E+E Elektronik Modbus MOP301 User manual

BA_MOP301 // v1.0 // Modification rights reserved
User Manual
MOP301
Digital Moisture in Oil Immersion Probe
up to 120 °C (248 °F)

E+E Elektronik Ges.m.b.H. doesn‘t accept warranty and liability claims neither upon this publication nor in case of improper
treatment of the described products.
The document may contain technical inaccuracies and typographical errors. The content will be revised on a regular basis.
These changes will be implemented in later versions. The described products can be improved and changed at any time
without prior notice.
© Copyright E+E Elektronik Ges.m.b.H. All rights reserved.
EMC note USA (FCC):
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the
FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment
is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required
to correct the interference at his own expense.
EMC note Canada (ICES-003):
CAN ICES-3 (A) / NMB-3 (A)

CONTENT
1 General .................................................................................................................................................4
1.1 Explanation of Symbols.................................................................................................................................4
1.2 Safety Instructions.........................................................................................................................................4
1.2.1 General Safety Instructions..................................................................................................................................4
1.2.2 Intended Use........................................................................................................................................................4
1.2.3 Mounting, Start-up and Operation........................................................................................................................5
1.3 Environmental Aspects..................................................................................................................................5
2 Scope of Supply ..................................................................................................................................5
3 Product Description ............................................................................................................................6
3.1 General..........................................................................................................................................................6
3.2 Dimensions....................................................................................................................................................7
3.3 Electrical Connection.....................................................................................................................................7
4 Mounting and Installation...................................................................................................................8
4.1 Installation of the Probe Directly in the Process ...........................................................................................8
4.2 Probe Installation with Ball Valve ..................................................................................................................9
4.3 Sampling Cell with Shut-off Function ..........................................................................................................10
5 Setup and Adjustment ...................................................................................................................... 11
5.1 PCS10 Product Configuration Software ......................................................................................................11
5.2 Modbus Setup .............................................................................................................................................12
5.3 Modbus Register Map .................................................................................................................................13
5.4 Freely Configurable Custom Modbus Map..................................................................................................13
5.5 Device Status Indication..............................................................................................................................14
5.6 Modbus RTU Examples ..............................................................................................................................15
6 Maintenance and Service .................................................................................................................17
6.1 Cleaning ......................................................................................................................................................17
6.2 Repairs ........................................................................................................................................................17
6.3 Moisture and Temperature Adjustment and Calibration ..............................................................................17
6.4 Spare Parts .................................................................................................................................................17
7 Accessories .......................................................................................................................................18
8 Technical Data ...................................................................................................................................19

4User Manual MOP301 Digital Moisture in Oil Immersion Probe
1 General
This user manual serves for ensuring proper handling and optimal functioning of the device. The user
manual shall be read before commissioning the equipment and it shall be provided to all staff involved
in transport, installation, operation, maintenance and repair. The user manual may not be used for the
purposes of competition without the written consent of E+E Elektronik and may not be forwarded to third
parties. Copies may be made for internal purposes. All information, technical data and diagrams included
in these instructions are based on the information available at the time of writing.
The manufacturer or his authorized agent can be only be held liable in case of willful or gross negligence.
In any case, the scope of liability is limited to the corresponding amount of the order issued to the
manufacturer. The manufacturer assumes no liability for damages incurred due to failure to comply with the
applicable regulations, operating instructions or the specified operating conditions. Consequential damages
are excluded from the liability.
Please find this document and further product information on our website at
www.epluse.com/mop301.
1.1 Explanation of Symbols
This symbol indicates safety information.
It is essential that all safety information is strictly observed. Failure to comply with this information can lead
to personal injuries or damage to property. E+E Elektronik assumes no liability if this happens.
This symbol indicates instructions.
The instructions shall be observed in order to reach optimal performance of the device.
1.2 Safety Instructions
1.2.1 General Safety Instructions
■ Avoid any unnecessary mechanical stress and inappropriate use.
■ When replacing the filter cap make sure not to touch the sensing elements.
■ The device must be operated with the filter cap on at all times.
■ For sensor cleaning and filter cap replacement please see “Cleaning Instructions” at www.epluse.com
■ Installation, electrical connection, maintenance and commissioning shall be performed by qualified
personnel only.
■ Use the MOP301 only as intended and observe all technical specifications.
■ The device is designed for operation with class III supply (EU) and class 2 supply (NA).
■ Do not use MOP301 in explosive atmosphere or for measurement of aggressive gases.
■ Do not apply the nominal voltage to the data lines.
The device is not appropriate for safety, emergency stop or other critical applications where device
malfunction or failure could cause injury to human beings.
1.2.2 Intended Use
The MOP301 is dedicated for reliable and accurate monitoring of lubrication, hydraulic and insulation oils
as well as diesel fuel. In addition to highly accurate measurement of water activity (aw) and temperature
(T), the MOP301 calculates the absolute water content (x) in ppm.
The probe can be used up to 120 °C (248 °F), 20 bar (290 psi) and is available with either ISO or NPT slide
fitting, which allows for variable immersion depth. The mounting and installation methods described in
chapter 4 Mounting and Installation shall be used.
The manufacturer cannot be held responsible for damages as a result of incorrect handling, installation
and maintenance of the device.
Unauthorized modifications of the product lead to loss of all warranty claims. The device may only be
powered as described in this manual.

5
User Manual MOP301 Digital Moisture in Oil Immersion Probe
1.2.3 Mounting, Start-up and Operation
The MOP301 moisture in oil probe has been produced under state of the art manufacturing conditions,
has been thoroughly tested and has left the factory fulfilling all safety criteria. The manufacturer has taken
all precautions to ensure safe operation of the device. The user must ensure that the device is set up
and installed in a manner that does not have a negative effect on its safe use. The user is responsible
for observing all applicable safety guidelines, local and international, with respect to safe installation and
operation on the device. This user manual contains information and warnings that must be observed by the
user in order to ensure safe operation.
■ Mounting, start-up, operation and maintenance of the device may be performed by qualified staff only.
Such staff must be authorized by the plant operator to carry out the mentioned activities.
■ The qualified staff must have read and understood this user manual and must follow the
instructions contained within.
■ All process and electrical connections shall be thoroughly checked by authorized staff before putting the
device into operation.
■ Do not install or start-up a device supposed to be faulty. Make sure that such devices are not
accidentally used by marking them clearly as faulty.
■ A faulty device may only be investigated and possibly repaired by qualified, trained and authorized staff.
If the fault cannot be fixed, the device shall be removed from the process.
■ Service operations other than described in this user manual may only be performed by the manufacturer.
1.3 Environmental Aspects
Products from E+E Elektronik® are developed and manufactured observing of all relevant requirements
with respect to environment protection. Please observe local regulations for the device disposal.
For disposal, the individual components of the device must be separated according to local recycling
regulations. The electronics shall be disposed of correctly as electronics waste.
2 Scope of Supply
■ MOP301 – Moisture in Oil Probe with Digital Interface according to ordering code
■ Inspection certificate according to DIN EN 10204-3.1
■ Quick guide

6User Manual MOP301 Digital Moisture in Oil Immersion Probe
3 Product Description
3.1 General
The MOP301 is a robust probe for moisture in oil and temperature measurement. Its IP66 rating and the
E+E proprietary sensor leads protection make it ideal for highest requirements. It features a moisture in
oil measuring range of 0...1 aw, a temperature measuring range of -40...120 °C (-40...248 °F) and a 20 bar
(290 psi) pressure rating. Measurement is possible within oil pipes as well as in almost still oil.
The MOP301 is typically deployed in monitoring of lubrication, hydraulic and insulation oils as well as diesel
fuel in equipment and machinery. The oil to be monitored may be mineral, synthetic or biodegradable.
Installation is simplified by various mounting options which are supported by E+E accessories.
The MOP301 provides the measured data at its digital RS485 interface via Modbus RTU protocol. The
M12x1 connector links the probe to the digital infrastructure.
Fig. 1 MOP301 Type T10, 20 bar (290 psi)
Filter cap with sensing elements underneath
Pull-out protection
Fixture nut for slide fitting
Process connection thread
Insertion limitation
Encapsulated M12 plug
Probe cable, oil resistant

7
User Manual MOP301 Digital Moisture in Oil Immersion Probe
3.2 Dimensions
T4
T10
code “probe length”1)
code “cable length”1)
32
(1.3)
∅12
(0.5)
15
(0.6)
1) Refer to ordering guide
Type T4
45
(1.8)
16
(0.6)
∅15 (0.6)
M12x1
Fig. 2 MOP301 Type T4
Probe length
[mm (inch)]
Min. insertion depth
[mm (inch)]
Max. insertion depth
[mm (inch)]
200 (7.9) 23 (0.9) 164 (6.5)
400 (15.7) 23 (0.9) 364 (14.3)
T4
T10
∅13
(0.5)
Code “probe length”1)
Code “cable length”1)
32
(1.3)
15
(0.6)
1) Refer to ordering guide
∅12
(0.5)
Insertion depth
Type T10, 20 bar (290 psi)
45
(1.8)
16
(0.6)
∅15 (0.6)
M12x1
Fig. 3 MOP301 Type T10, pressure tight up to 20 bar (290 psi)
3.3 Electrical Connection
Important note:
The manufacturer cannot be held responsible for personal injuries or damage to property as a result of
incorrect handling, installation, wiring, power supply and maintenance of the device.
The relations of electrical potential between a bus system and an MOP301 probe are characterized by the
following properties:
■ The bus connection is not electrically isolated from the supply connection
■ The MOP301 is not electrically isolated from the supply voltage
■ Each MOP301 can be supplied separately
Pin number Function
1Supply voltage
24VDCclassIII (Europe) / class2(NorthAmerica)
2B RS485 (D-)
3GND
4A RS485 (D+)
M12 device plug
front view
1 2
34
Tab. 1 MOP301 connection

8User Manual MOP301 Digital Moisture in Oil Immersion Probe
4 Mounting and Installation
The probe can be installed in applications such as oil storages with almost non-moving oil or as well in
circulation pipes with moving oil.
Please note:
For installation in high voltage equipment, e.g. in power transformers, there may be the danger of electrical
shock. Always chose the installation depth so that the required safety distances between the MOP301
probe and any electrically live parts are respected.
If the MOP301 is installed in equipment with moving parts, e.g. in gears, it has to be ensured that the probe
does not touch any of these parts.
In moving oil, the mechanical stress on the probe is minimized by placing only the filter cap into the flow. In
systems with mechanical oil contaminants, the sensor may get installed only behind an appropiate filter.
Please note: To maintain its integrity, the probe cable must not be routed over sharp edges. The cable’s
minimum bend radius is 5x the cable diameter in fixed installations and 10x the cable diameter when
occasionally flexing the cable.
When mounting an MOP301-T4 by means of ducts, make sure that precautions are taken to prevent the
sensor from shooting out. The internal ducting (to the electronics) is suitable for up to 20 bar (290 psi). The
respective feedthrough determines the actual working pressure (<20 bar (<290 psi)). As a rule, non cross-
section-constricting and cross-section-constricting (cut-in) screw connections may be used; cross-section-
constricting screw connections are only permitted in the rear part as shown in the sketch below (grey area
from 32 + 150 mm from the probe tip; clamping is permitted in the grey marked area only, too).
32
(1.3)
150
(5.9)
▪ Cross-section-constricting screw connections
▪ Clamping zone
Probe cable
Fig. 4 MOP301 Type T4
4.1 Installation of the Probe Directly in the Process
stop valve stop valve
1/2" ISO or 1/2" NPT
metal sealing ring (ISO)
inside diameter
≥ 13.1 mm (0.55")
Type T10 in fixed installation
Fig. 5 Installation of the MOP301 probe directly into the process
For direct probe installation, shut-off valves shall be placed on both sides of the probe insert. This allows
the sensor probe to be easily removed for maintenance and calibration.
For direct installation into a pressure chamber, make sure that the pressure in the chamber
and the ambient pressure are equal before removing the probe. The temperature during probe installation
may deviate by max. ±40 °C (±72 °F) from the regular temperature during normal operation.

9
User Manual MOP301 Digital Moisture in Oil Immersion Probe
Replace the metal sealing ring (see Fig. 5) by a new one every time before re-installing the probe.
Probe installation steps
■ Close both shut-off valves.
■ Place the sensor probe into the probe insert and adjust the immersion depth.
■ Tighten the lock nut with a torque of 30 Nm.
■ Open the valves.
Strictly Observe the tightening torque. A torque lower than 30 Nm results in a smaller retention force of
the clamping sleeve. This leads the risk of sudden expulsion of the sensing probe due to the pressure.
A torque higher than 30 Nm may lead to permanent deformation of the clamping sleeve and the sensing
probe. This would make the removal and re-installation of the probe difficult or even impossible.
4.2 Probe Installation with Ball Valve
Ball valve HA050101, HA050104
The ball valve allows for installation and removal of the probe without process interruption. For mounting
into the pipe, the ball valve shall be installed perpendicular to the flow direction.
The two metal sealing rings (see Fig. 6) shall be replaced every time prior to re-installing the probe.
The temperature during probe installation may deviate by max. ±40 °C (±72 °F) from the regular temperature
during normal operation.
Probe installation steps (see Fig. 6)
■ Install the probe into the ball valve while the ball valve is closed.
■ Open the ball valve.
■ Slide the probe through the ball valve to the desired immersion depth. Depending on the process
pressure additional tools may be necessary for pushing the probe into the process. Make sure not to
damage the probe and the cable.
■ Tighten the lock nut with a torque of 30 Nm.
Strictly observe the tightening torque. A torque lower than 30 Nm results in a smaller retention force of the
clamping sleeve. As a result, there is the risk that the sensing probe will suddenly be ejected due to the
pressure. A torque higher than 30 Nm may lead to permanent deformation of the clamping sleeve and the
sensing probe. This would make the removal and re-installation of the probe difficult or even impossible.
metal sealing ring
(as a standard
contained with
the probe)
metal sealing ring
(as a standard contained
with the ball valve set)
1/2" ball valve
extension
(not available for NPT
thread)
inside diameter
≥ 13.1 mm (0.55")
clamping sleeve
lock nut
adapter
body
sealing element 2
sealing element 1
Type T10 in ball valve
Fig. 6 Installation of the probe by utilizing the ball valve set

10 User Manual MOP301 Digital Moisture in Oil Immersion Probe
Removing the probe
■ Hold the probe firmly so that it is not suddenly ejected when the lock nut is released. Make sure not to
bend and damage the probe cable.
■ Loosen the lock nut slowly with a spanner (spanner size 24) until the probe is pushed out by the system
pressure. Do not loosen the lock nut completely, but only until the probe slides out by itself. If the system
is almost pressureless, pull out the sensor slightly.
■ After the probe has been pushed out of the process up to the stop, close the ball valve.
■ Remove the probe from the ball valve.
Observe the correct positioning of the sealing element 1 before reinstalling the probe.
Replacement of the sealing element
In case of repeated installations and removals the sealing element 1 might be damaged. It can be replaced
by the user.
4.3 Sampling Cell with Shut-off Function
Sampling cell with shut-off function, PN40, DN25 HA050109
The sampling cell with shut-off function is designed for placing a MOP301 in a bypass oil sampling or
as well directly into the process. In both cases, the sampling cell could be moved into the oil flow or in
service position by interupting the oil flow. When closing the G 1/2" ISO sensor port with a sealing plug,
the sampling cell with shut-off function works like a ball valve. Using the sampling cell with shut-off function
works like the method described in chapter 4.1 Installation of the Probe Directly in the Process, however
without the need of stop valves in the upstream and downstream of the measurement point.
Technical data of the sampling cell1)
Pipe thread: Rp / Whitworth thread according to EN 10226 (old DIN 2999)
Senor port thread: G 1/2" ISO
Operating pressure: 40 bar (at max. 80 °C) / 580 psi (at max. 176 °F)
Temperature range: -20...180 °C (-4...356 °F)
Wettet parts: Stainless steel 1.4408 & PTFE
1) Please note that specifications of probe and sampling cell may restrict each other in terms of temperature and pressure
application range.
Replace the metal sealing ring (see Fig. 6) by a new one every time before re-installing the probe.The
temperature during probe installation may deviate by max. ±40 °C (±72 °F) from the regular temperature
during normal operation.
Probe installation steps
■ Shut off the valve
■ Place the sensor probe into the probe insert and adjust the immersion depth
■ Tighten the lock nut with a torque of 30 Nm
■ Open the valve
Strictly observe the tightening torque. A torque lower than 30 Nm results in a smaller retention force of
the clamping sleeve. This leads the risk of sudden expulsion of the sensing probe due to the pressure.
A torque higher than 30 Nm may lead to permanent deformation of the clamping sleeve and the sensing
probe. This would make the removal and re-installation of the probe difficult or even impossible.
By removing the probe, close first the shut-off valve. Before openening the valve, ensure that the sensor
port contains a sensor or is closed by a sealing plug.

11
User Manual MOP301 Digital Moisture in Oil Immersion Probe
Type T10 in sampling cell
with shut-off function
Fig. 7 Sampling cell with shut-off function position “open” (left) and position “closed” (right)
5 Setup and Adjustment
The MOP301 is ready to use and does not require any configuration by the user. The factory setup of
MOP301 corresponds to the type number ordered. Please refer to the data sheet at www.epluse.com/
mop301. The user can change the factory setup with the help the PCS10 Product Configuration Software
and the Modbus configuration adapter (order code HA011018). Refer to chapter 5.1 below.
5.1 PCS10 Product Configuration Software
The PCS10 provides a convenient graphical user interface to the MOP301. To use the software for
performing adjustments and changes in settings, please proceed as follows:
1. Download the PCS10 Product Configuration Software from www.epluse.com/pcs10 and
install it on the PC.
2. Connect the MOP301 to the PC using the Modbus configuration adapter.
3. Start the PCS10 software.
4. Follow the instructions on the PCS10 opening page for scanning the ports and identifying the
connected device.
5. Click on the desired setup or adjustment mode from the main PCS10 menu on the left. Follow the
online instructions of the PCS10 which are displayed when clicking the “Tutorial” button.
6. Changes are uploaded to the probe by pressing the “Sync” button.

12 User Manual MOP301 Digital Moisture in Oil Immersion Probe
Please note: The MOP301 may not be connected to any additional power supply when using the Modbus
configuration adapter HA011018.
HA011018
PC
Fig. 8 Configuration
Besides an individual probe naming, the communication parameters may be changed and the custom
Modbus map can be configured. Refer to chapter 5.4 Freely Configurable Custom Modbus Map.
There is a separate menu item for setting the oil parameters. An oil library with up to 50 entries may be
created. The library may be exported and imported and an appropriate parameter set may be uploaded to
the probe.
A 1- and 2-point adjustment may be carried out and the factory setup may be restored again. See chapter
6.3 Moisture and Temperature Adjustment and Calibration.
The configuration of an individual probe may be exported and imported.
5.2 Modbus Setup
Factory settings Selectable values (via PCS10)
Baud rate 9600 9600, 19200, 38400, 57600, 76800, 115200
Data bits 8 8
Parity Even None, odd, even
Stop bits 1 1, 2
Modbus address 70 1...247
Tab. 2 Modbus default settings
Device address, baud rate, parity and stop bits can be set via:
1. PCS10 Product Configuration Software and the Modbus configuration adapter HA011018.
The PCS10 can be downloaded free of charge from www.epluse.com/pcs10.
2. Modbus protocol in the register 1 (0x00) and 2 (0x01).
See Application Note Modbus AN0103 (available at www.epluse.com/mop301).
The serial number as ASCII-code is located in read-only registers 1 - 8 (0x00 - 0x07, 16 bits per address).
The firmware version is located in register 9 (0x08) (bit 15...8 = major release; bit 7...0 = minor release).
The sensor name is located in register address 10 (0x09).
Please note: When reading the serial number or the sensor name, it is always necessary to read all 8
registers, even if the desired information requires less.
Please note: For obtaining the correct floating point values, both registers have to be read within the same
reading cycle. The measured value can change between two Modbus requests, therefore exponent and
mantissa may get inconsistent.
Communication settings (INT16)
Parameter Register number1) [Dec] Register address2) [Hex]
Write register: function code 0x06
Modbus address 1 0x00
Modbus protocol settings3) 2 0x01
1) Register number starts from 1.
2) Protocol address starts from 0.
3) For Modbus protocol settings see Application Note Modbus AN0103 (available at www.epluse.com/mop301).
Tab. 3 MOP301 communication settings registers

13
User Manual MOP301 Digital Moisture in Oil Immersion Probe
Device information (INT16)
Parameter Register number1) [Dec] Register address2) [Hex]
Read register: function code 0x03 / 0x04
Serial number (as ASCII) 1 0x00
Firmware version 9 0x08
Sensor name 10 0x09
Device status (bit decoded)3) 602 0x259
1) Register number starts from 1.
2) Protocol address starts from 0.
3) See chapter 5.5 Device Status Indication.
Tab. 4 MOP301 device information registers
5.3 Modbus Register Map
The measured data is saved as a 32 bit floating point values (data type FLOAT32) and as 16 bit signed
integer values (data type INT16).
FLOAT32:
Parameter Unit Register number1) [Dec] Register address2) [Hex]
Read register: function code 0x03 / 0x04
Water activity aw - 1135 0x46E
Water content x ppm 1141 0x474
Temperature T °C 1003 0x3EA
°F 1005 0x3EC
Saturation % 1137 0x470
Oil parameter A - 0224 0xDF
Oil parameter B - 0226 0xE1
Write register: function code 0x10
Oil parameter A3) - 0101 0x64
Oil parameter B3) - 0103 0x66
1) Register number starts from 1
2) Register address starts from 0
3) Examples: Writing Parameter A -2663.30005 decimal: 46 10 00 64 00 02 04 74 CD C5 26 E3 44
Writing Parameters A and B -1663.30005 and 7.3705 decimal: 46 10 00 64 00 04 08 E9 9A C4 CF DB 23 40 EB CA 19
If two parameters are to be uploaded, it is recommended to write them with a single command.
Tab. 5 MOP301 FLOAT32 measured data registers
INT16 (read register):
Parameter Unit Scale3) Register number1) [Dec] Register address2) [Hex]
Read register: function code 0x03 / 0x04
Water activity aw - 1000 4068 0xFE3
Water content x ppm 0.1 4071 0xFE6
Temperature T
°C 100 4002 0xFA1
°F 50 4003 0xFA2
°K 50 4005 0xFA4
Saturation % 10 4069 0xFE4
1) Register number starts from 1
2) Register address starts from 0
3) Examples: For scale 100, the reading of 2550 means a value of 25.5. For scale 50, the reading of 2550 means a value of 51.
Tab. 6 MOP301 INT16 measured data registers
5.4 Freely Configurable Custom Modbus Map
It is possible to map measured value/status registers arbitrarily in a block with up to 20 registers provided
for this purpose. This means that registers of interest may be mapped in an area with consecutive
registers, so that important values can be queried with a single command in one block.
The custom map can be configured via:
1. PCS10 Product Configuration Software and the Modbus configuration adapter HA011018.
The PCS10 can be downloaded free of charge from www.epluse.com/pcs10.
2. Modbus protocol commands, refer to the example in chapter 5.6 Modbus RTU Examples.

14 User Manual MOP301 Digital Moisture in Oil Immersion Probe
The register block for the configuration of the customisable Modbus map consists of the registers 6001
(0x1770) to 6010 (0x1779). For the blockwise query of the measured values behind Modbus registers 3001
(0xBB8) to 3020 (0xBCB), the firmware accesses this configuration area and thus gets the information
which measured value/status registers are to be output. A maximum of 10 user-defined registers can be
mapped. The table below shows an example:
Registers ... ... with these
assigned measurands ... ... map to registers ... ... mirrored from source registers
Dec Hex Meas. Unit Type Dec Hex Dec Hex
Function code 0x10 Function code 0x03 / 0x04
6001 0x1770 Status - INT16 3001 0xBB8 602 0x259
6002 0x1771 T °C FLOAT32 3002 0xBB9 1003 0x3EA
°C FLOAT32 3003 0xBBA 1004 0x3EB
6003 0x1772 T °F FLOAT32 3004 0xBBB 1005 0x3EC
°F FLOAT32 3005 0xBBC 1006 0x3ED
6004 0x1773 T °C INT16 3006 0xBBD 4002 0xFA1
6005 0x1774 aw - FLOAT32 3007 0xBBE 1035 0x46E
- FLOAT32 3008 0xBBF 1036 0x46F
6006 0x1775 x ppm FLOAT32 3009 0xBC0 1141 0x474
ppm FLOAT32 3010 0xBC1 1142 0x475
6007 0x1776 Saturation % FLOAT32 3011 0xBC2 1137 0x470
% FLOAT32 3012 0xBC3 1138 0x471
6008 0x1777 aw - INT16 3013 0xBC4 4068 0xFE3
6009 0x1778 x ppm INT16 3014 0xBC5 4071 0xFE6
6010 0x1779 Saturation % INT16 3015 0xBC6 4069 0xFE4
3016 0xBC7 65536 0xFFFF
3017 0xBC8 65536 0xFFFF
3018 0xBC9 65536 0xFFFF
3019 0xBCA 65536 0xFFFF
3020 0xBCB 65536 0xFFFF
Tab. 7 Custom Modbus map example
5.5 Device Status Indication
If a critical error occurs, all Modbus values are set to NaN (according to IEEE754 for data type FLOAT32)
or to 0x8000 (INT16). It is possible to read out all status and error information via Modbus register 602
(0x259). Errors are displayed in bit-coded form. If an event is present, the corresponding bit is set to 1.
Measured values outside the measureing range are limited with the corresponding limit value.
Error Bits Description Recommended action
Bit 0 Error: Hardware T-sensing Return the faulty unit to E+E for service
Bit 1 Error: Short circuit of T sensing element 1. Clean sensing head acc. to cleaning instructions
2. Return the faulty unit to E+E for service
Bit 2 Error: Open loop of T sensing element Return the faulty unit to E+E for service
Bit 3 Error: Short circuit of moisture sensing element 1. Clean sensing head acc. to cleaning instructions
2. Return the faulty unit to E+E for service
Bit 4 Error: Open loop of moisture sensing element
or heavy pollution
1. Clean sensing head acc. to cleaning instructions
2. Return the faulty unit to E+E for service
Bit 5 Warning: Polluted moisture sensing element or
highly conductive oil Clean sensing head or oil is incompatible
Bit 6 Warning: Temperature below allowed working range Observe the lower working range limit
Bit 7 Warning: Temperature above allowed working range Observe the upper working range limit
Bit 8 Error: T sensing element defective Return the faulty unit to E+E for service
Bit 9 Warning: Moisture below allowed working range Observe the lower working range limit
Bit 10 Warning: Moisture above allowed working range Observe the upper working range limit
Bit 11 Error: Moisture sensing element defective Return the faulty unit to E+E for service
Bit 12 Error: Hardware moisture sensing Return the faulty unit to E+E for service

15
User Manual MOP301 Digital Moisture in Oil Immersion Probe
5.6 Modbus RTU Examples
The MOP301’s Modbus address is 70 [0x46].
Please refer to
■ MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b3, chapter 6:
www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf
■ E+E Application Note Modbus AN0103 (available at www.epluse.com/mop301)
Read the temperature (FLOAT32) T = 26.66048812866211 °C from register address 0x3EA:
Master (e.g. PLC) MOP301
Request [Hex]:
Modbus
address
Function
code
Starting
address Hi
Starting
address Lo
Qty. of
registers Hi
Qty. of
registers Lo CRC
46 03 03 EA 00 02 EA CC
Response [Hex]:
Modbus
address
Function
code
Byte
count
Register 1
value Hi
Register 1
value Lo
Register 2
value Hi
Register 2
value Lo CRC
46 03 04 48 AE 41 D5 4A B9
Floating point values are decoded according to IEEE754, refer to the example at the end of this chapter.
Read register from custom modbus map
address 0x0BB8-0x0BB9, unconfigured
Request [Hex]:
Modbus
address
Function
code
Starting
address Hi
Starting
address Lo
Qty. of
registers Hi
Qty. of
registers Lo CRC
46 03 0B B8 00 02 49 7D
Response [Hex]:
Modbus
address
Function
code
Byte
count
Register 1
value Hi
Register 1
value Lo
Register 2
value Hi
Register 2
value Lo CRC
46 03 04 FF FF FF FF CC A3
Mapping custom Modbus map
assign T (register address 0xEA) and aw (register address 0x46E) to the custom Modbus map, starting
address 0xBB8
Request [Hex]:
Modbus
address
Function
code
Starting
address Hi
Starting
address Lo
Qty. of
registers Hi
Qty. of
registers Lo
Byte
count
46 10 17 70 00 02 04
Register 1
value Hi
Register 1
value Lo
Register 2
value Hi
Register 2
value Lo CRC
03 EA 04 6E F2 52
T [°C] aw
Response [Hex]:
Modbus
address
Function
code
Byte
count
Register 1
value Hi
Register 1
value Lo
Register 2
value Hi
Register 2
value Lo CRC
46 10 17 70 00 02 -- 4A D0

16 User Manual MOP301 Digital Moisture in Oil Immersion Probe
Poll register address 0xBB8
Request [Hex]:
Modbus
address
Function
code
Starting
address Hi
Starting
address Lo
Qty. of
registers Hi
Qty. of
registers Lo CRC
46 03 0B B8 00 02 49 7D
Response [Hex]:
Modbus
address
Function
code
Byte
count
Register 1
value Hi
Register 1
value Lo
Register 2
value Hi
Register 2
value Lo CRC
46 03 04 E6 F1 41 DA 1A 47
Poll register address 0xBB8-0xBBE
Request [Hex]:
Modbus
address
Function
code
Starting
address Hi
Starting
address Lo
Qty. of
registers Hi
Qty. of
registers Lo CRC
46 03 0B B8 00 06 48 BE
Response [Hex]:
Modbus
address
Function
code
Byte
count
Register 1
value Hi
Register 1
value Lo
Register 2
value Hi
Register 2
value Lo
Register 3
value Hi
46 03 0C 0B C9 41 DB BD
Register 3
value Lo
Register 4
value Hi
Register 4
value Lo
Register 5
value HI
Register 5
value Lo
Register 6
value Hi
Register 6
value Lo CRC
7B 3E AD FF FF FF FF B7 9A
Decoding of floating point values:
Floating point values are stored according IEEE754. The byte pairs 1, 2 and 3, 4 are reorganised as
follows:
MMMMMMMM MMMMMMMM SEEEEEEE EMMMMMMM
Byte 3 Byte 4 Byte 1 Byte 2
Example (numbers taken from T reading in first Modbus request/response example in this chapter):
Response [Hex]
Byte 1 (Register 2 - Hi) Byte 2 (Register 2 - Lo) Byte 3 (Register 1 - Hi) Byte 4 (Register 1 - Lo)
41 D5 48 AE
0100 0001 1101 0101 0100 1000 1010 1110
SEEE EEEE EMMM MMMM MMMM MMMM MMMM MMMM
Decimal value: 26.66048812866211

17
User Manual MOP301 Digital Moisture in Oil Immersion Probe
6 Maintenance and Service
MOP301 does not require any special maintenance, nevertheless for high accurate measurements
especially over wide aw and T ranges it is recommended to calibrate the probe every 12 months. If
needed, the enclosure may be cleaned and the device may be re-adjusted as described below.
6.1 Cleaning
If required, the sensing head can be cleaned. Please find the E+E cleaning instructions at www.epluse.
com/cleaning-instructions.
6.2 Repairs
Repairs may be carried out by the manufacturer only. The attempt of unauthorized repair excludes any
warranty claims.
6.3 Moisture and Temperature Adjustment and Calibration
Depending on the application and the requirements of certain industries, there might arise the need
for periodical calibration (comparison with a reference) or adjustment (bringing the device in line with a
reference).
The MOP301 can be calibrated / adjusted with the help of the PCS10. For this purpose, the probe needs to
be connected to a PC via a Modbus configuration adapter.
Definitions
■ Calibration documents the accuracy of a measurement device. The device under test (specimen) is
compared with the reference and the deviations are documented in a calibration certificate. During the
calibration, the specimen is not changed or improved in any way.
■ Adjustment improves the measurement accuracy of a device. The specimen is compared with the
reference and brought in line with it. An adjustment can be followed by a calibration which documents
the accuracy of the adjusted specimen.
Calibration and adjustment at E+E Elektronik
Calibration and/or adjustment can be performed in the E+E Elektronik calibration laboratory. For
information on the E+E capabilities in ISO or accredited calibration please see www.eplusecal.com.
Calibration and adjustment by the user
Moisture calibration and adjustment is to be carried out for the measurand “relative humidity” and shall be
performed in air.
Depending on the level of accuracy required, the humidity reference can be:
■ Humidity calibrator (e.g. Humor 20), please see www.epluse.com/humor20.
■ Handheld device (e.g. Oilport 30), please see www.epluse.com/oilport30.
■ Humidity standards (e.g. Humidity Calibration Kit), please see www.epluse.com/mop301.
6.4 Spare Parts
Description Order code
Stainless steel filter cap for flow < 1 m/s HA010110
Stainless steel filter cap for flow > 1 m/s HA010111

18 User Manual MOP301 Digital Moisture in Oil Immersion Probe
7 Accessories
Item Order code
E+E Product Configuration Software (Free download: www.epluse.com/pcs10)PCS10
Modbus configuration adapter HA011018
Stainless steel filter cap for flow < 1 m/s HA010110
Stainless steel filter cap for flow > 1 m/s HA010111
Protection cap for M12 socket HA010781
Protection cap for M12 plug HA010782
T wcoupler M12 - M12 HA030204
Ball valve G 1/2" ISO HA050101
Ball valve 1/2" NPT HA050104
Sampling cell with shut-off function, PN40, DN25 HA050109

19
User Manual MOP301 Digital Moisture in Oil Immersion Probe
8 Technical Data
Measurands
Water activity (aw) / Water content (x)
Measuring range 0...1 aw
0...100 000 ppm; actual range depends on the oil type, for non-
mineral transformer oil, specific solubility parameters are needed
(ppm output is valid in the range 0...100 °C (32...212 °F))
Response time t90, typ. 10 min. in still oil
@ 20 °C (68 °F)
Accuracy1)
Including hysteresis, non-linearity and repeatability
0...40 °C (32...104 °F) (0...0.9 aw) ±0.02 aw
(0.9...1 aw) ±0.025 aw
-40...120 °C (-40...356 °F) (0...1 aw) ±0.03 aw
Resolution 0.0001 aw
Temperature (T)
Measuring range -40...120 °C (-40...248 °F)
Accuracy1)
Resolution 0.01 °C
Output
Digital interface RS485 (MOP301 = 1 unit load)
Protocol Modbus RTU
Factory settings 9 600 Baud, parity even, 1 stop bit, Modbus address 70
Supported baud rates 9 600, 19 200, 38 400, 57 600, 76 800 and 115 200
Data types for measured values FLOAT32 and INT16 registers
General
Power supply class III (EU) / class 2 (NA) 8 - 35 V DC2)
Power consumption, typ. 40 mW (without termination resistor)
Electrical connection
M12x1, 4 poles
Protection rating IP66 / NEMA 4X
Pressure rating 20 bar (290 psi)
Probe material Stainless steel 1.4404
Cable jacket3) HFS 125XL, black, oil and fuel resistant
Temperature working range Sensing element + filter cap: -40...125 °C (-40...257 °F)
Probe: -40...120 °C (-40...248 °F)
Cable: -40...120 °C (-40...248 °F)
M12 connector: -25...90 °C (-13...194 °F)
Storage conditions -40...80 °C (-40...176 °F)
0...95 %RH, non-condensing
Electromagnetic compatibility EN 61326-1 EN 61326-2-3 ICES-003 ClassA
Industrial Environment FCC Part15 ClassA
Shock and vibration Tested acc. to EN 60068-2-6 and EN 60068-2-27
Configuration and adjustment PCS10 Product Configuration Software (free download) and
configuration adapter
1) Valid in fluids.
Traceable to international standards, administrated by NIST, PTB, BEV...
The accuracy statement includes the uncertainty of the factory calibration with an enhancement factor k=2 (2-times standard deviation). The accuracy
was calculated in accordance with EA-4/02 and with regard to GUM (Guide to the Expression of Uncertainty in Measurement).
2) USA & Canada class 2 supply required, max. supply voltage 30 V DC.
3) Please mind the mounting and installing instructions included in the user manual.
-40 -20 0 20 40 60 80 100 120 140 160 180
0
0.1
0.2
0.3
0.4
0.5
0.6
∆T [°C]
T [°C]
40 20 040
20 80
60 120 100
0.15
0.45
0.1
0.2
0.3
0.4
0.5
0
∆T [°C]
T [°C]
∆T [°C]
T [°C]

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