Page 1
UU
F M
APPROVED
1
⁄16 DIN Limit Controller
CN6221 Series
Starts at
$
205
⻬ Dual Display
⻬ Universal Input
⻬ High or Low Limit
⻬ Digital Input for
Remote Reset
⻬ RS485 Communications
(Optional)
⻬ Alarms (Optional)
⻬ Retransmission Output
(Optional)
The CN6221 Series is an FM
approved limit controller that can be
configured either as a high limit or
as a low limit controller. The CN6221
features universal input, 2 alarm
outputs, retransmission output, a
timer to count the total time the
setpoint is exceeded, and a register
to retain the maximum. The RS485
communication interface is available
as an option.
Specifications
Power Supply
Voltage: 100 to 240 Vac (±10%),
Frequency: 50 or 60 Hz
Maximum Power Consumption:
8 Va max (4 W max)
Memory: Non-volatile memory
Withstanding Voltage (Between Primary
and Secondary Terminals): 1500 Vac
for 1 min (see Note 1)
Insulation Resistance (Between
Primary and Secondary Terminals):
20 MΩ or more at 500 Vdc (see Note 1)
Note 1: The primary terminals are the power
supply terminals and relay output terminals.
The secondary terminals are the analog input
and output terminals, the voltage pulse
output terminals, and the contact input
terminals.
Contact Input
Function: Resetting “exceeded status”
Input: 1 point
Type: Non-voltage contact
or transistor contact
Contact Capacity: At least 12V/10 mA
On/Off Judgment: On state for 1 kΩ or
less; off state for 20 kΩ or greater
Measured Value (PV)
Input: 1 point
Type: Universal; selectable by software
Accuracy (At 23 ±2°C Ambient
Temperature):
Thermocouple: ±2°C ±1digit
At -200 to -100°C: ±4°C
At -100 to 0°C: ±3°C
Types R and S: ±5°C [±9°C for
0 to 500°C (32 to 932°F)]
Type B: ±9°C (accuracy is not
guaranteed for 0 to 400°C)
RTD: ±1°C ±1digit
Voltage (mV, V): ±0.3% ±1digit
Sampling Period for Measured Value
Input: 500 ms
Burn-Out Detection: Functions for
thermocouple or RTD input (burn-out
upscale only; cannot be switched off)
Input Resistance: 1 MΩ or greater for
thermocouple or DC mV inputs; approx
1 MΩ for DC V input
Maximum Allowable Signal Source
Resistance: 250 Ω for thermocouple or
DC mV input; 2 kΩ for DC V input
Maximum Allowable Wiring
Resistance for RTD Input: 10 Ω/wire
(resistance values of 3 wires must be
the same)
Allowable Input Voltage: ±10 Vdc for
thermocouple or DC mV input; ±20 Vdc
for DC V input
Input Table
Input Type Range (°C) Range (°F)
-270 to 1370 -300 to 2500
-199.9 to 200 -300 to 400
-199.9 to 999.9 -300 to 2100
-199.9 to 400 -300 to 750
-199.9 to 999.9 -300 to 1800
-200 to 1300 -300 to 2400
-199.9 to 900 -300 to 1600
-199.9 to 400 -300 to 750
Platinel 2 0 to 1390 32 to 2500
-199.9 to 850 -199.9 to 999.9
RTD Thermocouple
DC
Voltage
Pt100
JPt100 -199.9 to 500
0 to 100 mV 0 to 100
0 to 5V 0 to 5
1 to 5V 1 to 5
0 to 10V 0 to 10
P-111
-199.9 to 200 -300 to 400
-19.9 to 99.9 -199.9 to 999.9
Panel Punches
Available Visit
omega.com/
panelpunches
CN6221-R, $205,
shown smaller
than actual size.
Noise Rejection Ratio:
Normal Mode Noise: Minimum
40 dB (50/60 Hz)
Common Mode Noise: Minimum
120 dB (90 dB for DC V input)
Reference Juction Error
Compensation: ±1.5°C (at 15 to 35°C),
±2.0°C (at 0 to 50°C)
Note: The reference junction compensation
cannot be switched off
Applicable Standards: RTD,
Thermocouple, JIS/IEC/DIN (ITS90)
0 to 600 32 to 999.9
0 to 400 32 to 750
0 to 1700 32 to 3100
0 to 1700 32 to 3100
0 to 1800 32 to 3200
0 to 400 32 to 750
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Control Output
Output: 1 point
Type: Relay contact
Contact Capacity: 3 A @ 240 Vac or
3 A @ 30 Vdc (with resistance load)
Note: The control output relay cannot be
replaced by users.
Alarm Functions (Optional)
Alarm Types: 22 types (waiting action
can be set by software): PV high-limit,
PV low-limit, deviation high-limit,
deviation low-limit, de-energized on
deviation highdlimit, deenergized on
deviation low-limit, deviation high- and
low-limits, high- and low-limits within
deviation, de-energized on PV high-limit,
de-energized on PV low-limit, fault
diagnosis output, fail output
Alarm Output: 2 relay contacts
Relay Contact Capacity: 1 A @ 240 Vac
or 1 A @ 30 Vdc (with resistance load)
Note: The alarm output relays cannot be
replaced by users.
Retransmission Output
(Optional)
The retransmission output is provided
only when the “/RET” option is specified.
Output Signal: Measured value in
4 to 20 mAdc
Maximum Load Resistance: 600 Ω
Output Accuracy: ±0.3% of span
(at 23 ±2°C ambient temperature)
Communication Interface
Applicable Standards: Complies with
EIA RS485
Number of Controllers: Up to 31
Maximum Communication Distance:
1200 m (3937')
Communication Method: 2-wire
half-duplex, start-stop synchronization,
non-procedural
Construction, Mounting, and
Wiring Construction:
and drip-proof front panel conforming to
IP65; for side-by-side close installation,
controller loses its dust-proof and dripproof protection
Casing: ABS resin and polycarbonate
Case Color: Black
Mounting: Flush panel mounting
Environmental Conditions
Normal Operating Conditions
Warm-Up Time: At least 30 minutes
Ambient Temperature: 0 to 50°C
(0 to 40°C when mounted side-by-side)
Rate of Change of Temperature:
10°C/h or less
Ambient Humidity: 20 to 90% RH
(no condensation allowed)
Magnetic Field: 400 A/m or less
Continuous Vibrations of 5 to 14 Hz:
Amplitude of 1.2 mm or less
Continuous Vibrations of 14 to 150 Hz:
4.9 m/s
2
(0.5 G) or less
Dust-proof
Short-Period Vibrations: 14.7 m/s
(1.5 G) for 15 seconds or less
Shock: 98 m/s
Mounting Angle: Upward incline of
up to 30 degrees; no downward incline
Altitude: ≤2000 m above sea level
Maximum Effects from Operating
Conditions
Temperature Effects
Thermocouple, mVdc and Vdc
Inputs: ±2 µV/°C or ±0.02% of
FS/°C, whichever is the larger
Resistance Temperature
Detector: ±0.05°C/°C
Analog Output: ±0.05% of FS/°C
Effect from Fluctuation of Power
Supply Voltage (Within Rated
Voltage Range)
Analog Input: ±0.2 µV/V or ±0.002%
of FS/V, whichever is larger
Analog Output: ±0.05% of FS/V
2
(10 G) for 11 ms or less
2
Transportation and Storage
Conditions
Temperature: -25 to 70°C (-13 to 158°F)
Humidity: 5 to 95% RH
(no condensation allowed)
Shock: Package drop height 90 cm (35")
(when packed in the dedicated package)
Dimensions: mm (in)
AVAILABLE FOR FAST DELIVERY!
To Order (Specify Model Number)
Model No. Price Description
CN6221-R $205 Limit controller, single relay output
Options
Ordering Suffix Add’l Price Description
-AL $20 Dual alarms
-PV 40 4 to 20 mA retransmission output
-C4* 95 RS485 communications
-DI * 20 Digital input switching
Only one option can be ordered.
*
Accessories (Field Installable)
Model No. Price Description
CNQUENCHARC $8 Noise suppression kit, 110 to 230 Vac
DPP-4 475
Comes complete with operator’s manual.
Ordering Example: CN6221-R-C4, single output limit controller, mechanical relay, RS485
communications, $205 + 95 = $300.
Recommended Reference Book: Grounding and Shielding Techniques,
EE-1319, $95, See Section Y For Additional Books
P-112
1
⁄
16 DIN panel punch
P
Page 3
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