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: (979) 690-5560, Fax: (979) 690-0440 E-mail : globalw@globalw.
Global Water 800-876-1172 • globalw.com 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 II. PC320 Specifications III. Display Modes IV.
Global Water 800-876-1172 • globalw.com I. PC320 Process Controller Description The PC320 Process Controller is reliable, accurate and suitable for measuring any type of 2 and 3 wire sensors with 4-20 mA, 0-1 volt and 0-5 volt outputs. 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 defined units.
Global Water 800-876-1172 • globalw.com Both normally open and normally closed relay contacts are provided. Relay modes include a One Time trigger 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 relay as long as the sensor reading is out of the normal range.
Global Water 800-876-1172 • globalw.com II.
Global Water 800-876-1172 • globalw.com III. Display Modes The PC320 has three display modes, pressing the DISPLAY button on the front panel 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 each second.
Global Water 800-876-1172 • globalw.com IV. Switch Settings Inside the PC320 is a bank of 8 switches which are used to select the sensor type and power input.
Global Water 800-876-1172 • globalw.com V. Sensor Input The PC320 accepts any analog sensor with a 4-20mA, 0-5VDC or 0-1VDC output. Available power for the sensor depends on the power input to the PC320. When powering the PC320 from 12 volts, the sensor power is also 12 volts. If you are running from a power supply of 18-24 volts, the sensor power can be selected from either a regulated 12 volt supply, or directly from the 18-24 volt input.
Global Water 800-876-1172 • globalw.com Since in normal use the water level will never fall below zero, the Lower Threshold will have no effect and not trigger the relay. Hysteresis is a percentage change of the full span of the sensor required to turn a relay off again once it has been triggered. This is used to keep the relays from turning on and off too often when a sensor reading is very near a threshold level.
Global Water 800-876-1172 • globalw.com Relay Modes: Off: In Off mode, relays will not turn on regardless of settings One Time: In One Time mode, a relay will turn on one time only when a sensor reading is above or below a threshold level. The relay will turn on for the programmed On Time, then turn off regardless of sensor reading. If during the On Time the sensor reading returns to a normal range, the relay will turn off even if the On Time has not elapsed.
Global Water 800-876-1172 • globalw.com VIII. Power Saving Mode A power saving mode is provided that allows the operating current to be reduced in remote monitoring applications. One way this is accomplished is to turn off the LCD display backlight, this saves about 20mA of current. Three modes allow the user to turn the backlight on all the time, off all the time, or turn it on for one minute only.
Global Water 800-876-1172 • globalw.com button to enter any of the setup sub-menus. These sub-menus are Set Sensor Type, Calibrate Sensor, Polynomial Mode, 4-20mA Output Calibration, Decimal Places, Averaging Time, Power Saving, Relay Settings, and Relay Test Mode. Note that while in the setup menus, all normal operations will stop. After one minute of inactivity, the PC320 will automatically return to the main display and operation mode.
Global Water 800-876-1172 • globalw.com First select whether the sensor will be calibrated using a 2 or 3 point method. Generally; sensors are calibrated at 2 points as close to the ends of the sensor’s measurement range as possible. For example: A 15 foot water level sensor would be calibrated using a 2-point method and be set at zero feet and as close to 15 feet as practically possible.
Global Water 800-876-1172 • globalw.com identifiers for the user on the LCD display. Calibrate the sensor normally. You can set the sensor type to Water Flow and the units to CFS (Cubic Feet per Second). A flume or weir equation usually has the form of Q = A * B ^ C; where Q is flow in CFS, A is a multiplier, B is water level in feet and C is an exponent applied to B. However; in many cases a 3rd order polynomial can give a close approximation of flow.
Global Water 800-876-1172 • globalw.com SAVE and MENU. A sensor does not need to be connected during this process. The 20mA Output Cal menu sets the 20mA output in the same way. Use UP and DOWN to adjust the output until the current meter reads exactly 20.000mA. The Calibrate Logger menu is used to recalibrate the PC320 data logger option only and will be discussed in the section titled Data Logger Option and in the Data Logger Option software manual.
Global Water 800-876-1172 • globalw.com SAVE to store the setting. The Sensor Warmup time is how long the sensor will be powered on before a reading is taken, consult the sensor manual. Set this parameter in the same manner as the sample rate. In this example the backlight is in 1 minute mode. The sensor will be turned on for 3 seconds every 60 minutes. The display and 4-20mA output will remain on but will continue to indicate the flow that corresponds to the last sensor measurement.
Global Water 800-876-1172 • globalw.com Relay Test Mode: To manually test relay operation, press the RIGHT arrow. Use UP and DOWN to select the relay number to test. When a relay is selected, press SAVE to toggle the relay between On and Off. Press Display or Back to exit test mode, the relays will turn off upon exit. XI. Data Logger Option A factory option for the PC320 is an internal data logger which records a historical record of water flow, and records the exact time of each relay pulse.
Global Water 800-876-1172 • globalw.com Be prepared to describe the problem you are experiencing including specific details of the application, installation, and any additional pertinent information. b. In the event that the equipment needs to be returned to the factory for any reason, please call to obtain an RMA# (Return Material Authorization). Do not return items without an RMA# displayed on the outside of the package. Clean and decontaminate the PC320 if necessary.
Global Water 800-876-1172 • globalw.com XIII.
