PART III - OPERATING INSTRUCTIONS & TECHNICAL INFORMATION

1.Controls

1.1 Display switch is 1abeled"Press for mA" on the cover. The display will indicate 0.00 pH to 14.00 pH when the switch is in the relaxed position.

When the switch is pressed and held, the display will indicate the output current to mA, normally 4.0 mA to 20.0 mA.

1.2 "pH CAL" potentiometer is an offset adjustment for the

pH probe on the

input circuit board.

This adjustment allows standardization of different

probes, it affects the displayed readout and the output current.

 

1.3"Slope" potentiometer is a gain adjustment on the input circuit board. This adjustment is used to standardize the readings for probes with less

than 100% efficiency, it affects the displayed readout and the output current.

1.4"R19" potentiometer is a gain adjustment on the output circuit board. This adjustment is factory set and should not need adjustment in the

field, it affects the displayed pH readout only.

1.5

"ZERO" potentiometer is an offset adjustment on the output board.

 

 

This

 

adjustment sets the 4

mA output current level for the desired

pH

level,

 

it is used in conjunction with the range switch.

The “Zero" pot affects

 

the output current only.

There is interaction between the "Zero" and

 

 

 

"Span" pots.

 

 

 

 

 

 

 

1.6

"SPAN" potentiometer is a gain adjustment on the output board.

 

This

 

adjustment sets the 20

mA output current level for the desired

pH

level,

 

it is used in conjunction with the range switch.

The "Span" pot affects

 

the output current level only.

There is interaction between the "Zero"

 

 

and "Span" pots.

 

 

 

 

 

 

 

1.7 Range jumpers are located on the output board.

These jumpers allow the

 

user to increase the sensitivity of the output.

There are 4 jumper pairs

 

of pads, the uppermost position is not used; there are no traces connected

 

 

to this pair of pads.

Jumper

#l is located in the pair of

pads

second

 

from the

top,

and this jumper is for full scale output currents of 6

 

 

 

to 14 pH units.

Jumper #2 is located in the third pair of pads, it may

 

be added

to obtain a full scale output of 2 to 6

pH units.

Jumper

#3

 

is added

for a full scale output of 1 to 2

pH units.

 

 

 

2.Operation

2.1Initialization of the transmitter consists of making the connections

described in the wiring (section II-31 of this manual and placing the

sensor

in a known buffer solution and turning the power on.

The display

should

indicate the

pH value of the buffer solution.

 

2.2Probe standardization is accomplished by adjusting "pH CAL" with the probe in a 7.0 pH buffer solution for a reading of 7.0 and the "Slope" adjustment.when the probe is in a 4.0 pH or a iO.0 buffer solution.

The choice of a 4.0 or 10.0 is up

to the user.

-4-

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Omega Engineering PHTX-11 manual Part III Operating Instructions & Technical Information
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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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