Omega Products CDE-45P User Manual

2-Wire Isolated Conductivity Transmitter System

CDTX-45 and

CDE-45P System

U PEEKTM Sensor Body Construction
U 4-Electrode Sensor Type
U Electrode Coating Rejection Diagnostic
U Universal Mounting Configurations
U Microprocessor-Based System
U Large Dual Display Format
U Loop Powered, Fully Isolated

Sensor Features

The sensor housings are constructed of
PEEK, a high performance thermoplastic
that provides outstanding mechanical
strength and chemical resistance. Multiple
sealing materials are used to preserve
sensor integrity over a wide range of
applications.

The four electrodes used in the cell are
made of titanium for greater chemical
resistance. Two of these electrodes
are used to establish the sensor drive
potential. The other two electrodes sense
the flow of current between the drive
electrodes and maintain the proper drive
potential. The current that flows between
the two drive electrodes is directly
proportional to solution conductivity.

With conventional two-electrode sensors,
as the process solution begins to coat
the electrode surfaces, the sensor
output signal begins to decrease. This
produces an artificially low conductivity
measurement.

The CDTX-45 four-electrode system uses
electrode diagnostics to compensate
for the effects of fouling. As the two
drive electrodes become coated by the
process solution, a feedback mechanism
involving the two sensing electrodes
detects the decrease in drive potential
and automatically re-establishes
the proper drive potential. When the
degree of coating reaches a limit where
compensation is no longer possible, the
diagnostic actuates an alarm to signal that
the sensor requires cleaning.

The unique drive/control scheme of
this system allows a single sensor
configuration to be used reliably over
a wide conductivity range. This system
eliminates the requirement for multiple
sensors with varying cell constants that
are restricted to narrow operating ranges.

Transmitter Features

The microprocessor-based transmitter
is loop-powered and fully isolated for high
service reliability. The transmitter includes
devices to protect the system from power
surge and brownout events.

CDE-45P, electrode,
shown smaller
than actual size.

To Order

Model No. Description
CDTX-45 Conductivity meter/transmitter, electrode sold separately
CDE-45P Conductivity electrode
CDTX-45-115VAC-R2 Conductivity meter/transmitter, 115/230 Vac power, 2-relay

PSU-93 Unregulated power supply, 16 to 23 Vdc
PHTX-45-SMH Submersion mounting hardware, 1.8 m (6')

Comes complete with operator’s manual.

Ordering Examples: CDTX-45, conductivity transmitter, and CDE-45P electrode.
CDTX-45, conductivity transmitter, and CDE-45P, electrode, PHTX-45-SMH, submersion mounting

hardware.

Visit omega.com/cdtx45 for Pricing and Details

CDTX-45, meter/
transmitter,
shown smaller
than actual size.

Meter and electrode

sold separately.

outputs, electrode sold separately

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For Sales
& Service

U.S.A. and Canada

omega.com

CDTX-45 An In-Line Application Solution

ORP

ORTX-45 shown with
ORE-45P electrode
reading ORP. For
more information
visit omega.com/phtx45

The large, high contrast, super-twist
display provides excellent readability
over a wide operating temperature range,
even in low light conditions. The main
display line consists of large, segmented
characters with measurement units. The
secondary display line utilizes easily
readable dot matrix characters for clear
display of calibration and diagnostic
messages. Two of four measured
parameters may be
displayed simultaneously.

Four-button programming provides
intuitive navigation through the menu­driven user interface. The 4 to 20 mA
transmitter output can be configured to
represent any portion of the measurement
range. Output HOLD, ALARM and
SIMULATION features provide the user
with complete control of the system output
under any condition.

Diagnostic messages provide a clear
description of system condition, which
eliminates confusing error codes that must
be looked up in the operator’s manual.

The flexible calibration method includes
stability monitors that check temperature
and main parameter stability before
accepting data.

pH

PHTX-45 shown with
PHE-45P electrode
reading pH.
For more information
visit omega.com/phtx45

CDTX-45 shown with

CDE-45P electrode

reading conductivity.

Specifications

CDE-45P Sensor

Accuracy: 0.3% of span (± 0.1 µS)
Repeatability: 0.3% of span (± 0.1 µS)
Sensitivity: 0.05% of span (± 0.1 µS)
Stability: 0.1% of span per 24 hours,

non-cumulative

Warm-up Time: 7 sec
Supply Voltage Effects: ± 0.05% span
Instrument Response Time: 12 sec
Temperature Drift: Span or zero, 0.03%

of span/°C

Max Cable Length: 18.3 m (60')

CDTX-45 Transmitter

Analog Outputs:

CDTX-45: Loop powered 4 to 20 mA

output for conductivity
CDTX-45-115VAC-R2: Dual 4 to 20 mA
outputs, second output programmable
for temperature or conductivity
outputs isolated

Relay Outputs:

Two SPDT, 6 Amp@250 Vac, 5 Amp
@24 Vdc (CDTX-45-115VAC-R2 only)
Displayed Parameters: Main input,

0.0 µS to 2000 mS, % Concentration,
sensor temperature [-10.0 to 110.0°C
(14 to 230°F)], loop current
(4.00 to 20.00 mA)
Main Parameter Ranges: Automatic or
manual; 0.0 to 2.0 µS, 0.0 to 20.0 µS,
0 to 200 µS, 0 to 2000.00 µS, 0.00 to

2.00 µS

µS

Display: Large, high-contrast, Super-Twist
(STN) LCD; 4-digit main display with sign,

19.1 mm (0.75") 7-segment characters;
12-digit secondary display, 7.6 mm (0.3")
5 x 7 dot matrix characters
Keypad: 4-key membrane type with tactile
feedback, polycarbonate with UV coating,
integral EMI/static shield and conductively
coated window
Operating Ambient: -20 to 60°C
(-4 to 140°F), 0 to 95% RH,
non-condensing
EMI/RFI Influence: Designed to
EN 61326-1

Output Isolation: 600V galvanic isolation
Filter: Adjustable 0 to 9.9 minutes

additional damping to 90% step input
Temperature Input: Selectable Pt1000 or
Pt100 RTD

Power: 16 to 35 Vdc (2-wire device)
Enclosure: NEMA 4X, polycarbonate,

stainless steel hardware, weatherproof
and corrosion resistant
Conduit Openings: Three PG-9 openings
with gland seals
Dimensions: 112 H x 112 W x 89 mm D
(4.4 x 4.4 x 3.5")

Mounting Options: Wall, panel, pipe/header
Weight: 0.45 kg (1 lb)

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