HF scientific AccUView Wastewater UV %Transmission Monitor - Manual (Page 25)

To enable the Modbus mode, select
ASCII or RTU. For more information refer to the
Modbus Manual (Catalog #24570). The manual is also available as a free download from
our website at
www.hfscientific.com .
7.4 Configuring the Alarm
A relay is provided and is designed to operate as an independent programmable alarm.
Two types of information must be input to fully program the alarm:
1. The alarm function (HI, LO, or OFF)
2. The alarm set point (level at which the alarm activates)
These are described below:
Alarm Function: The alarm can either be turned OFF or programmed to operate in one
of two different manners:
1. HI alarm: the relay changes state when the measured %T level is higher than the
programmed alarm level for a prescribed amount of time.
2. LO alarm: the relay changes state when the measured %T level is lower than the
programmed alarm level for a prescribed amount of time.
Note: The relay automatically changes state when an internal system failure is detected.
Alarm Set Point: The level at which an alarm activates is called the alarm set point. On
the instrument, the alarm set point is designated as “S/P”. The set point is adjustable to
any valid level over the range of the instrument in steps of 0.1%T.
7.5 Offset Calibration
Refer to section 6.0 for more information on this selection.
AccUView Wastewater (1/09) 19
Rev. 2.9