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1/8 and 1/4 DIN Autotune Universal Input Controllers

Universal Temperature/Process Controllers


Item# CN8551RTD-R1

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 C$860.87
10-24 C$817.83
25-49 C$774.78
50-99 C$731.74
100-499 C$688.70
500+ C$645.65

In stock

Lead Time (If not in stock): 5 weeks
Universal Temperature/Process Controllers CN8551RTD-R1 CN8551RTD-R1
  • NEMA 4X (IP66) Front Panel Standard
  • Universal Power Supply
  • User-Selectable Ramp to Setpoint
  • Smooth Auto/Manual Operation

The CN8500 Series temperature controller is versatile and user-friendly. The operator needs to review only those parameters relevant to the particular application. A dual digital display offers optimal process information at a glance. The dedicated upper display shows the process temperature, while the lower display displays setpoint and setup parameters. Individual LEDs identify the status outputs, alarms, digital communications, and special options. The CN8500 Series features a NEMA 4X front panel and a universal power supply that accepts 103 to 253 Vac and 103 to 330 Vdc. Control algorithms available are P, PI, PD, PID, and on/off. The autotune feature automatically sets proportional band, rate, and reset before the process reaches setpoint. These parameters provide quick stabilization of both the heating and cooling process without overshoot, hunting, or cycling. The standard dual control outputs can be configured in a variety of control and alarm applications such as heat, heat/cool, heat/alarm, cool, or cool/alarm. The ramp-to-setpoint feature allows the user to define the rate of rise to reach the setpoint, thus minimizing thermal shock to the load during start-up.

Input CodeTypeRangeResolution
-18 to 760°C1°C
0 to 1400°F1°F
-18 to 1349°C1°C
0 to 2460°F1°F
-129 to 316°C1°C
-200 to 600°F1°F
-18 to 1299°C1°C
0 to 2370°F1°F
Pt/13% Rh-Pt
-18 to 1299°C1°C
0 to 3200°F1°F
Pt/10% Rh-Pt
-18 to 1299°C1°C
0 to 3200°F1°F
3-wire, 100 Ω Pt
-200 to 850°C1°C
-328 to 1562°F1°F
3-wire, 100 Ω Pt
-128.8 to 232.2°C0.1°C
-199.0 to 450.0°F0.1°F
V51 to 5 VScalable (-1999 to 9999)Selectable
0 to 5 V
V102 to 10 VScalable (-1999 to 9999)Selectable
0 to 10 V
MV10 to 50 mVScalable (-1999 to 9999)Selectable
0 to 50 mV
MA4 to 29 mAScalable (-1999 to 9999)Selectable
0 to 20 mA

Accuracy: ±0.2% FS, ±1 digit
Setpoint Resolution: 1 count/0.1 count
Repeatability: ±1.0 count
Temperature Stability: 5 µV/°C max; 3 ìV/°C typical
Thermocouple Cold-Junction Tracking: 0.05°C/°C ambient
Common Mode Rejection: >100 dBA
Series Mode Rejection: >70 dBA
Process Sampling: 10 Hz (100 ms)

Thermocouple Lead Resistance: 100 Ω max for rated accuracy
Response Time: 0.1, 1.0 or 10 s
Decimal Position: Selectable

Output #1: Reverse acting (heating)
Output #2: Direct acting (cooling)
Mechanical Relay: Rated 5 A @ 120 Vac, 3 A @ 240 Vac
Current: 4 to 20 mA, 500 Ω max
Voltage: 20 Vdc pulse, 1 kΩ min load
Triac: Solid state relay, 120/240 Vac, zero voltage switched rated 1 A continuous, 10 A surge @ 25°C (77°F)
Alarms: Optically isolated triac rated 1 A, 120/240 Vac @ 25°C (77°F)

Control Characteristics
Setpoint Limits: Limited to configured range for thermocouple and RTD; limited to scaled range
Alarms: Adjustable for high/low, process or deviation
Rate: 0 to 900 s
Reset: 0 to 3600 s
Cycle Time: 0.2 to 120 s
Gain: 0 to 400
Gain Ratio: 0 to 2.0 (in 0.1 increments)
On/Off Deadband: 1 to 100 counts
Spread (Output 2): 0 to 100 counts (above setpoint)
Damping: Adjustable (low, normal or high)
Ramp to Setpoint: 1 to 100 minutes
Autotune: Operator-initiated from front panel
Manual Control: Operator-initiated from front panel

Power: 115 to 230 Vac ±10%, 50/60 Hz; 115 to 300 Vdc ±10% (auto-polarity)
Display: Dual LED, 4-digit process display, green menu/parameter display; 9.2 mm (0.37") high for 1/8 DIN models; 14 mm (0.55") process display for 1/4 DIN units
Power Consumption: Less than 6 VA (instrument) @ 120 Vac
Weight (1/8 DIN): 0.34 kg (12 oz)
Weight (1/4 DIN): 0.425 kg (15 oz)
Panel Cutout (1/8 DIN): 45 x 92 mm (1.772 x 3.622")
Panel Cutout (1/4 DIN): 92 mm (3.622") square
Dimensions (1/8 DIN Horizontal): 53 x 100 mm (2.1 x 3.95"); 18.3 mm (0.72") depth
Dimensions (1/4 DIN): 100 W x 100 H x 18.3 min bezel (3.95 x 3.95 x 0.72")
Panel Depth: 100 mm (3.937")
Front-Panel Rating: NEMA 4X (IP66)
Operating Ambient Range: 0 to 55°C (32 to 131°F) @ 90% RH max, non-condensing
Memory Protection: Solid state non-volatile memory
Connections: Rear barrier strip with locking terminals
Contacts: Twin bifurcated
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