Page 1
1
Extended Warranty
Program
SM
⁄8 DIN Vertical and 1⁄4 DIN
Universal Input Temperature/
Process Controllers
CN8240/CN8260
Starts at
$
339
Standard Features
⻬ Field-Configurable
Universal Temperature
and Process Inputs
⻬ Autotuning, Direct-
or Reverse-Acting
for Both Outputs
⻬ 8 Ramp and 8 Soak
Segments
⻬ User-Selectable
Ramp to Setpoint
⻬ Dual Output/Dual Alarm
Capabilities
⻬ Decimal Display in 0.1°
for Measured
Temperatures
Under 1000°C or °F
⻬ NEMA 4X Front Panel
Optional Features
⻬ Single or Dual Alarms
⻬ RS232 or 485 Digital
Communications
⻬ Remote Analog Setpoint
or Process Output
⻬ Contact/Digital Input
⻬ Transducer Excitation
⻬ PV or SV Retransmission
⻬ Low Voltage Power:
24 Vac/Vdc
OMEGACARESMextended warranty program is
available for models shown on this page. Ask
your sales representative for full details when
placing an order. OMEGACARESMcovers parts,
labor and equivalent loaners.
CN8241-R1, $339, shown
smaller than actual size.
The CN8240/CN8260 1⁄8 DIN vertical
and 1⁄4 DIN temperature/process
controllers are extremely versatile
and user-friendly. The user needs to
review only those parameters
relevant to the particular application
during setup. A dual digital display
offers optimal process information at
a glance. The dedicated upper
display shows the process value,
while the lower display shows setpoint
and setup parameters. Individual
LEDs identify the status of outputs,
alarms, digital communications, and
special options.
The CN8240/CN8260 features a
NEMA 4X front panel and a
universal power supply that accepts
100 to 250 Vac and 120 to 250 Vdc.
A 24 Vac/24 Vdc power supply
option is also available. Calibrations
for most thermocouples and RTDs
are available, as well as for millivolt
linear, volt linear, and current linear
inputs. Unlike the CN8200 1⁄16 DIN
models, these controllers have
plug-in output modules that can be
changed in the field. In addition, a
single-output model can be
P-60
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CN8261-R1, $401, shown
smaller than actual size.
converted to a dual-output version
in the field.
Available control algorithms are
P, PI, PD, PID, or on/off. The
autotune feature automatically sets
proportional band, derivative, and
integral before the process reaches
setpoint. These parameters provide
quick stabilization of processes with
minimum overshoot, hunting, or
cycling. Eight-level ramp/soak
control is standard, and includes
decimal display on thermocouple
ranges, digital display and signal
filtering, and a percentage of power
limit setting.
The dual control outputs can be
configured for a variety of control
applications, and an additional
2 dedicated alarm outputs are also
available. The CN8240/CN8260
offers a wide range of options,
including RS232 and RS485 digital
communications, a variety of remote
setpoint options, 3 contact/digital
input modes, 4 transducer
excitation voltages, and 4 auxiliary
output ranges.
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Page 2
Specifications
erformance
P
Accuracy: ±0.2% FS, ±1 digit
etpoint Resolution:
S
1 count/0.1 count
Repeatability: ±1 count
Temperature Stability:
5µV/°C (maximum)
T/C Cold-Junction Tracking:
0.05°C/°C ambient
ommon-Mode Rejection: 100 dB
C
Series Mode Rejection: >70 dB
Process Sampling: 10 Hz (100 ms)
Inputs
Input Type: See Input Ranges
Digital Input: For remote setpoint,
remote standby or ramp/soak run
and hold
Thermocouple Lead Resistance:
100 Ω max for rated accuracy
Decimal Position: Selectable
Outputs
Output #1: Reverse- or direct-acting,
configured from menu
Output #2: Reverse- or direct-acting,
configured from menu
Mechanical Relay: Rated 5 A @120
Vac, 3 A @ 240 Vac, NO, (output 1);
rated 5 A @ 120 Vac,
3 A @ 240 Vac, NO (output 2)
Current: 4 to 20 mA, 500 Ω max (F1,
F2); 4 to 20 mA, 1000 Ω max
(FH1, FH2)
Voltage: 20 Vdc pulse
Triac: SSR, 120/240 Vac,
zero voltage switched, rated 1 A
continuous, 10 A surge @ 25°C (77°F)
Alarms: Mechanical relay rated 5 A @
120 Vac, 3 A @ 240 Vac, NO
Control Characteristics
Setpoint Limits: Limited to
configured range for thermocouple and
RTD; limited to scaled range
Alarms: Adjustable for Hi/Lo; selectable
process or deviation
Rate (Derivative): 0 to 2400 seconds
Reset (Integral): 0 to 9600 seconds
Cycle Time: 0.2 to 120 seconds
Proportional Band:
1 to span of sensor
Deadband: Negative span to positive
span of sensor
Hysteresis: 1 to span of sensor
Autotune Damping: Adjustable (low,
normal or high)
Ramp to Setpoint: 1 to 9999 minutes
Autotune:
Operator-initiated from front panel
Manual Control:
Operator-initiated from front panel
General
Power: 100 to 250 V, 50/60 Hz
(single-phase); 120 to 250 Vdc,
24 Vac/24 Vdc (optional)
Power Consumption: Less than
6 VA (instrument) @ 120 Vac
Front-Panel Rating: NEMA 4X
1
⁄16 DIN versions are also available.
Refer to the CN8201 and CN8202
Series on page P-45 through P-47.
Input Ranges
Input Type Range
Iron-Constantan -200 to 760°C (-328 to 1400°F)
CHROMEGA®-ALOMEGA
opper-Constantan -270 to 400°C (-454 to 752°F)
C
OMEGALLOY
®
®
-270 to 1354°C (-454 to 2469°F)
-268 to 1300°C (-450 to 2372°F)
Pt/13%Rh - Pt -50 to 1768°C (-58 to 3214°F)
Pt/10%Rh - Pt -50 to 1768°C (-58 to 3214°F)
Pt/30%Rh - Pt/6%Rh 0 to 1820°C (32 to 3308°F)
W/5%Re - W/26%Re 0 to 2315°C (32 to 4199°F)
CHROMEGA®-Constantan -150 to 1000°C (-238 to 1832°F)
NNM (nickel-18% molybdenum, 0 to 1410°C (32 to 2570°F)
vs. nickel -0.8% cobalt)
Platinel II -100 to 1232°C (-148 to 2250°F)
3-wire, 100 Ω PT -200 to 850°C (-328 to 1562°F)
3-wire, 100 Ω PT -199.9 to 375.0°C (-199.9 to 707.0°F)
0 to 1V Scalable (-1999 to 9999) selectable
1 to 5V Scalable (-1999 to 9999) selectable
0 to 5V Scalable (-1999 to 9999) selectable
0 to 10V Scalable (-1999 to 9999) selectable
10 to 50 mV Scalable (-1999 to 9999) selectable
0 to 50 mV Scalable (-1999 to 9999) selectable
0 to 10 mV Scalable (-1999 to 9999) selectable
0 to 100 mV Scalable (-1999 to 9999) selectable
4 to 20 mA Scalable (-1999 to 9999) selectable
0 to 20 mA Scalable (-1999 to 9999) selectable
Operating Ambient Range:
0 to 55°C (32 to 131°F) @ 90% RH
max, non-condensing
Memory Protection:
Solid state non-volatile memory
Connections: Screw terminals
Contacts: Twin bifurcated
1
⁄8 DIN CN8240 Specifications
Display: Dual LED, 4-digit, 9.2 mm
(0.36"), orange-process display and
green-menu/parameter display
Panel Cutout:
92 x 46 mm (3.60 x 1.8")
Dimensions:
100.33 H x 53.3 W x 18.2 mm D bezel
(3.95 x 2.10 x 0.72")
Depth Behind Panel:
100 mm (3.937")
CN8240 Series Weight:
340 g (12 oz)
1
⁄4 DIN CN8260 Specifications
Display: Dual LED, 4-digit orange
process display, 14 mm (0.55"),
green-menu/parameter display,
9.2 mm (0.36")
Panel Cutout: 92 mm (3.60") square
Dimensions:
100.33 H x 100.33 W x 18.2 mm D bezel
(3.95" x 3.95" x 0.72")
Depth Behind Panel:
100 mm (3.937")
CN8260 Series Weight:
425 g (15 oz)
P-61
Page 3
1
⁄8 DIN Models
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
Model Number Price Description
CN8241-(*) $339 Single-output ramp/soak controller
CN8242-(*)-(*) 369 Dual-output ramp/soak controller
Comes complete with operator’s manual.
Specify output type from output options table.
*
Ordering Example: CN8241-R1, 1⁄8 DIN controller with single relay output, $339.
OCW-3, OMEGACARESMextends standard 2-year warranty to a total of 5 years ($84), $339 + 84 = $423.
1
⁄4 DIN Models
Model Number Price Description
CN8261-(*) $401 Single-output ramp/soak controller
CN8262-(*)-(*) 431 Dual-output ramp/soak controller
Comes complete with operator’s manual.
Specify output type from output options table.
*
Ordering Example: CN8261-R1,1⁄4 DIN single mechanical relay output ramp/soak process controller, $401.
Output Options—No Additional Cost
Option Type
First Output Second Output
Order Suffix Order Suffix
Relay -R1 -R2
DC Pulse -DC1 -DC2
1A SSR -T1 -T2
4 to 20 mA
(500 Ω max)
4 to 20 mA
(800 Ω max)
-F1 -F2
-FH1 -FH2
Alarm Options
Ordering
Suffix Price Description
-AL1 $25 Single alarm relay
-AL2 50 Dual alarms
Communications Options
Ordering
Suffix Price Description
-C2 $95 RS232 communications
-C2-MOD 125 RS232 with MODBUS®protocol
-C4 95 RS485 communications
-C4-MOD 125 RS485 with MODBUS protocol
Transducer Power Supply Options
Ordering
Suffix Price Description
-XP1 $75 Transducer power supply, 15 Vdc
-XP2 75 Transducer power supply, 12 Vdc
-XP3 75 Transducer power supply, 10 Vdc
-XP4 75 Transducer power supply, 5 Vdc
Optional Power Supply
Ordering
Suffix Price Description
-LV $40 24 Vac/Vdc
Optional Communications Software
Model No. Price Description
CN8-SW N/C Remote monitoring and control software
Includes 2 folders—1 for standard and 1 for MODBUS protocol.
CN0-SW software available, visit omega.com/cn8240
Accessories (Field Installable)
Model
Number Price Description
CN8500-R $35 Relay output module
CN8500-DC 35 DC pulse output module
CN8500-T 35 AC SSR output module
CN8500-F 35
4 to 20 mA (500 Ω max)
output module
CNQUENCHARC 8 Noise suppression RC
snubber (2 leads),
110 to 230 Vac
CN8241-R1, $339.
Shown smaller
than actual size.
Process Output Options
(Only One Option Can Be Ordered)
Ordering
Suffix
-PVSV1 $75
-PVSV2 75
Price Description
Process output, PV or SV,
4 to 20 mA
Process output, PV or SV,
0 to 5 Vdc
-DIC 75 Digital input switch closed
-RSP4 75 Remote setpoint, 0 to 5 Vdc
-RSP5 75 Remote setpoint, 1 to 5 Vdc
-RSP6 75 Remote setpoint, 0 to 20 mA
-RSP7 75 Remote setpoint, 4 to 20 mA
P-62
CN8261-R1, $401.
P
Page 4
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