1
502-3000 Series Ztron
TM
Point Level Control
Introduction
SECTION 1
INTRODUCTION
The instructions in this manual are for the Drexelbrook
Ztron™ Series Point Level Control with a 402-3000 electronic
unit (also referred to as MKII Ztron).
The label on top of the electronic unit identifies the model
number of the Ztron level control:
402-3000
402-3302
402-3020 (refer to 402-302
X
-LM)
402-3002
402-3400
402-3022 (refer to 402-302
X
-LM)
402-3200
402-3402
402-3202
402-3500
402-3300
402-3502
If there is no model number on the top label of the electronic
unit, it is a 402-2000 type Ztron and the instructions are
included in the 402-2000-LM Instruction Manual. Contact
Drexelbrook’s Service Department at 1-800-527-6297 for a
402-2000-LM.
1.1 System
Description
The Drexelbrook Ztron Level Control (Figure 1-1) includes a
402-3000 series electronic unit and a 700 series sensing
element. Cote-Shield
TM
action is designed into all Ztron level
controls (except 502-3
X
0
X
-918) and enables the instrument
to ignore the effect of build-up or material coating on the
sensing element.
The 402-3000 electronic unit:
• provides double-pole double-throw dry relay contact
closure when material reaches a specific point on the
sensor. The relay contacts may be used to operate
alarms, solenoid valves, or other low power devices.
• provides an optional 0-90 second time delay for agitated
vessels.
The 700-series sensing element:
• is mounted on the tank or in the process.
• provides a change in RF admittance indicating
presence or absence of material.
• with remote-mounted electronics, the change in RF
admittance at the sensing element is transmitted to the
electronic unit through a Drexelbrook 380 Series coaxial
cable.
