Walchem WebMaster Manuel d'instructions télécharger pdf (Page 55)

Units of Measure

Click on the radio button corresponding to your preferred unit of measure.

Volume Units. If you select “Gallons”, then every volume-related menu (such as drum levels) will

be in US Gallons. Otherwise, they will all be in Liters or in Cubic Meters.

Flow Units. Select the units of measure desired for all flow measurements (flow rate if using a 4-

20 mA type water meter or water meter totals).

Temperature Units. Select between Fahrenheit and Celsius.

Conductivity Units. If you select “ppm” then all conductivity set points will be in parts per

million. You will be asked to supply the conversion factor to use to convert from µS/cm to ppm,

which is normally 0.667.

4-20 mA Inputs (only appears if optional card is installed)

Click on the radio button which best describes the devices you have attached to the optional 4-20

mA input card for each input labeled 1 through 8. Make sure that you select the type of device that

is actually wired to that terminal of the option card!

If you are using 4-20 mA water meters, go to the Water Meter Selection section of the Start Up

Page, select “4-20 mA”, and then click on the “Submit” button at the bottom of the Start Up Page.

This will automatically change 4-20 mA Input 1 to “Make-up Water Meter” and, if applicable,

change 4-20 mA Input 2 to “Bleed Water Meter”. Verify that the meters are actually wired to the

correct terminals.

Not Used should be selected if nothing is connected to that input.

Level should be selected if a continuous level transmitter is attached to that output. For point level

devices, which do not use a 4-20 mA signal, wire into and program with the Digital Inputs section.

Corrosion should be selected if a LPR corrosion-monitoring transmitter is connected to that input.

Other should be selected if the 4-20 mA transmitter connected to that input is anything other than

the previously mentioned ones. Later when you get to the 4-20 mA Input Page, you will be able to

name the input (for example, Phosphate or System Pressure) and also define the Units of Measure

(like mg/l or psi).

Digital Input Assignment (only appears if optional card is installed)

Click on the radio button that best describes the devices that you have connected to the optional

digital input card for each input labeled 1 through 6. Make sure that you select the type of device

that is actually wired to that terminal of the option card!

Not Used should be selected if nothing is attached to that input.

Point Level should be selected if a level switch is connected to that input.

PosiFlow should be selected if a metering pump feed verification device is connected to that

input.

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Walchem WebMaster Manuel d'instructions Page 55