·Some details are not shown. Please refer to specification sheets for all information.

27R

Head-mounted Two-wire Signal Conditioners
27-UNIT

RTD TRANSMITTER
(PC programmable; non-isolated)

Functions & Features
• Accepts direct input from an RTD and provides
a standard 4 – 20 mA DC signal
• Suitable for Functional Safety applications up
to SIL2
• I/O range programming via PC Configurator
• User’s temperature table can be used
• Self diagnostics
• Low temperature drift

MODEL: 27R–[1][2]

ORDERING INFORMATION
• Code number: 27R-[1][2]
Specify a code from below for each [1] and [2].
(e.g. 27R-0/M)
Use Ordering Information Sheet (No. ESU-7653). 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
  (Option code /M is not selectable)
2: CENELEC intrinsic safety (ATEX)
  (Option code /M is not selectable)

[2] OPTIONS
Function Monitor LED
Blank: Without
/M: With

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)
Function monitor LED: Input status and error status are displayed by blinking mode.
User-configurable items: PC and the transmitter are connected with the COP-HU.
· Input sensor type
· Number of wires
· 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 Pt 100 (JIS ’97, IEC),
0 to 100°C.
RTD (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) – 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.

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: ±0.15°C (±0.27°F), ±0.075 % of span or
±0.075 % of max. range, whichever is greater
(max. range = 0 % or 100 % value, absolute value of
whichever is greater.)
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. (2- or 3-wire; 0 – 90 %) or
≤ 2 sec. (4-wire; 0 – 90 %) with damping time set to 0
Burnout response time: ≤ 2 sec.
Supply voltage effect: ±0.01 % of span/V
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

FUNCTION MONITOR LED (option /M)

DIMENSIONS unit: mm (inch)

MOUNTING REQUIREMENTS unit: mm (inch)

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM

M-System Co., Ltd.