Section 5
Page 5 - 4
HA243821
Issue 5 Mar 98
MODEL 346 INSTALLATION AND OPERATION MANUAL
5.2 TOTALISER OPTION
5.2.1 INTRODUCTION
A totaliser is an electronic integrator, primarily used to record the numeric total over time of a measured value that
is expressed as a rate - (e.g., the number of gallons (since reset), based on a flow rate in gallons per minute).
The totaliser reads the ranged numeric value of its input source once each second. Each reading is divided by the
totaliser factor (usually the number of seconds in the Measured Value rate -/sec, /min, /hr, /day), and added to the
total.
EXAMPLE
A totaliser is reading a gas flow range of 0 to 1200 cubic feet per minute (CFM). At half flow (600 CFM) the flow
rate is 600/60 or 10.0 cubic feet per second. 10 counts will be added to the totaliser each second. A flow rate of
4320 cubic feet per day will give a totaliser input of 4,320/86,400 = 0.05 per second. (86,400 = the number of
seconds is a day ie 60 x 60 x 24).
Counts are added in whole units resulting in one count being added every 20 seconds (20 x 0.05 = 1).
A Totaliser can also be configured to be a Counter responding to contact closures measured by the optional
Contact (event) Inputs (see Section 3.4). Count rates can be up to 50 pulses per second. Count rate scaling is
described with the totaliser factor.
To begin configuration of a totaliser, the up/down arrow keys are used to select a totaliser number between 1 and
6, and the ENTER key is operated.
TOTALISER COUNTER OUTPUT OPTION
This feature permits the use of a separately specified output relay to ‘re-transmit’ the totaliser count for use by an
external counter or sampling system. Output counts can either be on a ‘one-for-one’ basis, with the totaliser
counts (up to 50/second) or a scaled number (e.g. one output count for every 1000 totaliser counts.)
5.2.2 CONFIGURATION PAGES
TOTALISER TYPE
TTN Type
Type
The up/down/ arrow keys are used to choose totaliser type, from OFF, continuous, preset up or preset down.
Note...
A change to any part of the totaliser configuration will cause that totaliser to re-set.
Off
The integrating function is disabled.
Continuous
The input is summed until the totaliser is reset manually, automatically (at a count of 999,999,999)
or by an internal trigger as set up in the appropriate action equation.
Preset down The totaliser will count down from a pre-set number. When zero is reached, the totaliser activates
an internal trigger which can be used for, amongst other things, re-setting the count to the preset
number, and re-starting the count.
Preset up
The totaliser counts from zero up to a pre-set number. When this number is reached, the totaliser
activates an internal trigger which can be used for, amongst other things, re-setting the counter to
zero, and restarting the count.
Once the type has been selected, operation of the ENTER key calls the next totaliser configuration page.
