MODEL: B3HU

B3HU SPECIFICATIONS

ES-7502 Rev.14 Page 2/5

http://www.m-system.co.jp/

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)

Excitation: 0.2 mA ± 10 %

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: -40 to +85°C (-40 to +185°F)

(See Safety Parameters for use in a hazardous location.)

Operating humidity: 0 to 95 %RH (non-condensing)

Mounting: DIN rail

Weight: 80 g (2.8 oz)

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 ground)

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