Omega Products CN8502 User Manual

1

⁄16 DIN Temperature/Process

Controllers

CN8500 Series

Starts at

$

264

⻬ NEMA 4X (IP65)

Front Panel

⻬ User Selectable

Ramp to Setpoint

⻬ Bumpless Auto/

Manual Operation

⻬ Optional RS232 or

RS485 Communications

⻬ Autotuning Heat or Cool
⻬ Thermocouple, RTD,

Voltage, or Current Input

⻬ Dual Output and Dual

Alarm Capability

⻬ Optional Remote Setpoint,

Transducer Power Supply
and Recorder Output

Optional Power, 24 Vdc/Vac

⻬

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Transition junction
probes sold separately.
See page A-78.

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CN8501, $264.

The CN8500 temperature controller
is extremely versatile and user-friendly.
The operator needs to review only
those parameters relevant to the
particular application during setup.
A dual digital display offers optimum
process information at a glance.
The dedicated upper display shows
the process temperature, while the
lower display displays setpoint and
setup parameters. Individual LED’s
identify the status of outputs, alarms,
digital communications and special
options. The CN8500 features a
NEMA 4X (IP65) 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, or 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.

Specifications

Performance

Accuracy: ±0.2% of full scale, ± digit
Setpoint Resolution: 1 count/0.1 count
Repeatability: ±1.0 count
Temperature Stability: 5 µV/°C max;

3 µV/°C typical

Thermocouple Cold Junction
Tracking: 0.05°C/°C ambient

Common Mode Rejection: >100 dB
Series Mode Rejection: >70 dB
Process Sampling: 10 Hz (100 ms)

Inputs

Thermocouple Lead Resistance:

100Ω max for rated accuracy

Response Time: 0.1, 1.0, or 10 s
Decimal Position: Selectable

Outputs

Output #1: Reverse acting (heating)
Output #2: Direct acting (cooling)

Mechanical Relay: Rated 5A @ 120 Vac,

3A @ 240 Vac

Current: 4-20 mA, 500 Ω max
Voltage: 20 Vdc pulse, 1 kΩ minimum load
Triac: SSR, 120/240 Vac, zero voltage

switched rated 1A continuous, 10 A
surge @ 25°C

Alarms: Optically isolated triac rated
1A, 120/240 Vac @ 25°C

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 seconds
Reset: 0 to 3600 seconds
Cycle Time: 0.2 to 120 seconds
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

P-43

General

Power: 115 to 230 Vac ±10%,

50/60 Hz; 115 to 300 Vdc ±10%
(auto-polarity), optional 24 Vdc/Vac

Display: Dual LED, 4-digit, orange
process display, green menu/ parameter
display; 9.2 mm (0.37")

Power Consumption: Less than 6 VA
(instrument) @ 120 Vac

Weight: 0.25 kg (8 oz)
Panel Cutout: 45 mm (1.772") square
Dimensions: 53 H x 53 W x 18.3 mm

bezel (2.1 x 2.1 x 0.72")

Depth Behind Panel: 100 mm (3.937")
Front Panel Rating: NEMA 4X (IP65)
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

Bezel Dimensions

53

(2.1)

53

(2.1)

Dimensions: mm (in)

A

lso Available

1

in

⁄

8

D

IN

Sizes! See Page

and

1

⁄4

DIN

P-57

Input Types and Ranges

Input
Code Type Range Resolution

Iron-Constantan -18 to 760°C (0 to 1400°F) 1°C (1°F)

CHROMEGA

-ALOMEGA

C Copper-Constantan -129 to 316°C (-200 to 600°F) 1°C (1°F)

T

OMEGALLOY

Pt/13%Rh-Pt -18 to 1760°C (0 to 3200°F) 1°C (1°F)
Pt/10%Rh-Pt -18 to 1760°C (0 to 3200°F) 1°C (1°F)

3-wire, 100Ω Pt -200 to 850°C (-328 to 1562°F) 1°C (1°F)

RTD

V5 0 to 5V, 1 to 5V Scalable (-1999 to 9999) Selectable
V10 0 to 10V, 2 to 10V Scalable (-1999 to 9999) Selectable
MV 0 to 50 mV, 10 to 50 mV Scalable (-1999 to 9999) Selectable
MA 0 to 20 mA, 4 to 20 mA Scalable (-1999 to 9999) Selectable

3-wire, 100Ω Pt

®

®

®

-18 to 1349°C (0 to 2460°F) 1°C (1°F)

-18 to 1299°C (0 to 2370°F) 1°C (1°F)

-128.8 to 232.2°C 0.1°C

(-199.0 to 450.0°F) (0.1°F)

AVAILABLE FOR FAST DELIVERY!

To Order

Model Number Price Description
CN8501(*)-(**) $264 Single output
CN8502(*)-(**)-(***) 289 Dual output

Comes complete with operator’s manual.

** Specify input code: “TC” (thermocouple), “RTD”, “MV” (voltage to 50 mV),
“V5” (voltage to 5V), “V10” (voltage to 10V) or “MA” (current to 20 mA). See input type table

above for details.
*** Specify output code(s) from output options table below. Single output units can be ordered
for either heat (reverse) or cool (direct) action.

For power option add suffix “-24” to model number for 24 Vdc/Vac power, and $25 to price.

Output Options (No Additional Cost)

Output Type (Reverse) Order Suffix (Direct)†Order Suffix
5 A Relay -R1 -R2

1 A SSR -T1 -T2
4 to 20 mA -F1 -F2
20 Vdc Pulse -DC1 -DC2

† Single output controllers can be ordered for either heat (reverse) or cool (direct) acting.
Ordering Example: CN8501TC-R2,

configured for cooling operation, $264.

Options (1⁄16 DIN—Only 1 Option Available Per Unit)

Order Suffix Add’l Price Description

-A $40 Dual alarms

-C2 95 RS232 communications

-C4 95 RS485 communications

-PV1

-PV2

-RSP1

-RSP2

-RSP3

-XP1 75 Transducer power supply, 15 Vdc

† Not available for voltage or current input models with input codes “MV”, “V5”, “V10” or “MA”.
Ordering Example: CN8502V5-F1-F2-C2, 0 to 5 Vdc input, dual 4 to 20 mA outputs, RS232

communications, $289 + 95 = $384.

Accessories

Model No. Price Description

CNQUENCHARC $8 Noise suppression RC snubber (2 leads),

CN8-SW

†† Free CN8-SW software download available at

(Specify Model Number)

First Output Heat Only Second Output Cool Only

1

†

†

†

†

†

††

P-44

75 4 to 20 mA recorder output
75 0 to 5 Vdc recorder output
75 Remote switch closed with 1 alarm
75 Remote switch open with 1 alarm
75 0 or 5 Vdc remote setpoint with 1 alarm

110 to 230 Vac

N/C Remote monitoring and control software

DIN controller, thermocouple input, 5 A relay output

⁄

16

omega.com/cn8501

P

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