Omega Products CDCN-91 User Manual

ELECTRONICS

Dual Channel Conductivity/
Resistivity Controller

CDCN-91 Series

Starts at

$

1075

Features

⻬ 2-Channel Input
⻬ Simultaneous Display
⻬ AC Line-Voltage

or DC Powered

⻬ Display and/or Control: µS, mS, PPM

or PPB (TDS), kΩ, MΩ, % Rejection,
Difference, Ratio, °C or °F

⻬ 3 Fully Scalable

4 to 20 mA Outputs

⻬ Up to 4 Programmable Relays
⻬ Time Delay Relay Function
⻬ Proportional Pulse

Control Capability

⻬ Meets USP Requirements
⻬ Programmable Temperature

Compensation

⻬ Output Simulation for Complete

System Testing

⻬ Simple Push-Button Operation

1

⻬

⁄4 DIN, NEMA 4X (IP65) Enclosure

with Self-Healing Window

Application

⻬ RO/DI System Control
⻬ Demineralizer Regeneration and

Rinse

⻬ Scrubber, Cooling Tower

and Boiler Protection

⻬ Chemical Concentration
⻬ Rinse Tank Water Quality
⻬ Desalinization
⻬ Leak Detection
⻬ Aquatic Animal

Life Support Systems

⻬ Aquaculture
⻬ Environmental Studies

CDCN-91, $1075, shown actual size.

The CDCN-91 Series dual channel
conductivity/resistivity controller is a two­channel input device equipped with three
scalable 4 to 20 mA outputs and four
programmable relays. A selector switch
activates two open collector outputs in
place of two of the relays for extraordinary
output versatility. Dual input and advanced
control capability, including percent
rejection, difference and ratio calculations,
together with the CDCE-91 Series
conductivity sensors listed below, form the
perfect measurement and control system
for water treatment applications and more.
Two versions are available: one accepts
AC line-voltage, the other low voltage DC
for power. The four-button keypad
arrangement with intuitive software design
is user-friendly, and the NEMA 4X (IP65)
integrity of the front panel can be extended
to the entire enclosure by using the
optional rear cover kit.

Specifications

General

Compatible Sensors: CDCE-90 Series

standard conductivity/resistivity sensors

Operating Range:

Conductivity: 0.055 to 400,000 µS/cm
Resistivity: 10 kΩ/cm to 18.26 MΩ/cm

(0.055 to 100 µS/cm)
TDS: 0.001 to 999999 ppm or ppb
(display limit)
Temperature: PT1000: -25 to 120°C
(-13 to 248°F)

Accuracy:

Conductivity/Resistivity:

±2% of reading

Temperature: ±0.5°C

Power Requirements:

100 to 240 Vac:

±10%, 50 to 60 Hz, 20 VA

11 to 24 Vdc: ±10% reg., 0.5A max

Display: Alphanumeric 2 x 16 LCD

Contrast: User selected, 5 levels
Update rate: 1.5 seconds

Current Outputs: (3 each) 4 to 20 mA,

isolated, fully adjustable and reversible
Max Loop Impedance: 150 Ω @ 12V,
450 Ω @ 18V, 750 Ω @ 24V

Update Rate: Approx. 100 mS
Accuracy: ±0.03 mA @ 25°C, 24 Vdc

Open Collector Outputs: (2 each)

Isolated, 50 mA sink or source, 30 Vdc
max pull-up voltage

Operational Settings: Hi, Lo, USP,
Pulse, Off

Hysteresis: User adjustable
Time Delay: 0 to 6400 seconds
Maximum Pulse Rate:

400 pulses/minute

Alarm Contacts: (up to 4 each)
SPDT Relays

Maximum Voltage Ratings:
5A @ 30 Vdc or 5A @ 250 Vac
Operational Settings: Hi, Lo, USP,
Pulse, Off

Hysteresis: User adjustable
Time Delay: 0 to 6400 seconds
Maximum Pulse Rate:

400 pulses/minute

E-29

Our Conductivity Instruments product line continues
to expand, visit omega.com for new details!

For Sales
& Service

U.S.A. and Canada

omega.comomega.com

®

102

(4.0)

56

(2.2)

96 (3.8)

96

(3.8)

Panel Cutout

92 x 92
(+ 0.8, - 0)

3.6 x 3.6
(+0.031, -0)

Optional
Rear Cover
FP90-4X

Panel

gasket

Rear Cover

4-screws

RELAY 1

RELAY 2

RELAY 3

RELAY 4

N/CN/O COM

N/C

N/OCOM N/C

N/O

COM N/CN/O

COM

RELAY 3,4

OPEN 

COLL 3,4

- OPEN COLL 4

+

OPEN COLL 4

-

OPEN COLL 3

+

OPEN COLL 3

-

LOOP 2

+

LOOP 2

-

LOOP 3

+

LOOP 3



-

LOOP 1

+

LOOP 1

SHLD

ISO GND

TEMP 1

SGNL 1

SHLD

ISO GND

TEMP 2

SGNL 2

POWER

OUTPUT OPTION

Æ

L

N

-



+

cable

Liquid Tig ht
Connector
(ordered
separately)

quick-clip

gasket on

front side

of panel

panel

terminals

mounting
bracket

RELAY 1

RELAY 2

RELAY 3

RELAY 4

N/CN/O COM N/C

N/OCOM N/C

N/O

COM N/C N/O

COM

RELAY 3,4

OPEN

COLL 3,4

- OPEN COLL 4

+

OPEN COLL 4

-

OPEN COLL 3

+

OPEN COLL 3

-

LOOP 2

+

LOOP 2

-

LOOP 3

+

LOOP 3

-

LOOP 1

+

LOOP 1

SHLD

ISO GND

TEMP 1

SGNL 1

SHLD

ISO GND

TEMP 2

SGNL 2

POWER

OUTPUT OPTION

Æ

L

N

-

+

RELAY 1

RELAY 2

RELAY 3 RELAY 4

N/C N/O COM N/C N/O COM N/C N/O COM N/C N/O COM

RELAY 3,4

OPEN 

COLL 3,4

- OPEN COLL 4

+ OPEN COLL 4

- OPEN COLL 3

+ OPEN COLL 3

- LOOP 2

+ LOOP 2

- LOOP 3

+ LOOP 3



- LOOP 1

+ LOOP 1

SHLD

ISO GND

TEMP 1

SGNL 1

SHLD

ISO GND

TEMP 2

SGNL 2

POWER

OUTPUT OPTION

Æ

L

N

-

+



11 - 24V

0.5 A

L

N

-

+

3-8860.610A 4/00

100 - 240V
50-60Hz, 20VA

~

Enclosure

Rating: NEMA 4X (IP65) front and

back with optional NEMA 4X (IP65)
rear cover kit

Materials:

Case: PBT
Window: Polyurethane-coated

polycarbonate

Keypad: Sealed 4-key silicone rubber
Weight:

CDCN-91AC: Approx. 581 g (20.5 oz)
CDCN-91: Approx. 544 g (19.2 oz)

INSTALLATION
⻬ Front Panel provides

NEMA 4X (IP65) protection

⻬ Standard
⻬ 102 mm (4") mounting depth
⻬ Optional NEMA 4X (IP65) rear cover

kit with knockout ports
for cable access

⻬ 158 mm (6.3") mounting depth with

optional rear cover installed

1

⁄4 DIN panel cutout

Dimensions: mm (in)

Panel mounting

bracket and panel

gasket are included.

Optional heavy-duty
wall mount bracket
CDCN-91-WMB, $52.

AVAILABLE FOR FAST DELIVERY!

To Order (Specify Model Number)

Model No. Price Description

CDCN-91 $1075 Conductivity/resistivity controller DC power

CDCN-91AC 1085 Conductivity/resistivity controller AC/DC power

Accessories

Model No. Price Description

FP90-4X $48 NEMA 4X (IP65) rear cover kit
FPM-5000-LTCK 43 Liquid-tight kit for rear cover
CDCN-91-WMB 52 Wall mount bracket
FPM-5000-MB 33 Surface mount bracket
FP90RC 18 RC filter kit for relays
CDCE-90-001 320 Conductivity cell constant = 0.01
CDCE-90-01 320 Conductivity cell constant = 0.1
CDCE-90-1 320 Conductivity cell constant = 1.0
CDCE-90-10 550 Conductivity cell constant = 10.0
CDCE-90-20 670 Conductivity cell constant = 20.0

Comes complete with mounting bracket, panel gasket and operator’s manual.
Additional cells available, see pages E-27 and E-28.

Ordering Example: CDCN-91 conductivity/resistivity controller DC power,
with CDCE-90-1 conductivity cell constant, $1075 + 320 = $1395.

Order Online

Over 100,000 Products Available!

Optional surface
mounting bracket
FPM-5000-MB, $33.

Liquid tight
connector kit
3 sets per kit,
FPM-5000-LTCK, $43.
Use with optional
NEMA 4X (IP65)
rear cover kit,
FP90-4X, $48.

Note: This label
appears on the side
of the instrument case

To download information and to order Conductivity
Instrument products online, visit omega.com

E-30

One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | [e-mail]

EPG05

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