ES-7653 Rev.10
27RS
Head-mounted Two-wire Signal Conditioners
27-UNIT
RTD TRANSMITTER
(PC programmable)
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: 27RS–[1][2]
ORDERING INFORMATION
• Code number: 27RS-[1][2]
Specify a code from below for each of [1] and [2].
(e.g. 27RS-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
: ATEX intrinsic safety
(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 our 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
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)
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
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 us.
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
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 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)
EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]
MOUNTING REQUIREMENTS unit: mm [inch]
SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM