Omega Products PHTX-45 User Manual

2-Wire Isolated pH/ORP
Transmitter Systems

PHTX-45

$

1175

Meter and Electrode

⻬ PEEK Sensor Body Construction
⻬ Dual-Glass Style Sensor
⻬ Replaceable Sensor Saltbridge
⻬ Electrode Breakage Diagnostic
⻬ Universal Mounting Configurations
⻬ Microprocessor Based System
⻬ Large Dual Display Format
⻬ Loop Powered, Fully Isolated

Sensor Features

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.

A large volume, dual junction saltbridge is used
to maximize the in-service time of the sensor.
The annular junction provides a large surface
area to minimize the chance of fouling. Large
electrolyte volume and dual reference junction
minimizes contamination of the reference
solution. The replaceable saltbridge allows for
easy sensor regeneration.

The reference element of this sensor
is a second pH electrode immersed in
a reference buffer solution. This glass
reference system allows the sensor
to be used in applications that poison
conventional pH sensors.

An integral preamplifier is encapsulated
in the body of the sensor. This creates a low
impedance signal output which ensures stable
readings in harsh environments, and maximize
the distance between sensor and transmitter.
Sensor diagnostics are used to alarm the user
in the event of electrode breakage, loss
of sensor seal integrity, or integral
temperature sensor failure.

Sensor electrodes can be user-specified
to ensure measurement reliability and
maximum sensor lifetime. The type of glass
used in the pH electrode can be selected for
optimal performance. The metal electrode
used for ORP measurements can be platinum
or gold, depending on chemical makeup
of the process solution.

PHTX-45, transmitter, $625
shown with PHE-45P
electrode, $550, shown
smaller than actual size.

MOST POPULAR MODELS HIGHLIGHTED!

To Order (Specify Model Number)

Model No. Price Description
PHTX-45 $625 pH transmitter
PHE-45P 550 pH electrode
ORTX-45 625 ORP transmitter
ORE-45P 570 ORP sensor, -1000 mV to 2000 mV
U24Y101 169 24 Vdc power supply
PHTX-45-SMH 95 Submersion mounting hardware, 1.8 m (6')
PHTX-45-RK 75 pH/ORP sensor regeneration kit: 1 saltbridge plus

1, 125 mL bottle of reference cell solution, pH 7.00
(for Models PHE-45P and ORTX-45E sensors only)

PHA-4 8 pH 4.01 buffer solution, 475 ml bottle
PHA-7 8 pH 7.01 buffer solution, 475 ml bottle
PHA-10 8 pH 10.01 buffer solution, 475 ml bottle

Comes complete with operator’s manual.
Ordering Example: PHTX-45, pH transmitter, PHE-45P, electrode and PHA-4,
buffer solution, $625 + 550 + 8 = $1183.

Recommended Reference Book: Advanced pH Measurement and Control

FW-332, $89. Visit omega.com/bobi for Additional Books

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& Service

U.S.A. and Canada

Transmitter Features

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®

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.

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 menu
driven 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 two-point and sample
calibration options include auto-buffer
recognition from thirteen built-in buffer
tables. Manual override of the automatic
buffer values allows the user to
customize calibration values. To ensure
high accuracy, all calibration methods
include stability monitors that check
temperature and main parameter
stability before accepting data.

Specifications

PHE-45P and ORE-45P
Sensor Specifications

Sensor Cable: 3 m (10')
Measuring Range:

PHE-45P: 0 to 14.00 pH

ORE-45P: -1000 to 2000 mV
Sensitivity: 0.002 pH, 0.2 mV (ORP)
Stability: 0.02 pH or 2 mV per

24 hours, non-cumulative

Wetted Materials:

PHE-45P: PEEK, ceramic, titanium,

glass, FKM, EDPM (316 stainless

steel with 316SS body option)

ORE-45P: PEEK, ceramic, titanium,

glass, FKM, EDPM, platinum or gold

Temperature Compensation:
Pt1000 Sensor Cable:

6 Conductor plus 2 shields

Temperature Range:

-5 to 95°C (23 to 203°F)

PHTX-45 in Line Application Solution

ORP

ORTX-45, $625, shown
with ORE-45P electrode
reading ORP, $570.

Pressure Range: 0 to 100 psig
Maximum Flow Rate:

3 m (10') per second

Sensor to Transmitter Distance:

914 m (3000')

Mounting Options: 1 NPT convertible
Weight/Shipping Weight:

0.45 kg (1 lb)

PHTX-45 Transmitter
Specifications

Enclosure: NEMA 4X, IP65,

polycarbonate, stainless steel hardware,
weatherproof and corrosion resistant,
112 H x 112 W x 89 mm D
(4.4 x 4.4 x 3.5")
Mounting Options: Wall, panel, pipe,
Din rail, integral-sensor
Conduit Openings: 2-PG9 openings,
1 to 1 NPT center opening, cord grips
and plug included

Weight/Shipping Weight:

0.45 kg (1 lb)
Display: Large, high-contrast,
super-Twist (STN) LCD; 4-digit main
display with 19.1 mm (0.75")
seven-segment character,
12-digit secondary display,

7.6 mm (0.3") 5 x 7 dot matrix character
Keypad: 4-key membrane type with
tactile feedback, polycarbonate with UV
coating, integral EMI/static shield and
conductivity coated window

Ambient Temperature:

Service: -20 to 60°C (-4 to 140°F)
Storage: -30 to 70°C (-22 to 158°F)

Ambient Humidity:

0 to 95%, non-condensing
Location: Designed for hazardous
and non-hazardous areas

pH

PHTX-45, $625
shown with PHE-45P
electrode reading
pH, $550.

CDTX-45, $650,

shown with CDE-45P

electrode reading

conductivity, $450. Visit

omega.com/cdtx45

EMI/RFI Influence:

Designed to EN61326-1

Voltage Range:

16 to 35 Vdc (two-wire device)

Output Isolation:

600 V galvanic isolation

Transmitter Cable Type:

Belden twisted-pair, shielded
Filter: Adjustable 1 to 99 seconds
additional damping to 90% step input
Temperature Input: Selectable Pt1000
or Pt100, automatic compensation

µS

PHE-45P Performance
Specifications

Displayed Parameters:
Main Input: 0 to 14.00 pH;
Sensor Voltage: ±500 mV;
Loop Current: 4 to 20 mA;
Sensor Temperature:

-10 to 110°C (14 to 230° F)

Main Parameter Range: 0 to 14.00 pH
Input Impedance: Greater than 1013 Ω
Repeatability: 0.1% of or better
Sensitivity: 0.05% of span
Non-Linearity: 0.1% of span
Stability: 0.1% of span

per 24 hours, non-cumulative
Warm-Up Time: 4 seconds to
rated performance

Supply Voltage Effects: ±0.05% span
Transmitter Response Time:

4 seconds to 90% of step input at
lowest setting

Temperature Drift:

Span or zero, 0.02% of span/°C

Sensor to Transmitter Distance:

914 m (3000') w/preamp,

9.1 m (30') w/o preamp

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