Page 1
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
Page 2
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
Page 3
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