Industrial pH Two-Wire 4-20 mA Transmitters

INDUSTRIAL pH 2-WIRE 4-20 mA TRANSMITTERS

PHTM-014
Non-isolated 2-wire Transmitter
PHTM-014 Non-isolated 2-wire Transmitter

Isolated or Non-Isolated Models Available
4 to 20 mA Output

The PHTM Series 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 1000 ohm Platinum RTD.

The PHTM-014 covers the full 0 to 14 pH range. The PHTM-212 with a 2 to 12 pH input is the popular choice for use with recorders or any application where it is convenient to divide the 4 to 20 mA output into ten divisions.

SPECIFICATIONS
Range: 0 to 14 pH or 2 to 12 pH

Span
PHTM-014: 0 to 14 pH
PHTM-212: 2 to 12 pH
Any 1 to 14 pH unit, selectable with internal jumper pads

Accuracy: ▒0.02 pH

Operating Temperature
PHTM-014, PHTM-212: -25 to 70ºC
PHT422I: -10 to 60ºC

Temperature Compensation
Manual: fixed resistors
Automatic

PHTM-014, PHTM-212 1000 ohm RTD
PHT422I NEWPORT 700 Series thermistor

Connector: BNC
Input Impedance: 10¹³ Ohms

Output
PHTM-014: Non-isolated 4 to 20 mA
PHTM-212: Non-isolated 2 to 12
PHT422I: Isolated 4 to 20 mA

Input to Output Isolation: PHT422I, 600 V maximum

Dimensions
PHTM-014, PHTM-212: 50.8 H x 38.1 W x 24.1 mm D (2" x 1.5" x 0.95")
PHT422I: 125 H x 74.2 W x 99.6 mm D (4.92" x 2.92" x 3.92")

Display
PHT422I: 3 1/2 digit LCD

Display Resolution
PHT422I: 0.01 pH

Power: 12 to 80 Vdc

The PHT422I 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 4-20 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 NEWPORTÆs 700 Series thermistors.

PHT422I Isolated 4-20 mA Transmitter.
pH Electrodes purchased separately.

To Order (Specify Model No.) Prices shown in U.S. Dollars

Model No.	Description	Price
PHTM-014	Non-isolated 4 to 20 mA pH transmitter, 0 to 14 pH	$189
PHTM-212	Non-isolated 4 to 20 mA pH transmitter, 2 to 12 pH	$189
PHT422I	Isolated 4 to 20 mA pH transmitter with integral display NEMA 4X enclosure	$430
U24Y101	24 Vdc power supply	$115

Ordering Example: PHT422I, isolated 4-20 mA transmitter, U24Y101 power supply, $430 + 115 = $545.