20
Dual flow inputs :
The model RT12 has a dual flow input feature which can be configured for one of three
available functions of A+B, A-B or A÷B (ratio).
The dual flow inputs are referred to as “input A” and ”input B” at terminals 1 & 3.
Function A+B
Both inputs are added together and displayed as one for Rate, Resettable & Accumulative
Totals.
Displays Rate : The total of A+B flow rates displayed as one rate.
Reset Total : The total of A+B totals displayed as one total.
Accum. Total : The total of A+B accum.totals displayed as one total.
Outputs Scaled Pulse : Scaled pulse value is relative to the totalised values.
Alarms : Alarms are taken relative to the displayed rate.
Analog Output : 4~20mA output is proportional to the displayed rate.
Function A-B
Input B is subtracted from input A, the resultant is displayed as one for Rate, Resettable &
Accumulative Totals.
Displays Rate : The difference of A-B flow rates displayed as one rate
Reset Total : The difference of A-B totals displayed as one total.
Accum. Total : The difference of A-B accum.tot. displayed as one total.
Outputs Scaled Pulse : Scaled pulse value is relative to the totalised values.
Alarms : Alarms are taken relative to the displayed rate.
Analog Output : 4~20mA output is proportional to the displayed rate.
Function A÷B
Input A is divided by input B, the resultant is displayed as an instantaneous Ratio, Resettable
& Accumulative Totals are independently displayed for both A & B inputs.
Displays Rate : The resultant Ratio between A÷B flow rates
displayed as an instantaneous Ratio.
Reset Total input A : The total of input A.
Reset Total input B : The total of input B.
Accum. Total input A : The Accumulative total of input A.
Accum. Total input B : The Accumulative total of input B.
Outputs Scaled Pulse : The scaled pulse output relates to input A .
* Alarms : Alarms are taken relative to the displayed ratio.
* Analog Output : 4~20mA output is proportional to the displayed ratio.
* Note: The alarm and analog outputs for the A÷B function are set in the initial stages of
programming in relation to rate units eg: setting the analog output range to 4mA = 00.000
litres/min and 20mA = 10.000 litres/min, the analog output will be proportional to the ratio rate
display of 0.000~10.000 ( eg. 4mA @ 0.000 and 20mA @ 10.000 ).
The same set up analogy applies to the alarm settings.
Page 1
TABLE OF CONTENTS
1. INTRODUCTION
1.1 Model number designation 2
1.2 Specifications 3
1.3 Overview 4
1.4 LCD displays 4
2. OPERATION
2.1 Accumulative total display 5
2.2 Resettable total display 5
2.3 Rate display 5
2.4 Low frequency cut-off 5
2.5 Inhibit total function 5
2.6 Keypad function matrix 6
3. INSTALLATION
3.1 Mounting - wall / surface mount 6
- pipe mount 7
- panel mount 7
3.2 Flowmeter connections - unpowered sensors 8
- powered sensors 9
3.3 Wiring connections - external powering 10
- 4~20mA loop powering 10
- wiring requirements 10
- pulse outputs 11
- alarm outputs 11
- remote switches (refer page) 18
4. PROGRAM PARAMETERS ( models RT11& RT12 )
4.1 PIN number program protection 12
4.2 Resetting accumulative total 12
4.3 Engineering units 12
4.4 K-factor (scale factor) 12
4.5 Rate conversion factor 12
4.6 Rate dampening ( see response graph page 19 ) 12 & 19
4.7 Low frequency cut-off ( refer clause 2.4 page 5 ) 5
4.8 Pulse outputs ( scaleable or non-scaleable ) 12
4.9 Non linearity correction ( NLC) Linearisation 12
4.10 Presetting battery power levels 13
5. ADDITIONAL PROGRAM PARAMETERS ( model RT12 only )
5.1 Analog output 13
5.2 Flow alarms 13
5.3 Flow alarm deadband 13
5.4 Dual flow inputs 13 & 20
6. PROGRAMMING FLOW CHART
6.1 Model RT11& RT12 program levels 1~7 14
Model RT11& RT12 program levels 8~13 15
6.2 Model RT12 program levels 14~24 16
6.3 Program detail record 17
7. TERMINAL LAYOUT, SELECTION LINKS & REMOTE SWITCHES 18
8. ALPHABETICAL INDEX 21
To Next Page
Loading...