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Head-mounted Two-wire Signal Conditioners 26-UNIT
RTD TRANSMITTER
26RS
MODEL
(isolated)
MODEL & SUFFIX CODE SELECTION
26RS–❑❑
ORDERING INFORMATION
Specify code number and variables.
•Code number (e.g. 26RS-4/K/BL)
•Temperature range (e.g. 0 – 100°C)
GENERAL SPECIFICATIONS
Construction: Sensor head-mounting
Connection: Terminal block
Housing material: Flame-resistant resin (black)
Adjustments: ±1% for zero and span (front)
Burnout protection: Upscale standard; downscale
optional
Linearization: Standard
43.5 (1.71) DIA.
5
4
3
2
1
26.5
(1.04)
mm (inch)
Functions & Features
• Accepts direct input from an RTD and providesa
standard 4 – 20mA DC signal
• Linearization
• Burnout protection
• Wide operating temperature range suitable for
harsh environments
Typical Applications
• Mounting in a sensor connection head minimizes
the noise effect and signal degradation
INPUT & OUTPUT
Maximum leadwire resistance: 20Ω per wire (3-wire)
Sensing current: 0.7mA (Pt); 0.35mA (Ni 508.4Ω)
Temperature range
USABLE RANGE
RTD
JPt 100 (JIS ’89)
Pt 100 (JIS ’89)
Pt 100 (JIS ’97/DIN/IEC)
Pt 50Ω (JIS ’81)
Ni 508.4Ω
°C
°F
-200 to +500
-200 to +650
-200 to +850
-200 to +500
-50 to +200
-328 to +932
-328 to +1202
-328 to +1562
-328 to +932
-58 to +392
MIN. SPAN
°C
°F
50
90
50
90
50
90
100 180
30
54
■OUTPUT: 4 – 20mA DC
Load resistance vs. supply voltage:
Supply Voltage (V) – 12 (V)
0.02 (A)
(including leadwire resistance)
Load Resistance (Ω) =
1000
LOAD RESISTANCE [Ω]
MODEL
INPUT RTD (2- or 3-wire)
1 : JPt 100 (JIS ’89)
3 : Pt 100 (JIS ’89)
4 : Pt 100 (JIS ’97, DIN, IEC751)
5 : Pt 50Ω (JIS ’81)
6 : Ni 508.4Ω
OUTPUT
4 – 20mA DC
SUPPLY VOLTAGE
12 – 32V DC
OPTIONS
/K : Fast response
/BL : Downscale burnout
800
600
400
200
0
10 12
15
20
25
30 32
SUPPLY VOLTAGE [V]
(600Ω maximum at 24V DC)
P. 1 / 2
ES-4266
26RS
INSTALLATION
PERFORMANCE in percentage of span
Supply voltage: 12 – 32V DC
Operating temperature: -40 to +85°C (-40 to 185°F)
Operating humidity: 0 to 90% RH (non-condensing)
Mounting: Head-mounting (DIN type B head)
Dimensions: ø43.5×D26.5 mm (ø1.71"×1.04")
Weight:
20 g (0.7 oz)
Accuracy: ±0.2%
Temp. coefficient: ±0.02%/°C (±0.01%/°F)
Response time: ≤0.5 seconds (0 – 90%)
approx. 25 milliseconds with option /K
Burnout response: ≤10 seconds
Insulation resistance: ≥100MΩ with 500V DC
Dielectric strength: 2000V AC @1 minute
(input to output to ground)
STANDARDS & APPROVALS
CE conformity: EMC Directive (89/336/EEC)
EMI EN61000-6-4
EMS EN61000-6-2
SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM
Burnout
RTD
A
3
B
2
B
1
Z
Reference
Resistor
+ Differential
–
Amplifier
Constant
Current
S
Isolation
Voltage
Amplifier
Output
Driver
24VDC
4 +
OUTPUT LOAD
5 –
4 – 20mADC
Linearizer
EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENT mm (inch)
26.5 (1.04)
43.5 (1.71)
ZERO ADJ.
15.5 (.61)
33 (1.30)
7.0 (.28) dia.
SPAN ADJ.
2–4.2 (.17) dia. MTG HOLE
1
2
3
4
5
MOUNTING REQUIREMENTS mm (inch)
2–4.2 (.17) dia. MTG HOLE
M4 SCREWS
33 (1.30)
Specifications subject to change without notice.
P. 2 / 2
ES-4266