ROHRBACK COSASCO SYSTEMS CORRATER 9020, User Manual

1

Chapter 1 
Introduction 

The Model 9020 CORRATER

®

 Transmitter and 9020-OEM Transmitter Module are two-

wire CORRATER transmitters which are designed to be directly connected to an 
industrial plant Distributed Control System (DCS) or other 4-20 milliamp receiver for the 
purpose of monitoring corrosion rates and imbalance currents from 2-electrode 
CORRATER probes mounted in water systems.  Please note that the Model 9020 has no 
temperature measurement capability and therefore should not be used with 
CORROTEMP

®

 CORRATER probes. 

 
The Model 9020-OEM (Figure 1) is a complete transmitter module for mounting in a 
customer provided secondary enclosure while the Model 9020 (Figure 2) consists of the 
transmitter module mounted in a NEMA-4X (IP-66) weatherproof enclosure suitable for 
field mounting.  Either is supplied with a five-foot cable with connector which is 
compatible with any CORRATER probe. 
 
The transmitter module is capable of monitoring corrosion rate or imbalance current 
using a single loop, or both measurements can be made by powering both transmitter 
loops. 
 

Figure 1 - 9020-OEM Transmitter Module