Ametek Z-tron III Manual de usuario
Leader in
Level Measurement
For Assistance Call 1-800-527-6297
Outside North America + 215-674-1234
Installation and
Operating Instructions
Series Z0X-2
Z-tron IIITM Level Control
U.S. and Canada: 1-800-553-9092
24-Hour Service: 1-800-527-6297
International: +1 215-674-1234
Fax: +1 215-674-2731
Website: www.drexelbrook.com
AMETEK Drexelbrook makes no warranty of any kind with regard to the material contained
in this manual, including, but not limited to, implied warranties or fitness for a particular
purpose. Drexelbrook shall not be liable for errors contained herein or for incidental
or consequential damages in connection with the performance or use of material.
Copyright 2008 AMETEK Drexelbrook
Series Z0X-2
Z-tron IIITM Level Control
EDO# 5-10-123
Z0X-2-LM
Issue#11
205 Keith Valley Road, Horsham, PA 19044
U.S. and Canada: 1-800-553-9092
24-Hour Service: 1-800-527-6297
International: +1 215-674-1234
Fax: +1 215-674-2731
Website: www.drexelbrook.com
An ISO 9001 Certified Company
Table of Contents
Table of Contents
Section 1: Introduction ................................................................................................1
1.1 System Description ......................................................................................1
1.2 Technology...................................................................................................1
1.3 Model Number ............................................................................................. 2
Section 2: Installation.................................................................................................. 3
2.1 Unpacking ....................................................................................................3
2.2 Mounting the Level Control .........................................................................3
2.3 Mounting Dimensions .................................................................................. 5
2.4 Power Wiring................................................................................................6
2.5 Relay Wiring.................................................................................................8
Section 3: Operation.................................................................................................... 9
3.1 Setpoint Control ........................................................................................... 9
3.2 Time Delay Control ......................................................................................9
3.3 Time Delay Action........................................................................................10
3.4 Failsafe ........................................................................................................10
3.5 Start-up ........................................................................................................ 10
Section 4: Calibration ..................................................................................................11
4.1 Calibration in Conducting Material ...............................................................11
4.2 Calibration in Insulating Material [Horizontal Mount].................................... 11
4.3 Calibration in Insulating Material [Vertical Mount] ........................................12
Section 5: Troubleshooting ......................................................................................... 13
5.1 Introduction ..................................................................................................13
5.2 Testing Electronic Unit ................................................................................. 13
5.3 Testing Sensing Element ............................................................................. 13
5.4 Testing Relay Circuits...................................................................................15
5.5 Possible Problems and Causes ...................................................................16
5.6 Factory Assistance.......................................................................................17
5.7 Field Service ................................................................................................17
5.8 Customer Training ........................................................................................17
5.9 Equipment Return........................................................................................18
Section 6: Specifications.............................................................................................19
Appendix A: Shortening or Lengthening the Sensing Element.................................. A-1
Section 1
Introduction
1
Section 1: Introduction
These instructions are for the AMETEK Drexelbrook
Z-tron III™ Series Point Level Control.
The label on top of the electronic unit identies the model number of the
Z-tron III level control.
If the model number on the electronic unit is a 402-3000, the
instructions are included in the 502-3000-LM Instruction Manual.
Both of these manuals can be downloaded from our resource library at
www.Drexelbrook.com
1.1 System Description
Cote-Shield™ action is designed into all Z-tron III level controls and
enables the instrument to ignore the effect of buildup or material coating
on the sensing element.
The electronic unit:
• Provides double-pole double-throw dry relay contact closure when
material reaches a specic point on the sensor. The relay contacts
may be used to operate alarms, solenoid valves, or other low power
devices.
• Provides a 0-60 second time delay for agitated vessels.
The 700-series sensing element:
• Is mounted on the tank or in the process.
• Provides a change in radio frequency (RF) admittance indicating
presence or absence of material.
1.2 Technology
In a simple capacitance probe type sensing element, when the level rises
and material covers the probe, the capacitance within the circuit between
the probe and the medium (conductive applications) or the probe and the
vessel wall (insulating applications) increases. This is due to the dielectric
constant (k) of the material, which causes a bridge misbalance. The signal
is demodulated (rectied), amplied and the output is increased. There
are drawbacks, however, especially when there is coating of the probe.
An RF Admittance level transmitter is the next generation. Although
similar to the capacitance concept, The Z-tron employs a radio frequency
signal and adds the Cote-Shield™ circuitry within the Electronics Unit.
This patented Cote-Shield™ circuitry is designed into Z-tron series and
enables the instrument to ignore the effect of buildup or material coating
on the sensing element. The sensing element is mounted in the vessel
and provides a change in RF admittance indicating presence or absence of
material.
The Cote-Shield™ element of the sensor prevents the transmission of
RF current through the coating on the sensing element. The only path
to ground available for the RF current is through the material being
measured.
The result is an accurate measurement regardless of the amount of
coating on the probe, making it by far the most versatile technology, good
for very wide range conditions from cryogenics to high temperature, from
vacuum to 10,000 psi pressure, and works with all types of materials.
k
air
A
d
Ckmedia
C=kA
d
C = k A
d
A
k
air
d
C
kmedia
Figure 1-1
Capacitance Probe
(Insulating Media)
Figure 1-2
RF Admittance Probe
with Cote-Shield
2
Z0X-2 Series Z-tron IIITM Point Level Control
Technology
ZRF Admittance
Reserved for future use
0
Input
0120Vac
124Vdc
3230Vac
Output
2Double Pole Double Throw Relay
Sensing Element
Application Sensing Element Pressure/Temperature Wetted Parts
05 General 700-0206-201 14bar@121°C 316SS
Purpose (200psi@250°F) & PEEK
Cote-Shield
TM
Length
A10 inch/254mm
B3.5 inch/88.9mm
C2 inch/51mm
I6 inch/150mm
{
Insertion Length (IL)
A6 inch/152mm
B12 inch/305mm
C18 inch/457mm
D36 inch/914mm
E
48 inch/1219mm
F
60 inch/1524mm
H72 inch/1829mm
ZOther
1.3 Model Number
Note:
Cote-Shield should extend through
Nozzle + Typical "Wall Buildup" +
2 Inches
Spare Parts
120VAC Module - 385-50-11
240VAC Module - 385-50-12
24VAD Module - 385-50-13
Installation
3
Section 2: Installation
2.1 Unpacking
Carefully remove the contents of the shipping carton and
check each item against the packing list before destroying
any packing materials. If there is any shortage or damage,
report it to the factory at 1-800-527-6297 (US and Canada)
or + 215-674-1234 (International).
2.2 Mounting the Level Control
The Z-tron III Level Control is available with the
electronic unit and sensing element as a single integral
assembly. Extended sensing element lengths and special
mountings can be provided to t specic applications.
• The Z-tron III Level Control is designed for industrial
applications, but it should be mounted in a location as
free as possible from vibration, corrosive atmospheres,
or any possibility of mechanical damage.
• For convenience when adjusting, place the electronic
unit in a reasonably accessible location. Ambient
temperature should be between -40°F and 145°F (-40°C
to 63°C).
• It may be mounted either vertically or horizontally. See
Figures 2-1 and 2-2.
• Avoid mounting closer than 1 inch to any tank
structure. Material bridging from structure to sensing
element can cause false alarms. Close proximity to tank
structure also increases the sensing element’s standing
capacitance.
• When installing ange-mounted sensing elements, keep
mating surfaces and bolts free of paint and corrosion to
ensure proper electrical contact with vessel. Avoid using
excessive amounts of TFE tape when installing threaded
sensing elements.
• Install systems with threaded NPT connection via
wrench ats on the process connection ONLY.
• The actual mounting location often depends on the
placement of nozzles or openings into the vessel. Do not
mount the instrument through a nozzle which exceeds
the Cote-Shield element on the sensing element. See
Figure 2-1.
• Protect the insulation on the sensing element against
cuts and scrapes during installation.
Figure 2-3 provides typical mounting dimensions.
4
Z0X-2 Series Z-tron IIITM Point Level Control
WRONG CORRECT
Conduit
Breather
Drain
All Connections Sealed
and Gaskets In Place
WRONG CORRECT
CONDULET
Packing
Gland
Assembly
Do Not
Disturb!
Hold here when
tightening
Condulet
Hold here to install
or remove Sensing
Element from
Vessel
Figure 2-1
Z-tron III Level Control Mounting Recommendations
2.2 Mounting the Level Control (continued)
NOZZLE
NOZZLE
Wall build-up
does not extend
past first
insulator.
Cote-shield must
extend through
nozzle and wall
build-up by 2".
Wrong
Nozzle too long;
Cote-shield too short.
Factory-supplied Cote-shield
extends through nozzle and
wall build-up.
Best
Best
No Nozzle
Good
Long Nozzle
Figure 2-2
Z-tron III Level Control Installation Guidelines
WRONG CORRECT
Conduit
Breather
Drain
All Connections Sealed
and Gaskets In Place
WRONG CORRECT
CONDULET
Packing
Gland
Assembly
Do Not
Disturb!
Hold here when
tightening
Condulet
Hold here to install
or remove Sensing
Element from
Vessel
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