Omega PHTX-11 Manual de usuario

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MODEL PHTX-11

pH Two Wire Transmitter

Shop online at

omega.com

User’s Guide

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves

the right to alter specifications without notice.

omega.com [email protected]

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Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)

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4/s

5/6

PART V SERVICE

Block diagram

Table I

Transmitter dimensions input/output connections and

Adjustment pot location

Table II

CALIBRATION

Calibration interval

Equipment required

Calibration procedure

TECHNICAL INFORMATION

Controls

Operation

PART IV

OPERATION INSTRUCTION

INSTALLATION

Unpacking

Mounting

Wiring

PART III

INTRODUCTION

Specification s

General Descriptio n

PART II

TABLE OF CONTENTS

Page No.

PART I

-l-

60 Hz

Manual or auto

95%

600 VDC or peak

-120dB

+60°C

.Ol%/Volt

-10 to

digit

LC D

pHk.01

ht.01

02%/OC

(Display

and current out)

pH*.Ol

iim+DC>O~~~ONAL

0 to 3400 ohms

2onlA

12 to

VDC

1013

ohm

4 to

MODEL PHTX-11 SPECIFICATIONS

Spans:

Input Impedance:

Output Current:

Power Supply:

Load Resistor:

Linearity:

Temperature Coefficient:

Accuracy:

Repeatability:

Output meter:

Supply Voltage Effect:

Operating Temperature:

R.H.:

Isolation:

Common Mode Rej.:

Temperature Compensation:

Any 1 thru 14,

jumper programmable

zero and span adjustable

1 x

-2-

"U"

bolts should bolt to the heavy PVC mounting feet.

"U"

bolts and nuts.

The

attachment to a round pipe requires

#lO

screws and nuts.

2.3 Pipe Mounting

mounting to a flat surface requires the heavy PVC mounting

feet be attached to the box. The surface should be drilled and the

feet mounted with

3/4").

Cut the threaded male portion to allow room for the circuit board.

2.2 Flat Surface

l/2"

the unit can be supported by ridged conduit using

the appropriate size hubs in the ends of the box (ie:

phillips

head screws in the bottom

of the enclosure.

2.1 Conduit Mounting

Mounting

2.0 Before mounting the signal conditioner enclosure, remove the assembled

circuit boards by removing the two

INSTALLATION

Unpacking

After unpacking, remove instrument cover, remove shipping ties or clamp.

Note any special instructions included in the package.

pH.

PART II

unit, for example 6

range or as little as 1

output on command.

The user can change the range of output signal by utilizing jumpers on one of

the circuit boards and adjusting the zero and span pots. The 4 to 20mA output

can be for the full 0 to 14

level is constantly displayed on a 3% digit L.C.D. A push button switch

allows the display to indicate the

D-C.

power supply from 12 to 80 volts may be used.

The input is iso-

lated from the output to prevent accidental damage of sensitive data gathering

equipment at the control location.

The

probe via a BNC co-axial connector.

It transforms the probe signal to a 4 to 20mA D.C. signal that may be transmitted

over 2-wires to a control location. The signal wires also provide power to the

transmitter. The output is monitored by placing a load resistor in the current

loop.

Any

pH/ORP

transmitter featuring input-out-

put isolation, wide power supply range, high input impedance, LCD digital display,

modular construction, programmable span selection, manual/automatic temperature

compensation and a NEMA

housing as a standard enclosure.

The Model PHTX-11 accepts as its input any

OMEGAmModel PHTX-11 is a 2-wire

INTRODUCTION

General

description

The

PART I

-3-

ppm/OC.

ppm/'C

or wire wound

*50

25'C

compensation.

The re-

sistor used should be metal film

8.66K

resistor is normally supplied with

the transmitter,

this value is correct for

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.

sym-

bol.

The probe cable should be shielded and the shield connected to

the ground terminal.

17V.

The maximum supply voltage is 80V.

The

temperature probe

is optional.

If the probe is used, it should be

connected to the terminal strip connection marked with the resistor

250)

c.02

12 +

to 5v.

Minimum supply voltage

250

ohms, vo =

output signal using this as an example: RL

RL).

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

sulting in a

c.02

12 +

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.

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

phillips

head screws supplied.

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.

The

output vires

are isolated from the input and ground, connections

are made to the terminal strip observing polarity to the terminals marked

#lo-24

screws.

Wiring

3. 1

3. 2

3. 3

3. 4

3. 5

3. 6

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

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

2.4 Panel Mounting

-4-

iO.0

buffer solution.

to the user.

or a

adjustment.when

the probe is in a

The choice of a 4.0 or 10.0 is up

4.0

buffer solution

"pH

CAL" with the

for a reading of 7.0 and the "Slope"

probe in a 7.0

value of the buffer solution.

2.2

Probe standardization

is accomplished by adjusting

II-31

of this manual and placing the

sensor in a known buffer solution and turning the power on. The display

should indicate the

units.

Operation

2.1

Initialization

of the transmitter consists of making the connections

described in the wiring (section

is added for a full scale output of 1 to 2

units.

Jumper

is located in the third pair of pads, it may

be added to obtain a full scale output of 2 to 6

units.

Jumper

jumper

is for full scale output currents of 6

to 14

top,

and this

pads

second

from the

is located in the pair of

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.

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

output current level for the desired

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.

"SPAN"

potentiometer is a gain adjustment on the output board.

This

adjustment sets the 20

mA output current level for the desired

readout only.

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

This

adjustment sets the 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

probe on the

input circuit board. This adjustment allows standardization of different

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

"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.

"pH

CAL" potentiometer is an offset adjustment for the

mA.

to 20.0

mA,

normally 4.0

when the switch is in the relaxed position.

When the switch is pressed and held, the display will indicate the output

current to

to 14.00

mA"

on the cover.

The display will

indicate 0.00

1abeled"Press

for

TECHNICAL INFORMATION

Controls

1.1

1.2

1.3

1.4

1.5

1.6

1.7

Display

switch is

OPERATING INSTRUCTIONSPART III

-5-

units.

112

in place.

The output is adjustable

for a span of 2

and

is with jumpers

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

point at the highest

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

point at the lowest

pH,

the "Zero" adjust sets for the 4

units,

for spans of less than 14

in place.

The PHTX-11 is shipped with this

jumper in place.

The output is adjustable for a span of 6 to 14

i/l

is with Jumper

"SloPe" for a reading of 14.00.

until

Output ranging

is accomplished with the jumpers described in Section

1.7, they are used in conjunction with the Span and Zero adjustments.

RANGE

Ad,just

Simulator. Refer to Table I for the millivolt equivalent if a

millivolt source is used.

on the

"14"

Simulator.

Adjust the pot

the display reads 7.00.

"SLOPE"

adjustment is made with the input at

"7"

on the

CAL"

adjustment is made with the input at zero volts from the

millivolt source or a

"pH

2OmA).

Remove the cover from the range switch and turn all switches "Off".

#l>.

Input adjustments should not be made while

the-output is in an-over current condition (ie:

greater than

(25'C

compensation). Refer to Table I for resistance values and

input millivolt values for other temperatures.

Before making any adjustments, the output jumper should be in the full

range position (Range

8.66K

resistor

for manual temperature compensation at the terminals with the resistor

symbol

Simulator or a

2.2 Precision digital

2.3 D.C. power supply

2.4 Load resistor 250

Calibration Procedure

3. 1

3. 2

3. 3

3. 4

3. 5

millivolt source.

multimeter.

24 to 30 volts.

ohm or 500 ohm.

Connect the equipment

as shown in block diagram. Use an

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

2.1

and the decimal point should shift one place to the right.

PART IV

2.3 Test the display

by pressing the display switch.

The display should

indicate

-6-

levels.

at the desired

and the "Span" for 20

PII

simulator

at the input, a resistor at the temperature compensation terminals.

(Refer to Table I for the correct resistor and millivolt values). Adjust

the "Zero" for 4

ZERO adjustments interact and require going back and forth between

them.

Connect a millivolt source,

or preferably a

units.

3.6 SPAN

in place.

The output is adjustable

for a span of 1 or 2

#2,

and

al,

is with jumpersRANGE

---_-_----!-!

-7

‘i_iI__l

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