MODEL: 27HU

27HU SPECIFICATIONS

ES-7651 Rev.17 Page 2/5

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

Input resistance: ≥ 1 MΩ

Burnout sensing: 33 μA

External CJC sensor type: Pt 100

■ RTD (2-wire, 3-wire or 4-wire)

Input resistance: ≥ 1 MΩ

Excitation: 0.2 mA

Allowable leadwire resistance: Max. 10 Ω per wire

■ Resistance (2-wire, 3-wire or 4-wire)

Input resistance: ≥ 1 MΩ

Excitation: 0.2 mA

Allowable leadwire resistance: Max. 10 Ω per wire

OUTPUT SPECIFICATIONS

Output range: 4 – 20 mA DC

Operational range: 3.75 – 23 mA

Load resistance vs. supply voltage:

Load Resistance (Ω) = (Supply Voltage (V) – 8 (V))

÷ 0.023 (A)

(including leadwire resistance)

Burnout: 3.75 – 3.8 mA or 21.5 – 23 mA

(factory set to 23 mA)

Upper output limit proportional to the input:

20 – 21.5 mA (factory set to 21.5 mA)

Lower output limit proportional to the input:

3.8 – 4 mA (factory set to 3.8 mA)

Update time: 440 msec. (660 msec. with dual input)

Output characteristics for dual input:

Average or Differential selectable

INSTALLATION

Supply voltage

• 8 – 35 V DC (non-approved)

• 8 – 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: Head-mounting (DIN type B head)

Weight: 50 g (1.76 oz)

PERFORMANCE

Accuracy: See Table 1.

Cold junction compensation accuracy: ±0.5°C (±0.9°F) with

internal CJC sensor

Response time: ≤ 2 sec. (0 – 90 %) with damping time

set to 0 and when not communicating via HART.

Supply voltage effect: ±0.005 % of span/V

Insulation resistance: ≥ 100 MΩ with 500 V DC

Dielectric strength: 1500 V AC @1 minute (input to output)

Safety integrity level according to IEC 61508: Suitable for

use in a safety instrumented system up to SIL2 (together

with sensor) if appropriate safety instructions are observed.

Consult M-System.

STANDARDS & APPROVALS

EU conformity:

ATEX Directive

Ex ia EN 60079-11

EMC Directive

EN 61326-1

RoHS Directive

EN 50581

Safety approval:

FM: Intrinsically safe

Class I, Division 1, Groups A, B, C and D

Class I, Zone 0, AEx ia IIC (US)

Class I, Zone 0, Ex ia IIC (Canada)

T4, T5 and T6

(Class 3610, ANSI/ISA 60079-11,

CAN/CSA-C22.2 No. 157,

CAN/CSA-C22.2 No. 60079-11)

ATEX: Intrinsic safety

II 1G, Ex ia IIC; T4, T5 and T6

(EN 60079-0)

(EN 60079-11)

SAFETY PARAMETERS

Operating temperature

For ATEX / FM:

T4: -40 to +80°C

T5: -40 to +60°C

T6: -40 to +45°C

Ex-data:

• Output circuit

Ui (Vmax): 30 V DC

Ii (Imax): 96 mA DC

Pi (Pmax): 720 mW

Ci: 1 nF

Li: 0 mH

• Sensor circuit

Uo (Voc): 30 V DC

Io (Isc): 24 mA DC

Po: 180 mW

Co (Ca): 50 nF

Lo (La): 40 mH