Liquid Controls IT200N - Manual (Page 4)

Sponsler, Inc. IT200N Remote Rate Indicator pg. 4 DOC#: MN-200N-D.DOC
INTRODUCTION
General
The Model IT200N Industrial Remote Rate Indicator is a battery powered device that provides flow rate
in any engineering unit. Rate is displayed via a 6-digit liquid crystal display. Selection of the reset
function is accomplished externally by a magnetic field. This particular feature retains the unit's integrity
permitting complete operational control in hazardous environments.
Negatives previously associated with LCD’s – poor cold temperature performances, condensation which
is a byproduct of heaters and display ghosting have all been eradicated by incorporating a low
temperature coefficient LCD (-35
o
C). All monolithic and discrete devices of the IT200N have
temperature specs of –40 to 125
o
C.
In addition, the IT200N provides 1 digital interface output. The scaled pulse output is an open drain
configuration in which the pulse amplitude assumes the level of the host device. The output is a 2ms
negative pulse for each unit of displayed rate.
Theory of Operation
The IT200N amplifies and shapes the incoming pulses generated by the turbine's response to flow. The
amplified pulse train is then divided, factored by a phase locked loop (PLL) and combined with a
timebase circuit for absolute accuracy.
Calibration
Field Calibration is accomplished by incorporating a calibration factor based on the turbine K-Factor.
Divider switches provide divisional increments of 1-99,999. The calibration factor is entered via 5 BCD
switches.
(SPONSLER, INC. STRONGLY RECOMMENDS THOROUGH REVIEW AND
UNDERSTANDING OF THIS MANUAL PRIOR TO INSTALLATION)