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, Optional 2 alarm
outputs, Optional 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 Note1)
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 12 V/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
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 (X to X°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
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)
The reference junction compensation cannot be switched off
Applicable Standards: RTD, Thermocouple, JIS/IEC/DIN (ITS90)
† All dollar amounts on this site are shown in US currency.
Note: Comes with complete operator’s manual. Ordering Example: (1) CN6221-R-C4 Single output limit controller, mechanical relay, RS485 communications, $320.00
Part Number Builder
Select Nothing(leave field blank) for none -AL for Dual alarms -PV for 4 to 20 mA retransmission output -C4 for RS485 communications (Only one option can be ordered) -DI for Digital input switching(Only one option can be ordered)
NOTE: All combinations may not be valid, check spec sheet for valid part numbers.