Introduction - Geokon 4999 Instruction Manual

1. INTRODUCTION

The Model 4999 Terminal Box is intended for use with Geokon Vibrating Wire Sensors
with or without Thermistors. Various models are available:
 Model 4999-11-2S for up to 2 VW Sensors with Thermistors
 Model 4999-11-4S for up to 4 VW Sensors with Thermistors
 Model 4999-11-8S for up to 8 VW Sensors with Thermistors
 Model 4999-16VTS for up to 16 VW Sensors with Thermistors
 Model 4999-32VTS for up to 32VW Sensors with Thermistors
 Model 4999-32VWS for up to 32 VW Sensors only. (Without Thermistors)
The Terminal Box makes it easy to manually connect a Readout Box (GK-404 or
GK-405), to a variety of vibrating wire sensors by means of color-coded terminal posts,
mounted below the rotary switches on the face panel of the Terminal Box, to which the
flying leads (patch cord) of the readout box can be clipped. The rotary switch is used to
select which "channel" or sensor is being read by the Readout Box.
The cables from the sensors are passed into the Terminal Box interior through weather
tight entries mounted on the bottom or side of the enclosure. It is important that any
unused cable entries be sealed off by tightening the unused nylon cord grips onto the
white plastic plugs provided for that purpose.
The sensors are protected from over-voltages by means of Gas Discharge Tubes
mounted on the terminal boards. An earth ground lug is provided on the outside of the
enclosure for connection to an earth ground rod.
The Terminal Box is a NEMA 4X style enclosure, environmentally protected
(weatherproof) by means of a hinged cover that has a seamless "foamed-in-place"
gasket that is pressed firmly against the enclosure when the two clamps holding the
cover are closed. The Terminal Box itself is made from fiberglass reinforced polyester.
Polyester mounting brackets with bolt-holes, on top and bottom of the Terminal Box,
allow it to be bolted to any vertical surface.
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