Industrial pH Two Wire 4 to 20 mA Transmitters
PHTX-212/PHTX-014 
UIsolated or Non-Isolated Models Available
U4 to 20 mA Output
UManual or Automatic Temperature Compensation
The model PHTX-014 pH two wire transmitter is designed to provide a standard 4 to 20 mA current output which is proportional to the pH being measured. Its small size and encapsulated construction allow for easy installation and will accommodate any pH electrode with a BNC connector. Temperature compensation is either manual or automatic with use of any 1000Ω Platinum RTD.
The PHTX-212 is the same as the PHTX-014 but with a range of 2 to 12 pH. This is a popular choice for use with recorders
or any application where it is convenient to divide the output into ten divisions.
The PHTX-ORP is for an ORP electrode input with a range of 0 to 2000 mV.
The PHTX-11 features include a NEMA-4X housing, an integral LCD display for continuous pH reading or for
a direct corresponding readout in milliamps, using a convenient push-button switch. The 4 to 20 mA output signal may be scaled in the field to meet specific pH ranges in any 1 to
14 pH unit increment. Temperature compensation is manual using a fixed resistor or automatic using any of OMEGA’s 700 Series thermistors.
Specifications
Range:
PHTX-014: 0 to 14 pH PHTX-212: 2 to 12 pH PHTX-ORP: 0 to 2000 mV
PHTX-11: Any 1 to 14 pH units, user selectable output
Accuracy:
PHTX-014, PHTX-212, PHTX-11: ±0.02 pH PHTX-ORP: ±1.0 mV
Operating Temperature:
PHTX-014, PHTX-212, PHTX-ORP: -25 to 70°C (-13 to 158°F)
PHTX-11: -10 to 60°C (14 to 140°F)
Input Impedance: > 1013 Ω
Temperature Compensation: Manual: fixed resistors;
Automatic: PHTX-014, PHTX-212: 1000 Ω platinum RTD
PHTX-11: OMEGA’s OL-700 series thermistor
Connector: BNC
Power: 12 to 80 Vdc (24 Vdc recommended)
Output:
PHTX-014, PHTX-212, PHTX-ORP: Non-isolated 4 to 20 mA
PHTX-11: Isolated 4 to 20 mA
Input to Output Isolation: PHTX-11: 600 V max
Dimensions:
PHTX-014: 50.8 H x 38.1 W x 24.1 mm D (2 x 1.5 x 0.95") PHTX-212, PHTX-ORP: 57.4 H x 38.1 W x 38.1 mm D (2.25 x 1.5 x 1.5")
PHTX-11: 125 H x 74.2 W x 99.6 mm D (4.92 x 2.92 x 3.92")
Display:
PHTX-11: 31⁄2 digit LCD
Display Resolution: PHTX-11: 0.01 pH
size.
PHTX-11, isolated
4 to 20 mA transmitter,
shown smaller than actual size.
To Order Visit omega.com/phtx014 for Pricing and Details
Model No. Description
PHTX-212 Non-isolated 2 wire pH transmitter, 2 to 12 pH
PHTX-014 Non-Isolated 2-wire pH transmitter, 0 to 14 pH
PHTX-ORP Non-Isolated 2-wire ORP transmitter
PHTX-11 Isolated 4 to 20 mA pH transmitter with integral display, NEMA-4X enclosure
PSS-D12B 12 or 24 Vdc power supply
Comes complete with operator’s manual.
Ordering Examples: PHTX-11, isolated 4 to 20 mA transmitter, PSS-D12B, power supply.
PHTX-014, non-isolated 2-wire pH transmitter, PSS-D12B power supply.
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