Presto-Tek pH Transmitters
INDUSTRIAL pH 2-WIRE
4-20 mA TRANSMITTERS
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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.
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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
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
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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 NEWPORT’s 700 Series
thermistors. pH Electrodes purchased separately. |
To Order (Specify Model No.) Prices shown in U.S. Dollars
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Model No.
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Description
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Price
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PHTM-014
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Non-isolated 4 to 20 mA pH transmitter, 0 to 14 pH |
$189
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PHTM-212
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Non-isolated 4 to 20 mA pH transmitter, 2 to 12 pH |
$189
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PHT422I
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Isolated 4 to 20 mA pH transmitter with integral display NEMA 4X enclosure |
$430
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| 24 Vdc power supply |
$115
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