27U 2-WIRE UNIVERSAL TEMPERATURE TRANSMITTER

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27U 2-WIRE UNIVERSAL TEMPERATURE TRANSMITTER
(PC programmable)

Functions & Features
• Universal input: mV, T/C, RTD and resistance
• Suitable for Functional Safety applications up
to SIL2
• Programming via PC Configurator
• A wide variety of T/C and RTD types
• User’s temperature table can be used
• Self diagnostics
• Low temperature drift
• CE marking (conforms to ATEX and EMC)

MODEL: 27U–[1]

ORDERING INFORMATION
• Code number: 27U-[1]
Specify a code from below for [1].
(e.g. 27U-0)
Use Ordering Information Sheet (No. ESU-7656). 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.

[1] SAFETY APPROVAL
0: None
1: FM intrinsically safe
2: CENELEC intrinsic safety (ATEX)

RELATED PRODUCTS
• USB interface Bell202 modem (model: COP-HU)
Usable in ‘non-hazardous’ area only.
• PC configurator software (model: 27MCFG)
Downloadable at M-System’s web site.

GENERAL SPECIFICATIONS
Construction: Sensor head-mounting
Connection: M3 screw terminals (torque 0.5 N·m)
Screw terminal: Nickel-plated brass
Housing material: Flame-resistant resin (black)
Isolation: Input to output
Cold Junction Compensation: CJC sensor incorporated
Self diagnostics: Detects internal error, burnout
User-configurable items: PC and the transmitter are connected with the COP-HU.
· Input sensor type
· Input range
· Burnout
· Output limits (Upper / Lower)
· Damping time (factory set to 0)
· Linearization
· Output calibration
· Loop test output

INPUT SPECIFICATIONS
The input is factory set for use with K thermocouple, single input, 0 to 100°C.
See Table 1 for the available input type, the minimum span and the maximum range.
■ DC mV
Input resistance: ≥ 1 MΩ
■ Thermocouple (dual input available)
Input resistance: ≥ 1 MΩ
■ RTD (2-wire, 3-wire or 4-wire)
Input resistance: ≥ 1 MΩ
Excitation: ≤ 0.25 mA
Allowable leadwire resistance: Max. 10 Ω per wire
■ Resistance (2-wire, 3-wire or 4-wire)
Input resistance: ≥ 1 MΩ
Excitation: 0.25 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) – 9 (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
· 9 – 35 V DC (non-approved)
· 9 – 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: As indicated in Table 1, ±0.075 % of span
or ±0.075 % of max. range, whichever is the greatest.
Add the CJC error for T/C input.
(max. range = 0 % or 100 % value, absolute value of
whichever is greater.)
Cold junction compensation error: ±0.5°C (±0.9°F)
Temp. coefficient: 0.0075 %/°C (0.004 %/°F) of max. range
(max. range = 0 % or 100 % value, absolute value of
whichever is greater.)
Response time: ≤ 1 sec. (0 – 90 %) or ≤ 2 sec. (4-wire RTD,
4-wire resistance or dual input T/C; 0 – 90 %) with damping time set to 0
Supply voltage effect: ±0.01 % 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
EMI EN 61000-6-4
EMS EN 61000-6-2
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)

SAFETY PARAMETERS
Operating temperature
For CENELEC (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