): 30 mA
  Po: 48 mW
  Co (Ca): 20 μF
  Lo (La): 10 mH

INPUT TYPE, RANGE & ACCURACY

EXTERNAL DIMENSIONS unit: mm [inch]

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM