User's Manual

Pit Installation
R900 Wall and Pit MIU Installation and Maintenance Guide 13
Figure 11 Antenna Placement for High Traffic Areas
• For best results, Neptune recommends that the MIU be installed in a location
that provides a direct line of site to the path of the meter reader.
• Although the MIU has a cable already attached—either 6 feet or 25 feet long—
some installations can require additional cable. In these cases, the maximum
cable length between the encoder register and MIU depends on the register’s
manufacturer and model. Refer to Table 4 for maximum cable lengths.
Single Pit MIU Installation
The following section describes how to install a single R900 MIU in a pit location.
If you are installing the R900 Pit MIU to read two registers, skip this section.
Table 4 Cable Length and Manufacturer
Encoder Register Maximum Cable Length
Neptune ARB III, IV and V* 300 feet (91 meters)
Neptune ProRead (ARB VI) /E-Coder (ARB VII) 500 feet (152 meters)
Invensys ECRII and ECR III 200 feet (61 meters)
Networked Neptune ProRead (ARB VI) /
E-Coder (ARB VII)
250 feet (76 meters)
* Meets manufacturers’ published specification for wire length between encoder and remote
receptacle.
The steps included in this section describe the installation for one single pit MIU. See “Dual Reg-
ister Applications” on page 20, to install compound units.