8
Sensor and System Wiring Diagrams
9
Hazardous Location Wiring
4-20 mA Programming Wiring
4-20 mA System Wiring
IMPORTANT
: Refer to section 9 for Hazardous Location Wiring.
NOTE
: For APG Modbus programming instructions, please see
MPX user manual. APG Modbus software can be downloaded from
www.apgsensors.com/support.
12-24 Vdc
Out 1
Out 2
Input 1 Input 2 Com
Receiver
Sensor
Sensor
4-20 mA Dual Float Loop Wiring
(MPX-T3 Series)
Input Com
Receiver 1
Input Com
Receiver 2
OR
+
Power Source
(12-24 Vdc)
−
12-24 Vdc
Out 1
Out 2
Sensor
+
Power Source
(12-24 Vdc)
−
12-24 Vdc
Out
4-20 mA Single Float Loop Wiring
(MPX-T2 Series)
Input Com
Receiver
+
Power Source
(12-24 Vdc)
−
12-24 Vdc
Out (1)
Power
Source
(14- 24 Vdc)
Sensor
Out 24V
RST-4100
Load Resistor
(150 Ω to 700 Ω)
Wired in series for
programming.
+
−
Note: a minimum of
14 Vdc is required to
establish communications
with the RST-4100
Programming Module
and APG Modbus software
required for programming
MPX-T2 and MPX-T3
series sensors.
USB to computer
with APG Modbus
software
Out 2
MPX-T2 or
MPX-T3 series
sensor.
Programming configuration is
for programming ONLY. After
programming, sensor must be
reintegrated to 4-20 mA loop
for proper system operation.
Modbus System Wiring
Modbus System Wiring with RST-6001
Power
Supply
+12-24 Vdc
GND
Use Shielded Cable
120 Ω
terminating
resistor
120 Ω
terminating
resistor at
last sensor
V+
B
A
Sensor 1
GND
V+
B
A
Sensor 2
GND
V+
B
A
Sensor 3
GND
Server
Device
RS-485 A
RS-485 B
MPX Modbus
series sensor
MPX Modbus
series sensor
MPX Modbus
series sensor
EARTH
GND
Note: Earth Ground terminal is factory
connected to internal housing ground
lug.
EARTH
GND
EARTH
GND
Power
Supply
+12-24 Vdc
GND
Use Shielded Cable
Equivalent 120 Ω
terminating resistor
internal to RST-6001
120 Ω
terminating
resistor at
last sensor
USB to computer
with APG Modbus
software
RST-6001
Modbus
Controller
V+
B
A
Sensor 1
GND
V+
B
A
Sensor 2
GND
V+
B
A
Sensor 3
GND
A
B
-5V
MPX Modbus
series sensor
+5V
MPX Modbus
series sensor
MPX Modbus
series sensor
Note: An indep12-24 Vdc
power supply is required when
using an RST-6001 Modbus Controller.
The RST-6001 can only supply ±5 Vdc,
not the +12-24 Vdc required by the MPX.
EARTH
GND
EARTH
GND
EARTH
GND
Note: Earth Ground terminal is factory
connected to internal housing ground lug.
IMPORTANT
: For EMI protection on an MPX-T4 or MPX-T5, either
connect the grounding screw (see section 4) to an earth ground, or
ensure that tank mounting of the MPX is grounded.
7
General Care
Your MPX sensor is very low maintenance and will need little care as long as it was installed
correctly. However, in general, you should periodically inspect your MPX unit to ensure the stem
is free of any heavy buildup that might impede the movement of the float(s). If sediment or other
foreign matter becomes trapped between the stem and float(s), detection errors can occur.
If you need to remove the floats(s) from the stem of your MPX, be sure to note the orientation of
the float(s) prior to removal. This will help ensure proper re-installation of the float(s).
Also, ensure that the housing cover is snuggly secured. If the cover becomes damaged or is
misplaced, order a replacement immediately.
8
Repair Information
If your MPX level sensor needs repair, contact us via email, phone, or online chat on our website.
We will issue you a Return Material Authorization (RMA) number with instructions.
•
Phone: 888-525-7300
•
Email: [email protected]
•
Online chat at www.apgsensors.com
DANGER:
WARNING -- POTENTIAL ELECTROSTATIC CHARGING HAZARD - CLEAN ONLY
WITH A DAMP CLOTH;
AVERTISSEMENT -- DANGER DE CHARGE ELECTROSTATIQUE POTENTIEL - NETTOYER
SEULEMENT AVEC UN CHIFFON HUMIDE.
IMPORTANT
: All repairs and adjustments of the MPX-T level sensor must be made by the
factory. Modifying, disassembling, or altering the MPX-T is strictly prohibited.
