Xylem PC320 User Manual

Global Water

800-876-1172 • globalw.com

Global Water

Instrumentation, Inc.

151 Graham Road

P.O. Box 9010

College Station, TX 77842-9010

T: 800-876-1172

Int’l: [phone], Fax: [phone]

E-mail : [e-mail]

PC320 Process Controller

02-107
Publication Number 39370712

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Global Water

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Congratulations on your purchase of the Global Water PC320 Process
Controller. This instrument has been quality tested and approved for
providing accurate and reliable measurements. We are confident that you
will find the monitor to be a valuable asset for your application. Should you
require assistance, our technical staff will be happy to help.

Table of Contents

I. PC320 Process Controller Description • • Page 3
II. PC320 Specifications • • • • 5
III. Display Modes • • • • • 6
IV. Switch Settings • • • • • 7
V. Sensor Input • • • • • 8
VI. 4-20mA Output • • • • • 8
VII. Relay Operation • • • • • 8
VIII. Power Saving Mode • • • • • 11
IX. Scientific Notation • • • • • 11
X. Programming Setup Parameters • • • 11
XI. Data Logger Option • • • • • 17
XII. Technical Support • • • • • 17
XIII. Appendix A: Terminal Strip Diagram • • • 19

* Copyright  Global Water Instrumentatio n, Inc. 2012

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Global Water

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I. PC320 Process Controller Description

The PC320 Process Controller is reliab le, accurate and suitable for measuring
any type of 2 and 3 wire sensors with 4-20 mA, 0-1 volt and 0-5 vo lt o ut put s.
The controller comes pre-programmed for use with 12 different common
sensor types and appropriate selectable engineering units. In addition, the
PC320 can be programmed by the user to monitor any type of custom sensor
in any user defi ne d u ni ts. Custom user defined engineering units are also
programmable for all standa rd sensor types. Both 2-poi nt and 3-point
calibration methods are supported and an additional 3
equation can be applied t o the sensor data to correct for non-linearities in
sensor output. The polynomial mode is useful for calculating other
parameters ba se d on a sensor reading such as calculating water flow rate
from water level.

The PC320 controller is enclosed in a NEMA 4 enclos ure and is easily
programmed and calibrated in the field using the water resistant 8 button
keypad and 2-line LCD display, by going through a series of simple menu
options.

The LCD display shows what type of sensor is being monit ored, the data
reading aver aged over a user programmable time period, and the engineering
units selected. The display also shows the current On or Off state for each of
the 4 relays. Two other display modes are available. One shows the
maximum and minimum se nsor readings since last rese t. Another m ode
displays the current sta te of any of the 4 relays in real time, the s ensor
reading tha t caused the last triggerin g event, and the On or Off time
remaining in the control cycle. The LCD display can be backlit for easy
viewing at all times and offers a power saving m ode for limiting curre nt
drain in battery powered applica ti ons.

Four relays are pr ovided for controlling external devices including samplers,
alarms, mixers, pumps, control valves, floodgates and telemetry systems.
Each relay is independe ntly program mable to trig ger on maximum and/or
minimum threshold le ve ls in one of five different control modes.

Relay opera tion is defined by setting upper and low e r sens or thr e sh old levels
and turning relays on when sensor readings exceed a normally defined range.

rd

order polynomial

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Both normally open and normally closed relay contacts are provided. Relay
modes include a One Time tr igger that will engage a relay one time only for
a programmed on time period when a sensor reading falls outside of a
defined normal range. The Steady state mode will turn on a rela y as long as
the sensor readin g is ou t of the normal ran ge. The Cyclic mode will
continually turn a relay on and off for user definable on and off times while
the sensor readin g is outside of normal range. Additionally, High Control
and Low Control Modes are provided. These modes are used for maintaining
a sensor rea ding within a specific range; for example keeping the water level
in a tank between tw o predefined levels. A sixth mode allows a relay to be
deactivated regardles s of sett in g s. There are also programmable Delay
Times and Hysteresis. Setting a Delay Time will delay a relay from turning
on for that amount of tim e when a sensor reading falls outside of normal
range. This is used to limit the effect of rapidly changing sensor reading s
and keeping the relays from reacting q uickly to very small changes near a
threshold setting. The Hysteresis function allows the relay to r emain on until
the sensor readin g fa l ls int o the normal range again, plus a defined hy ste re si s
percentage . This also prevents the relays from overreacting to rapidly
changing events near a threshold level. A test mode is provided for manually
testing rela y operation.

A fully scala ble 4-20mA output i s available for recording sensor data
readings by devices like data loggers, PLC’s, telemetry systems and chart
recorders. There is a factory installed USB data logger option available that
can record these data readings to memory at regular intervals, as well as the
exact times of all changes in relay states and the current sensor reading at t hat
time. Contact a Sales or Technical Support representative for m ore
informatio n. To easily interpret this sensor and relay data, a free sof tw ar e
package is available. A separate manual titled “ FC220-PC320 Data Logger
Option” describes this i n more detail and is available for free download at
globalw.com/support.

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Global Water

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II. PC320 Specifications:

Power Requirements: 12VDC or 18-24VDC Input, +/-10%
Supply Curr ent: 13mA + Sensor Current + B acklight + 4-2 0mA Output
150mA M aximum Total Cur rent
Backlight C urrent: 23mA when on
Internal Fuse: 315mA
Power Adap tor: 18VDC Universal Power Supply, 90-220VAC Input
AC Version only
Sensor Types/Units: Level (Feet, Inches, Meters, Centimeters, C ustom)
Temperature (ºF, ºC, Custom)
pH (ph, Custom)
Conducti vity (uS, mS, C ustom)
Dissolved Oxygen (%, mbar, ppm, mg/L, Custom)
ORP (mV, Custom)
Turbidity (NTU, Custom)
Wind Speed (MPH, KPH, Ft/Sec, M/Sec, Custom)
Wind Direction (º, Cus tom)
Humidity (%, Custom )
Solar Radiation (W/M², Custom)
Pressure ( mbar, hPa, inHg, PSI, Pa, Custom)
Custom (Custom)
Output Relays: 4 Independent S PDT Relays
Contact Rating: 8A @ 250VAC, 5A @ 30VDC Resistive
Level Sensor Input: 2-Wire or 3-wire, 4-20mA, 0-5VDC, 0-1VDC
Output: 4-20mA Scalable
Display/Keypad: 16 Character x 2 Line Backlit LCD, 8-Button Tactile Keypad
Sensor Resolution: 7 Digit Maximum, Auto-Floating point
Accuracy: Sensor Accuracy + 0.1% + 1 Digit
Dimensions: 7.1”W x 5.1”H x 1.4D (180mm x 130mm x 35mm)
Weight: 1 lb

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Global Water

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III. Display Modes

The PC320 has three display mode s, pressing the DISPLAY button on the fron t pane l
cycles through them: Sensor Reading > Max/Min > Relay Status > Sensor Reading ...

Sensor Reading

The top line shows the sensor type. The second line shows the current sensor reading
and units updated once eac h second. The brackets to the right of the sensor read ing
indicate the current on or off status of each of the 4 relays, relay 1 to the left and relay
4 to the right. When the brackets are fil led the relay is on. In the above example, relay
2 is on and the others are off.

Max/Min

This display mode shows t he minimum and maximum re adings since la st reset. To
reset the display, press SAVE for 2 sec onds. Pressing SAVE also turns off all 4 relays.
Once reset, the relays will not trigger again for 15 seconds.

Relay Status

This display mode shows t he current status for each of the relays. Use the UP and
DOWN arrow buttons to scroll through relays 1-4. The top line shows the relay
number, whether it is currently on or off, and how many seconds remain in the on or
off cycle, if applicable . Depending on the relay mode selected, the on and off times
may not apply and would not be displaye d. The bottom line shows if that relay has
been trigge red since last reset. If the relay has been triggered, the sensor reading at the
time of triggering is shown. If the relay has not been triggered, “None” will be
displayed. The relays are turned off and the status reset when the SAVE button is
pressed for 2 seconds. Once reset, the relays will not trigger for 15 seconds. In the
above example, relay 1 is currently off with 125 seconds remaining before it is turned
on again. The relay was last triggered by a sensor reading of 3015.22 uS.

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