Microprocessor-Controlled Electro-Pneumatic Regulator
ITV2000
E A S Y P R O G R A M M I N G G U I D E
Page 5
last updated 11/03/03 10:05 AM
A
DJUSTING THE
M
INIMUM
A
ND
M
AXIMUM
P
RESSURES
The ITV allows the user to customize the minimum pressure (zero point) at 0% input
signal and the maximum pressure (span) at 100% input signal. The minimum pressure can be set
as low as 0% and as high as 50% of the full span. The maximum pressure can be set as low as
10% and as high as 100% of the full span.
For example, an ITV203 could be set to output 35 PSI at 0% input signal, and 43 PSI at
100% input signal (there must be at least 8 PSI separation). Similarly, the same ITV203 could be
set to output 0 PSI at 0% input signal, and 8 PSI at 100% input signal.
minimum pressure (zero) adjust
maximum pressure (span) adjust
M
ONITOR
O
UTPUT
The ITV is available with one of three different monitor output signals:
•
ANALOG (ITV20
- 1): Linear analog pressure monitor signal (1~5VDC).
Input impedance:
100K
Ω
or greater
•
NPN DIGITAL (ITV20
- 2): NPN open-collector output. Maximum load current: 30mA
•
PNP DIGITAL (ITV20
- 3): PNP open-collector output. Maximum load current: 30mA
The NPN and PNP digital monitor outputs can be set to function in one of three different ways:
comparator mode
hysteresis mode
self-diagnostic mode
when P1<P2
when P1>=P2
when P1=P2=0
•
The output is on whenever
the outlet pressure is
greater than P1 but less
than P2.
•
The output comes on once
the outlet pressure
reaches P1. The output
will remain on until the
outlet pressure drops to
P2.
•
The output is on whenever
the outlet pressure equals
the commanded pressure.
The output is off whenever
the input signal changes.
E
RROR
M
ESSAGES