APG MNU IS Series User manual

APG
R
Doc # 9005166
Part #200177
Rev. A, 09/2018
MNU IS Ultrasonic Modbus Sensors
User Manual
Intrinsically Safe Ultrasonic Modbus Sensor

ii Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
Table of Contents
Introduction ................................................................................................................ iii
Warranty and Warranty Restrictions.................................................................... iv
Chapter 1: Specications and Options..................................................................... 1
Dimensions ........................................................................................................................................1
Specications ................................................................................................................................... 2
Model Number Congurator.......................................................................................................... 3
Electrical Pinout Table, Power Supply Table, and System Wiring Diagrams................. 4-6
Chapter 2: Installation and Removal Procedures and Notes..............................7
Tools Needed..................................................................................................................................... 7
Installation Notes ............................................................................................................................ 7
Physical Installation Notes ........................................................................................................... 7
Electrical Installation ..................................................................................................................... 8
Mounting Instructions ................................................................................................................... 8
Software Installation....................................................................................................................... 8
Removal Instructions ..................................................................................................................... 8
Chapter 3: Programming ............................................................................................9
Modbus Programming .................................................................................................................... 9
Modbus Programming via Internet with RST-5003 or LOE .................................................... 9
Modbus Programming with APG Modbus Software .............................................................. 10
MNU IS Modbus Register Lists.............................................................................................. 10-11
MNU IS Modbus Sensor Parameters ....................................................................................12-16
MNU IS Web / Independant Modbus Alarm Parameters ................................................. 17-19
MNU IS Modbus Application Parameters .......................................................................... 19-24
Chapter 4: QuickMode Operation and Notes........................................................25
QuickMode Description................................................................................................................ 25
QuickMode Operation ................................................................................................................... 25
QuickMode Operation Notes ....................................................................................................... 25
QuickMode Communication Notes............................................................................................26
QuickMode Settings......................................................................................................................26
Using QuickMode .......................................................................................................................... 27
QuickMode Timing Example.......................................................................................................28
Chapter 5: Maintenance ...........................................................................................29
General Care....................................................................................................................................29
Calibration .......................................................................................................................................29
Troubleshooting.............................................................................................................................30
Repair and Returns........................................................................................................................30

iii
Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
Introduction
Thank you for purchasing a Series MNU IS Intrinsically Safe Modbus Ultrasonic Sensor from APG. We
appreciate your business! Please take a few minutes to familiarize yourself with your MNU IS and this
manual.
MNU IS ultrasonic sensors are rugged, low-power units, rated Intrinsically Safe for hazardous location
installations. They feature APG’s new QuickStart Mode for power-saving, on-demand measurements and
optional Gas Discharge Tube surge protection. All MNU IS sensors are fully programmable via RS-485
Modbus communications, and with APG Modbus software and an RS-485-to-USB converter.
Reading your label
Every APG instrument comes with a label that includes the instrument’s model number, part number, serial
number, and a wiring pinout table. Please ensure that the part number and pinout table on your label
match your order.
IMPORTANT: Your MNU IS sensor MUST be installed according to drawing 9005002
(Hazardous Installation Drawing) located at the back of the manual to meet listed approv-
als. Faulty installation will invalidate all safety approvals and ratings.
Certications
Class I Division 1, Groups C& D, T4
Class I, Zone 0, AEx ia IIB T4 Ga
Ex ia IIB T4 Ga
IECEx SIR 18.0048X
Ex ia IIB T4 Ga
0344 Ta: -30°C to 60°C
SIR 18ATEX2193X
II 1G Ex ia IIB T4 Ga
Ta: -30°C to 60°C
US
C
237484
Table of Contents
Chapter 6: Hazardous Installation Drawing and Certication......................... 31
Hazardous Installation Drawing................................................................................................. 31
CSA Certicate of Compliance.............................................................................................. 32-35
EC Declaration of Conformity .....................................................................................................36
IECEX Certicate of Conformity........................................................................................... 37-39
Appendix..................................................................................................................... 40
Appendix A: MNU IS Default Holding Register Values .........................................................40
Appendix B: MNU IS Barrier Notes............................................................................................ 41

iv Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
Warranty and Warranty Restrictions
This product is covered by APG’s warranty to be free from defects in material and workmanship under
normal use and service of the product for 24 months. For a full explanation of our Warranty, please visit
https://www.apgsensors.com/about-us/terms-conditions. Contact Technical Support to receive a Return
Material Authorization before shipping your product back.
Scan the QR code below to read the full explanation of our Warranty on your tablet or smartphone.

1
Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
Chapter 1: Specications and Options
• Dimensions
MNU-IS-2424 MNU-IS-2425
MNU-IS-6424 MNU-IS-6425
3/4” ø NPT
Threads
2” ø NPT
Threads
1.98”
50.29mm
1.47”
37.34mm
5.08”
129.03mm
3.05”
77.47mm
7.21”
183.13mm
Housing Option 2

2Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
Performance
Operating Range / Transducer Frequency
Option 2 - 69 KHz (-20 - 50°C) 1.0 - 25.0 ft. / 12 in. - 300 in. / 305mm - 7620mm
Option 6 - 69 KHz (-30 - 60°C) 1.0 - 25.0 ft. / 12 in. - 300 in. / 305mm - 7620mm
Digital Output Modbus, via RS-485
 BeamPattern 9°oaxis
Sample Rate 1 - 20 Hz
Response Time Programmable
Accuracy
Accuracy Greater of ±0.25% of detected range or ± 3mm
Resolution 0.1 inch (2.54 mm)
Environmental
Operating & Storage Temperature Ambient -30 to 60°C (-22 to 140°F)
        unlessotherwisespecied
Internal Temperature Compensation Yes
Humidity 100% non-condensing
IP rating IP68, submerged 3 meters for 48 hours
Electrical
Supply Voltage (at sensor) 8-24 VDC
Opperating Current Draw (dependent on setup)
@ 8 VDC: Min = 30 mA, Max = 75 mA rms
@ 24 VDC: Min = 15 mA, Max = 30 mA rms
Waiting Status Current Draw
@ 8 VDC: 17 mA rms
@ 24 VDC: 13 mA rms
Connection 2 Shielded Twisted Pair and drain wire
Materials of Construction
Transducer Face
Housing Option 2 Kynar PVDF
Housing PBT/Polycarbonate blend
Mounting
Housing Option 2 2” NPT (Housing body), 3/4” NPT (Lid)
IS Entity Parameters
See Hazard Drawing 9005002 at back of manual for IS Entity Parameter listing.
• Specications

3
Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
• Model Number Congurator
Model Number: MNU - IS - _____ _____ _____ _____ - _____ _____ _____
A B C D E F G
A. Range, Frequency
□2 1 - 25 ft. (305 - 7620 mm); 69 kHz Transducer†
□6▲1 - 25 ft. (305 - 7620 mm); 69 kHz Transducer
B. Lid Interface Threads
□4▲3/4 in. MNPT
C. Housing
□2▲2 in. MNPT, Valox PBT
D. Output
□4▲RS-485 Modbus RTU, Intrinsically Safe
□5 RS-485 Modbus RTU, Intrinsically Safe w/ Gas Discharge
Tube Surge Protection
†Range Option 2 (1 - 25 ft. / 69 kHz Transducer) has alter-
nate temperature range of -20° - 50°C.
E. Cable
□C▲Shielded Cable with Flying Leads
F. Electrical Cable Length
□___ Specify Length (6 ft. standard length + 5 ft.
increments)
G. Seal
□A▲Cable Gland with Spiral Strain Relief
□B Cable Gland
□C Cable Gland (Atex)
Note: ▲Indicates this option is standard.

4Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
• Electrical Pinout Table, Supply Power Table, and System Wiring Diagrams
Pigtail
(2 Twisted Pairs)
Modbus
Red 8 - 24 VDC
Black DC Ground
Green B (TX-)
White A (TX+)
Shield Drain Earth Gnd at IS
Barrier or Supply
Modbus
Power Supply 8-24 VDC
MNU Series Pinout Table MNU Series Supply Power Table
IMPORTANT: Some manufacturer’s Modbus equipment uses reversed TX+/TX- pins.
When making connections to any Modbus equipment, reversing connections may be neces-
sary if sensor does not communicate with controller.

5
Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
Modbus System Wiring with RST-6001
Modbus System Wiring
IMPORTANT: Your MNU IS sensor MUST be installed according to drawing 9005002
(Hazardous Installation Drawing) located at the back of the manual to meet listed approv-
als. Faulty installation will invalidate all safety approvals and ratings.
Power
Supply
+8-24 Vdc
GND Use Shielded Cable
120 Ω terminating resistor
may be necessary for long
cable runs.
V+
B (TX-)
A (TX+)
Sensor 1
GND
V+
B (TX-)
A (TX+)
Sensor 2
GND
V+
B (TX-)
A (TX+)
Sensor 3
GND
Master
Device
RS-485 A (TX+)
RS-485 B (TX-)
MNU IS Sensor MNU IS Sensor MNU IS Sensor
Note: When connecting MNU IS
sensors to your system, reversing
A and B connections may be necessary
if sensors do not communicate with
Modbus Master device.
120 Ω terminating resistor across A & B
terminals of last or only sensor, if necessary.
For installations without IS barriers only.
Wiring T’s must be located on
controller/supply side of IS barriers.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
Power
Supply
+8-24 Vdc
GND Use Shielded Cable
Equivalent 120 Ω
terminating resistor
internal to RST-6001
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
MNU IS sensor
+5V
MNU IS sensor MNU IS sensor
Note: An independent +8-24 Vdc
power supply is required when using
an RST-6001 Modbus Controller. The
RST-6001 can only supply ±5 Vdc, not
the +8-24 Vdc required by the MNU IS.
Wiring T’s must be located on
controller/supply side of IS barriers.
120 Ω terminating resistor across A & B
terminals of last or only sensor, if necessary.
For installations without IS barriers only.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.

6Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
Modbus System Wiring with RST-5003 and Independent Power Supply
Modbus System Wiring with RST-5003 and POE or VDC Daisy Chain
IMPORTANT: Your MNU IS sensor MUST be installed according to drawing 9005002
(Hazardous Installation Drawing) located at the back of the manual to meet listed approv-
als. Faulty installation will invalidate all safety approvals and ratings.
Modbus
Connection
Use Shielded Cable
Equivalent 270 Ω
terminating resistor
internal to RST-5003
270 Ω terminating resistor across A & B
terminals of last or only sensor, if necessary.
For installations without IS barriers only.
Connection to
network/Internet
RST-5003
Modbus
Controller
V+ / GND
A & B
Sensor 1
V+ / GND
A & B
Sensor 2
V+ / GND
A & B
Sensor 3
MNU IS sensor MNU IS sensor MNU IS sensor
Power Supply
+8-24 VDC / GND
Power to RST-5003 can be supplied via 12-24 VDC
or POE. If not using POE, use a single power supply
to both the RST-5003 and the MNU ISs.
Wiring T’s must be located on
controller/supply side of IS barriers.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
Modbus
Connection
Use Shielded Cable
Equivalent 270 Ω
terminating resistor
internal to RST-5003
Connection to
network/Internet
RST-5003
Modbus
Controller
V+ / GND
A & B
Sensor 1
V+ / GND
A & B
Sensor 2
V+ / GND
A & B
Sensor 3
MNU IS sensor MNU IS sensor MNU IS sensor
+VDC
GND
Power must be supplied to RST-5003 via POE
(Power Over Ethernet) or 24VDC daisy-chain at
+VDC / GND terminals
270 Ω terminating resistor across A & B
terminals of last or only sensor, if necessary.
For installations without IS barriers only.
Wiring T’s must be located on
controller/supply side of IS barriers.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.

7
Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
Chapter 2: Installation and Removal Procedures and Notes
• Installation Notes
• Mount your MNU IS sensor so that it has a clear, perpendicular sound path to the surface being moni-
tored. Your sensor should be mounted away from tank or vessel walls and inlets. (See Figure 2.1)
• Thesoundpathshouldbefreefromobstructionsandasopenaspossibleforthe9°oaxisbeam
pattern.
• If you are using a stand pipe, please see our guide to stand pipes on our website:
http://www.apgsensors.com/about-us/blog/how-to-install-a-stand-pipe.
• Typical tools for making electrical connections and mounting the sensor are required. If you are using a
stand pipe to mount your MNU IS, you may also need tools to install the stand pipe.
• Tools Needed
Figure 2.1
The MNU IS should be installed in an area--indoors or outdoors--which meets the following conditions:
• Ambienttemperaturebetween-30°Cand60°C(-22°Fto140°F),unlessotherwisespecied.
• No chemicals corrosive to PVDF or PBT.
• Ample space for maintenance and inspection.
• Thesensorislocatedawayfromstrongelectromagneticelds,suchasthoseproducedbymotors,
transformers, solenoid valves, etc.
• The sensor is not exposed to excessive vibration.
• Thesensorisshieldedfromdirectsunlightorfromtemperaturesdierentthanthetemperaturesbe-
tween the sensor and the target. This is required for temperature compensation to work correctly.
• The equipment shall be installed in a location where the external conditions are not conducive to the
build-up of electrostatic charge on the sensor. The equipment shall only be cleaned with a damp cloth.
• Physical Installation Notes

8Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
• Attach the wires of your MNU IS to your control system according to the pinout table on page 4.
• Electrical Installation
NOTE: Do not mount the sensor where the beam will intersect objects such as ll
streams, pipes, ladder rungs, wall seams, or corrugated tank walls.
• Mounting Instructions
Mounting your MNU IS is easy if you follow a few simple steps:
• Never over-tighten the sensor.
• Always screw in your sensor by hand to avoid cross-threading. Thread failure can be a problem if you
damage threads by over-tightening them or by crossing threads.
IMPORTANT: Do not over tighten! The sensor should be threaded in only hand tight.
• Ensurethatpowertothesensoriso.
• Disconnect cable to sensor.
• Remove the sensor and store it in a dry place, at a temperature between -30°C and 60°C (-22°F to
140°F),unlessotherwisespecied.
• If the sensor was installed in a hazardous location, ensure that the cable will not energize while the
sensor is disconnected.
• Removal Instructions
• DownloadtheAPGModbussoftwareziplefromhttp://apgsensors.com/support.
• Opentheziple.
• Choose“Install”fromtheoptionsatthetopoftheziplewindow.
• The installation process will prompt you as needed to complete the installation.
• The software will create APG_Modbus.exe which will run from a folder in your start menu titled “APG/
APG_Modbus”.
• Software Installation
DANGER: Do not disconnect equipment installed in hazardous locations unless power
has been switched o or area is known to be non-hazardous.
IMPORTANT: Some manufacturer’s Modbus equipment uses reversed TX+/TX- pins.
When making connections to any Modbus equipment, reversing connections may be nec-
essary if sensor does not communicate with controller.

9
Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
MNU IS series sensors use standard Modbus RTU protocol (RS-485). The sensors can only operate as slave
devices. Sensor default transmission settings are 9600 Baud, 8 Bits, 1 Stop Bit, No Parity, and require a
minimum delay of 200-300 ms between transactions to return the contents of all registers. Commands re-
turning fewer registers will require shorter delays. See MNU IS Modbus Register Lists on pages 10 - 11.
Chapter 3: Programming
• Modbus Programming
NOTE: For more information about Modbus RTU, please visit www.modbus.org.
MNU IS Modbus series sensors can be programmed, controlled, and monitored via the Internet (or local
Ethernet) using an RST-5003 web-enabled Modbus master controller or LOE web-enabled Modbus master
sensor. One RST-5003 or LOE can control and monitor up to 10 APG Modbus-equipped sensors. Please refer
to the RST-5003 User Manual or LOE User Manual for further instructions and help setting up and operating
an RST-5003 or LOE and using either one to program and control MNU IS sensors.
• Modbus Programming via Internet with RST-5003 or LOE
NOTE: For the RST-5003 User Manual or LOE User Manual, please visit http://apgsen-
sors.com/support.

10 Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
APG Modbus software can be used in tandem with an APG RST-6001 Modbus Controller to program and
control up to 20 MNU IS sensors. Through the APG Modbus software, you can monitor the raw readings
fromthesensor,orcongurethesensor.SeeMNUISModbusRegisterListsbelow.
• Modbus Programming with APG Modbus Software
NOTE: For APG Modbus programming instructions, or to download APG Modbus soft-
ware, please visit www.apgsensors.com/support.
• MNU IS Modbus Register Lists
Input Registers (0x04)
Register Returned Data
30299 Model Type
30300 Raw Distance/Level Reading (in mm, unsigned)
30301 N/A
30302 Temperature Reading (in 0C, signed)
30303-30304 Calculated (raw)
30305-30306 N/A
30307 (upper byte) Version
30307 (lower byte) Signal Strength
30308 N/A
30309 (upper byte) Trip 1 Alarm
30309 (lower byte) Trip 1 Status
30310 (upper byte) Trip 2 Alarm
30310 (lower byte) Trip 2 Status
30314-30318 10 Byte Sensor Serial Number
30500-30598 Quickmode Samples
NOTE: The Calculated Readings will be returned without a decimal place. In order to
obtain the true result, the Decimal Place setting must be taken into account.

11
Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
Holding Registers (0x03) - MNU IS
Register Function Value Range
40400 Device Address 1 to 247
40401 Units 1 = Feet, 2 = Inches, 3 = Meters
40402 Application Type 0 - 11
40403 Volume Units 1 - 7
40404 Decimal (Calculated) 0 - 3
40405 Max Distance 0 - 15,250 mm
40406 Full Distance 0 - 15,250 mm
40407 Empty Distance 0 - 15,250 mm
40408 Sensitivity 0 - 100
40409 Pulses 0 - 20
40410 Blanking 0 - 15,250 mm
40411 Gain Control 0 - 5
40412 Averaging 1 - 100
40413 Filter Window 0 - 15,250 mm
40414 Out of Range 1 - 255
40415 Sample Rate 50 - 1000 milliseconds
40416 Multiplier 1 - 1999 (1,000 = 1.000)
40417   Oset     -15,250-15,250mm
40418 N/A
40419 N/A
40420 Temperature Compensation 0 = No, 1 = Yes
40421 QuickMode Enable 0 - 98
40422 QuickMode Delay 0 - 65535 ms
40423 Pulse Power 10 - 100%
40424-40425 N/A
40426 4 mA Set Point *N/A
40427 20 mA Set Point *N/A
40428 4 mA Calibration *N/A
40429 20 mA Calibration *N/A
40430 Trip 1 Value 0 - 15,250 (mm)
40431 Trip 1 Window 0 - 15,250 (mm)
40432 Trip 1 Type 0 - 29
40433 Trip 2 Value 0 - 15,250 (mm)
40434 Trip 2 Window 0 - 15,250 (mm)
40435 Trip 2 Type 0 - 29
40436-40437 Parameter 1 0 - 1,000,000 (mm)
40438-40439 Parameter 2 0 - 1,000,000 (mm)
40440-40441 Parameter 3 0 - 1,000,000 (mm)
40442-40443 Parameter 4 0 - 1,000,000 (mm)
40444-40445 Parameter 5 0 - 1,000,000 (mm)
40187 QuickMode Resample Non-Zero Number
40201 Reset to Factory Defaults 1
*These registers are not used by the MNU IS, even though they are labeled in the APG Modbus software.

12 Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
• MNU IS Modbus Sensor Parameters
40401 - Units
Determines the units of measure for the calculated reading when Application Type is set to 0, 1, or 7.
1 = Feet 2 = Inches 3 = Meters
40402 - Application Type
Determines the type of calculated reading performed by the sensor.
0 = Distance
1 = Depth of Level
2 = Volume of Standing Cylindrical Tank with or without Hemispherical Bottom
3 = Volume of Standing Cylindrical Tank with or without Conical Bottom
4 = Volume of Standing Rectangular Tank with or without Chute Bottom
5 = Volume of Horizontal Cylindrical Tank with or without Spherical Ends
6 = Volume of Spherical Tank
7 = Pounds (Linear Scaling)
8 = N/A
9 = Volume of Vertical Oval Tank
10 = Volume of Horizontal Oval Tank
11 = Curve Fit (Strapping Chart)
SeeMNUISApplicationParametersonpages19-24forparametercongurationsforeachapplication.
40403 - Volume Units
Determines the units of measure for the calculated reading when Application Type is set to 2 - 6 or 9 -11.
1 = Feet35 = Liters
2 = Million Feet36 = Inches3
3 = Gallons 7 = Barrels
4 = Meters3
40404 - Decimal Place
Determines the number of decimal places included in the Calculated Reading. The Calculated Reading will
always be returned as a whole number.
For example, a Calculated Reading of 1126.658 (gallons, ft3, etc.) will be returned as follows:
Decimal Place = 0 Volume = 1127 (rounded to nearest whole number)
Decimal Place = 1 Volume = 11267 (divide by 10 to get true result)
Decimal Place = 2 Volume = 112666 (divide by 100 to get true result)
Decimal Place = 3 Volume = 1126658 (divide by 1000 to get true result)

13
Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
40405 - Maximum Distance
Sets the distance (beginning from the Zero Point) to the point where the sensor will stop looking for target
signals. Targets detected beyond the Maximum Distance value will be ignored by the sensor. Maximum Dis-
tance+Oset(HoldingRegister40417)cannotexceedthesensor’smaximumoperatingrange(seeOperat-
ingRange/TransducerFrequencyinSpecications,page2).
40406 - Full Distance
Sets the distance (beginning from the Zero Point) to the point where the monitored vessel is considered full.
40407 - Empty Distance
Sets the distance (beginning from the Zero Point) to the point where the monitored vessel is considered
empty.
40408 - Sensitivity
Sets the level of gain that is applied to the echo (0-100%). When operating in AutoSense, Hard-Target, or
Soft-Target(seeGainControl,HoldingRegister40411),Sensitivitysetsanupperlimitfortheamplication
that can be applied to the echo. If operating in Manual, this parameter sets the gain.
When using Manual Gain Control, set Sensitivity to the minimum value that will allow the target to be
reliably tracked through the full range of expected environmental conditions (i.e., apply only as much
amplicationasnecessary).Thisreducespowerusageandextendstransducerlife.
40409 - Pulses
Sets the number of ultrasonic pulses per transmission burst (0-20). The more pulses that are sent in a burst,
the stronger the returning echo. For Gain Control (Holding Register 40411) settings Auto Sense, Hard Target,
and Soft Target, this setting limits the maximum number of pulses used by the sensor.
When Gain Control is set to Manual, increase the strength of the transmission by increasing Pulses or Pulse
Power (Holding Register 40423) for detecting soft targets in damping environments. In acoustically active
environments or small enclosed areas, decrease Pulses or Pulse Power to reduce multiple echoes.
NOTE: When Gain Control is set to Auto-Sense, Hard-Target, or Soft-Target, set Sensi-
tivity (40408) and Pulses (40409) to maximum values, as these are the upper limits used
by the sensor.

14 Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
40410 - Blanking
Sets the blanking distance, which is the zone from the Zero Point of the sensor to the point from which
therstechowillbeaccepted.Whileblankingdistancecanbeusedtoignoreunwantedtargets--suchas
welds,seams,pipettings,orgaskets--betweenthesensorandtheclosestacceptabletargetlevel,such
objectsgenerallycreateadditionalreectionsandechoes,whicharehardtolterout.Moreoften,blanking
distance is used for a sensor installed in a stand pipe.
40411 - Gain Control
Selects the control mode for the sensor’s gain settings (Sensitivity and Pulses, Holding Registers 40408 and
40409). In AutoSense, the sensor automatically adjusts Sensitivity and Pulses for the best quality return
signal. Manual, Hard Target, and Soft Target are user controlled scenarios. In Manual, the user is in full
control of Sensitivity and Pulses. For Hard and Soft Target, the user sets maximum Sensitivity and Pulses,
but the overall gain is either ramped up slowly (Hard Target) or quickly (Soft Target) by the sensor until an
optimal return signal is achieved.
0 = Manual
1 = AutoSense
2 = Hard-Target
3 = Soft-Target
4 = AutoSense Soft-Target
5 = AutoSense Hard-Target
40412 - Averaging
Setsthenumberofqualiedreceivedsignals(0-100)toaverageforthedisplayedreading.Qualiedreceived
signalsareplacedinarst-in,rst-outbuer,thecontentsofwhichareaveragedforthedisplayedoutput.
Thelargerthenumberofqualiedreceivedsignalsbeingaveraged,thesmoothertheoutputreadingwillbe,
and the slower the reading will be to react to quickly changing targets.
40413 - Filter Window
Determinesthephysicalrange(0-15,250mm)ofqualiedreceivedsignals,basedonthecurrentreading.
Signals beyond the +/- Filter Window range of the current reading will not qualify unless the average moves.
SignalsoutsidetheextentsoftheFilterWindowarewrittentotheOutofRangesamplesbuer(Holding
Register 40414).
NOTE: Increases in Pulses (40409) may require increased Blanking (40410).
NOTE: When Gain Control is set to Auto-Sense, Hard-Target, or Soft-Target, Sensitivity
(40408) and Pulses (40409) settings are the maximum possible values used by the sen-
sor.

15
Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
40415 - Sample Rate
Sets the time delay between samples taken by the sensor (50 - 1000 ms). While shorter time delays allow for
quicker sensor response times to changing levels, longer sample rate delays reduce the likelihood of echo-
based false positives. Also, longer sample rates result in longer sensor life.
40416 - Multiplier
Calibrates the sensor for changes in the speed of sound due to variations in atmospheres. The Multiplier
is shown by the values 1 - 1999, but these values are understood to represent 0.001 - 1.999. The default of
1,000 (i.e., 1.000) is used for most applications. See the Calibration section of Chapter 4.
40417 - Oset
Sets the Zero Point of the sensor, the point from which the calculated distance is measured. When the
Osetissetto0,theZeroPointofthesensorisatthefaceofthetransducer(SeeFigure3.1).Apositive
settingwillmovetheZeroPointforward,infrontofthesensorface(SeeFigure3.2).SettingtheOsettoa
negative number will move the Zero Point backward, behind the sensor face (See Figure 3.3).
Inallcases,Blanking(HoldingRegister40410)ismeasuredfromtheendofOset,andtheeective
measurementzoneofthesensorbeginsattheforwardendofBlanking.IfOsetismorenegativethan
Blankingispositive,thenetdierencewillbealossinsensormaximumrange(SeeFigure3.3).
Zero
Point
Sensor
Max.
Distance
Blanking
Effective
Measurement Zone
Offset = 0
Zero
Point
Sensor
Max.
Distance
Blanking
Effective
Measurement Zone
Offset > 0
Offset
Zero
Point
Sensor
Max.
Distance
Blanking
Effective
Measurement Zone
Offset < 0
Offset
Sensor
Max. minus
Offset
Figure 3.1 Figure 3.2 Figure 3.3
40420 - Temperature Compensation
ActivatesordeactivatestheMNUIS’sinternaltemperaturecompensationcircuit(1=On,0=O).The
speedofsoundchangeswithchangesintemperature,thereforechangesintemperatureaectdistance
measurements.Theseeectscanbeminimizedbyactivatingtemperaturecompensation.
40414 - Out of Range
Sets the number of consecutive samples outside the Filter Window (Holding Register 40413) necessary to
automatically adjust the current reading and move the Filter Window.

16 Tel: [phone] • Fax: [phone] • www.apgsensors.com • [email protected]
40421 - QuickMode
Sets the number of samples to average for quick distance reading on power up or QuickMode Resample (0 =
O,1-99=numberofsamplestoaverage).UnaveragedsamplescanbereadfromRegister30500-30598.
See QuickMode Operation and Notes on page 25-27.
40422 - QuickMode Delay
Speciesthelengthofdelay,innumberofmilliseconds,beforethesensorbeginstakingQuickMode
samples. This delay includes the time needed to power up the sensor. Power up takes 250 ms, so a
QuickMode Delay setting of 250 will result in samples starting immediately after the power up time. To delay
the sensor’s samples 500 ms (half a second) beyond power up, QuickMode Delay should be set to 750.
See QuickMode Operation and Notes on page 25-28.
40423 - Pulse Power
Set the percentage of power (10-100) that will be used for each pulse transmission. The higher the
percentage of pulse power the stronger the returning echo will be.
When Gain Control (Holding Register 40411) is set to Manual, increase the strength of the transmission
by increasing Pulses (Holding Register 40409) or Pulse Power for detecting soft targets in damping
environments. In acoustically active environments or small enclosed areas, decrease Pulses or Pulse Power
to reduce multiple echoes.
NOTE: Pulse Power is independent of Gain Control (Holding Register 40411), and is
not eected by any of its settings.
40187 - QuickMode Resample
Initiates a QuickMode sample from a sensor in waiting status whenever a non-zero value is written to this
register. See QuickMode Operation and Notes on page 25-28.
40201 - Reset to Factory Defaults
Resets all Holding Registers to factory default values when 1 is written to this register.
NOTE: Factory Reset does not overwrite Device Address (Holding Register 40400).