2.4 Panel Mounting

- refer to Table II for hole sizes and locations.

This

mounting requires the PVC mounting feet and four PVC mounting blocks.

 

The blocks are drilled and tapped for

#lo-24 screws.

 

3 . Wiring

3.1 After the enclosure is properly mounted the wires for input, output, ground and remote temperature sensing should be routed through the en-

closure hubs.

These connections should be trimmed to the proper length

and connected

to the circuit board assembly.

The circuit board assembly

should then be placed in the enclosure and fastened to the bottom of

the enclosure with the two

phillips head screws supplied.

3.2 The input probe connector is a BNC jack mounted on the input circuit

board. Use only a coaxial cable that has isolation around the shield. The shield is isolated from ground and this isolation should be maintained

for proper operation. For best results,

the probe cable should not be

longer than 10 feet.

Long cables result in slow response because the

probe must charge the cable capacitance through the high probe source resistance.

3.3 The output vires are isolated from the input and ground, connections are made to the terminal strip observing polarity to the terminals marked +, - out. These wires are to be connected to a D.C. power supply through

a load resistor. The wires can be as long as necessary.

3.4 The Loop resistor can be either in the positive or negative power supply lead. The value of the loop resistor depends on the voltage required

at the monitoring location.

Calculate the required power supply voltage

from the following equation:

Minimum power supply voltage

= 12 +

c.02

x RL).

A convenient value for the loop resistor might be 250 ohms, re-

 

sulting in a

1V to 5V

output signal using this as an example: RL

 

= 250

ohms, vo =

1v to 5v.

Minimum supply voltage

= 12 + c.02 x

250) =

17V.

The maximum supply voltage is 80V.

 

 

 

 

3. 5 The temperature probe

is optional.

If the probe is used, it should be

 

connected to the terminal strip connection marked with the resistor

sym-

bol.

The probe cable should be shielded and the shield connected to

 

 

the ground terminal.

 

 

 

 

 

 

3.6 Manual temperature compensation requires only a resistor at the terminal

strip connection

marked with a resistor symbol.

Refer to Table I for

the value vs. temperature.

An

8.66K

resistor is normally supplied with

the transmitter,

this value is correct for

25'C compensation.

The re-

sistor used should be metal film

*50

ppm/'C

or wire wound

f

ppm/OC.

-3-

Page 6
Image 6
Omega Engineering PHTX-11 manual Blocks are drilled and tapped for #lo-24 screws, To the circuit board assembly, 1V to, Bol

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.

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