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DCM 200 Installation

Page 31

6.8. Units for Volumes & Temperatures

6.8.1. Metric – US Units Selection

Controller units are selected by the Metric/US Units keypad and/or browser switch.

Although the increasing use of ppm controls and frequency controlled pumps moves more sites to Metric units,

the familiarity with GPH, GPD, and GPM recirculation rates indicates that sites will continue to use both unit

systems.

This application note details how the controller applies the Metric/US Units switch setting.

Caution: Sensor values, meter and pumped volumes are logged with the units applicable at the time of log

entry. Typically the Metric/US Units switch is set once, when the controller is commissioned, since changing

units causes problems with interpreting data logs, & adjusting feed, timeout and alarm setpoints.

6.8.2. Water Meter Volumes

The measured and displayed water meter volumes, volume per contact, K Factor and the high and low alarms

are all in the units set by the Metric/US Units switch.

US Units: All volumes measured in Gallons.

Metric: All volumes in Liters

Zeroing a Water Meter

Switching a water meter to a contact set and then back to a water meter will zero the meter and set the default

units to L or Gal, depending on the Metric/US Units switch.

6.8.3. Temperatures

Temperature default units are set by the Metric/US Units switch for each input, which measures a temperature

and is then used for the pH sensor, which may be temperature compensated.

Default offsets & gains for thermal sensors are set to the defaults corresponding to the Metric/US Units

switch.

US Units: Temperature units = ‘F’. Metric: Temperature units = ‘C’.

Caution: Remember that even if you change the default units on a temperature input, the controller internally

applies the units set by the Metric/US Units switch.

ProMinent strongly recommends that you do not change the default units on any temperature used for control

or for temperature compensation of pH. Errors in both temperature calibration and tracking over temperature

for temperature compensated pH will result.

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Black & Decker DCM200C Guía de instalación Pagina 31