2.3 Test the display by pressing the display switch. The display should indicate mA and the decimal point should shift one place to the right.

PART IV - CALIBRATION

The recommended calibration interval for the transmitter is six months under

normal operating conditions, and assuming the sensor is in good condition. This system may need adjustment to compensate for reduced efficiency of the sensor before the calibration interval.

Equipment Required

2.1pH Simulator or a millivolt source.

2.2Precision digital multimeter.

2.3D.C. power supply 24 to 30 volts.

2.4Load resistor 250 ohm or 500 ohm.

Calibration Procedure

 

 

3. 1 Connect the equipment as shown in block diagram.

Use an 8.66K resistor

for manual temperature compensation at the terminals with the resistor

symbol (25'C compensation).

Refer to Table I for resistance values and

input millivolt values for other temperatures.

 

3.2 Before making any adjustments, the output jumper should be in the full range position (Range #l>. Input adjustments should not be made while

the-output is in an-over current condition (ie: greater than 2OmA). Remove the cover from the range switch and turn all switches "Off".

3.3 "pH CAL" adjustment is made with the input at zero volts from the

millivolt source or a pH of "7" on the pH Simulator. Adjust the pot until the display reads 7.00.

3. 4 "SLOPE" adjustment is made with the input at

"14" pH on the

pH Simulator.

Refer to Table I for

the millivolt equivalent if a

millivolt source is used.

Ad,just

"SloPe"

for a reading of 14.00.

3.5 Output ranging is accomplished with the jumpers described in Section 1.7, they are used in conjunction with the Span and Zero adjustments.

RANGE

i/l is with Jumper

#l in place.

The PHTX-11 is shipped with this

jumper in place.

The output is adjustable for a span of 6 to 14

pH

units,

for spans of less than 14

pH, the "Zero" adjust sets for the 4

 

mA point at the lowest

pH point of the range, and the "Span" sets the

 

20 mA point at the highest

pH point of the range.

The adjustments are

sensitive and interactive,

do not attempt large changes, work both ad-

 

justments in turn with small changes.

 

 

 

 

 

RANGE

#2 is with jumpers

fl and

112

in place.

The output is adjustable

for a span of 2

to 6

pH

units.

 

 

 

 

 

-5-

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Omega Engineering PHTX-11 manual Range
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PHTX-11 specifications

Omega Engineering PHTX-11 is an advanced temperature and pressure transmitter known for its robust design and high performance in various industries. The PHTX-11 is specifically designed to measure temperature and pressure accurately, making it an ideal choice for applications in process control, HVAC systems, and various manufacturing processes.

One of the main features of the PHTX-11 is its wide measurement range, capable of handling extreme temperatures and pressures. This versatility allows it to be used in a broad spectrum of applications, from food processing to chemical production. The device can function effectively in harsh environments, ensuring reliability and precision even under challenging conditions.

The PHTX-11 utilizes state-of-the-art sensing technologies to deliver high accuracy and fast response times. The temperature measurement is based on either thermocouple or RTD sensors, depending on the specific needs of the application. This flexibility allows users to choose the most suitable sensor for their requirements, enhancing the overall efficiency of the system.

Moreover, the pressure measurement in the PHTX-11 is achieved through high-quality piezo-resistive sensors, which provide superior performance and durability. These sensors are resistant to changes in temperature and can withstand overpressure conditions, ensuring long-term reliable service.

The PHTX-11 also features a user-friendly interface, making it easy to configure and calibrate. The digital display allows for real-time monitoring and provides valuable insights into system performance. Additionally, the transmitter supports various communication protocols, including analog outputs, which facilitate integration into existing control systems.

Another significant characteristic of the PHTX-11 is its compact and robust design. It is built in a rugged housing that meets high protection standards, such as NEMA and IP ratings, ensuring it can endure demanding industrial environments. This durability reduces downtime and maintenance costs, contributing to a more efficient operation.

In summary, Omega Engineering's PHTX-11 is a highly effective and versatile temperature and pressure transmitter. With its advanced sensing technologies, wide measurement range, user-friendly features, and rugged construction, it stands out as a top choice for industries that require dependable measurement solutions. Its capability to integrate seamlessly with various systems further enhances its appeal to engineers seeking reliable instrumentation in their processes.
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