IMP+ i.s.
INSTRUCTION MANUAL
IMP I.S. (FOURTH EDITION REV. 2)
June 2017
Part Number M-081-0-004-2P
COPYRIGHT
© Pulsar Process Measurement Limited, 2006-17. All rights reserved. No part of this publication may
be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in
any form without the written permission of Pulsar Process Measurement Limited.
WARRANTY AND LIABILITY
Pulsar Process Measurement Limited guarantee for a period of 2 years from the date of delivery that it
will either exchange or repair any part of this product returned to Pulsar Process Measurement
Limited if it is found to be defective in material or workmanship, subject to the defect not being due to
unfair wear and tear, misuse, modification or alteration, accident, misapplication or negligence.
DISCLAIMER
Pulsar Process Measurement Limited gives nor implies any process guarantee for this product, and
shall have no liability in respect of any loss, injury or damage whatsoever arising out of the
application or use of any product or circuit described herein.
Every effort has been made to ensure accuracy of this documentation, but Pulsar Process
Measurement Limited cannot be held liable for any errors.
Pulsar Process Measurement Limited operates a policy of constant development and improvement and
reserves the right to amend technical details as necessary.
TECHNICAL ENQUIRIES
Please contact Pulsar Process Measurement Limited for technical support.
COMMENTS AND SUGGESTIONS
If you have any comments or suggestions about this product, then please contact:
Pulsar Process Measurement Limited
Pulsar Process Measurement Inc.
Cardinal Building
Enigma Commercial Centre
Sandy’s Road
Malvern
Worcestershire
WR14 1JJ
United Kingdom
PO Box 5177
Niceville
FL 32578-5177
USA
Tel: + 44 (0) 1684 891371
Fax: + 44 (0) 1684 575985
Tel: + 1 850 279 4882
Fax: + 1 850 279 4886
Web Site: http://www.pulsar-pm.com
e-mail: info@pulsar-pm.com (general
information)
e-mail: support@ pulsar-pm.com (product
support)
Web Site: http://www.pulsar-pm.com
e-mail: info.usa@pulsar-pm.com (general
information)
e-mail: support.usa@ pulsar-pm.com (product
support)
Contents
Chapter 1 Start Here… ......................................................................................................................................... 1
About this Manual ........................................................................................................................................... 1
About the IMP+ i.s. Level Monitoring System ................................................................................................. 2
Functional Description ............................................................................................................................ 2
Product Specification....................................................................................................................................... 4
EU Declaration of Conformity ....................................................................................................................... 5
Chapter 2 Installation............................................................................................................................................ 6
Hazardous Area Installation ............................................................................................................................ 6
Information specific to Hazardous Area Installation.............................................................................. 6
Hazardous Area Specific Power Supply and barrier Requirements.............................................................. 7
Voltage drop due to i.s. safety Zener barrier........................................................................................... 8
Suitable recommended barriers ............................................................................................................... 9
Location and mounting information ............................................................................................................. 11
Preparation for Operation .............................................................................................................................. 15
Maintenance ................................................................................................................................................... 15
Chapter 3 How To Use Your IMP+ i.s. Level Monitoring System ...................................................................... 16
Operating the Controls .................................................................................................................................. 16
Display ................................................................................................................................................... 16
Run Mode .............................................................................................................................................. 16
Program Mode ....................................................................................................................................... 17
Button Functions .................................................................................................................................... 17
How to Access Program Mode ..................................................................................................................... 17
Parameter Defaults ........................................................................................................................................ 19
Factory Defaults ..................................................................................................................................... 19
Chapter 4 Getting Results With Your IMP+ i.s...................................................................................................... 20
Setting up Your Application ......................................................................................................................... 20
Empty Distance...................................................................................................................................... 20
Span ........................................................................................................................................................ 20
Near and Far Blanking .......................................................................................................................... 20
The 4-20 mA Output ..................................................................................................................................... 20
Setting Security Passcodes ............................................................................................................................ 21
Using A Passcode .................................................................................................................................. 21
Changing the Passcode .......................................................................................................................... 22
Resetting Factory Defaults ............................................................................................................................ 22
Checking the Information Specific to your IMP+ i.s. ........................................................................................ 22
Checking the Software Revision and Serial Number .......................................................................... 22
Chapter 5 Parameter Guide ................................................................................................................................ 23
Parameter Listing ........................................................................................................................................... 23
Application (APP) Menu .............................................................................................................................. 23
P100 Mode of Operation ....................................................................................................................... 23
P104 Measurement Units ...................................................................................................................... 23
P105 Empty Level ................................................................................................................................. 23
P106 Span .............................................................................................................................................. 24
P107 Near Blanking Distance ............................................................................................................... 24
P108 Far Blanking Distance ................................................................................................................. 24
Volume (UoL) Menu .................................................................................................................................... 25
P600 Vessel Shape ................................................................................................................................ 25
P601-P603 Vessel Dimensions ............................................................................................................. 27
P604 Calculated Volume....................................................................................................................... 27
P605 Volume Units ............................................................................................................................... 28
P606 Correction Factor ......................................................................................................................... 28
P607 Max Volume ................................................................................................................................ 28
Display (DiSP) Menu .................................................................................................................................... 29
P800 Display Units ................................................................................................................................ 29
P801 Decimal Places ............................................................................................................................. 29
P808 Fail-safe Mode ............................................................................................................................. 29
P809 Fail-safe Time .............................................................................................................................. 29
mA Output (LOOP) Menu ............................................................................................................................ 30
P834 mA Low Level ............................................................................................................................. 30
P835 mA High Level ............................................................................................................................ 30
P838 mA Low Trim .............................................................................................................................. 30
P839 mA High Trim .............................................................................................................................. 30
P840 mA Fail-safe Mode ...................................................................................................................... 30
Compensation (CoP) Menu .......................................................................................................................... 31
P851 Measurement Offset ..................................................................................................................... 31
P852 Temperature Source ..................................................................................................................... 31
P854 Fixed Temperature ....................................................................................................................... 31
P860 Sound Velocity ............................................................................................................................. 31
P645 Vapour Temperature Compensation ........................................................................................... 32
Stability (StA) Menu ..................................................................................................................................... 32
P870 Fill Damping ................................................................................................................................ 32
P871 Empty Damping ........................................................................................................................... 33
System (SyS1) Menu .................................................................................................................................... 33
P921 Enable Code ................................................................................................................................. 33
P922 Passcode ....................................................................................................................................... 33
P926 Software Revision ........................................................................................................................ 33
P928 Serial Number .............................................................................................................................. 33
P930 Factory Defaults ........................................................................................................................... 33
Test (tESt) Menu ........................................................................................................................................... 34
P991 Hard Test ...................................................................................................................................... 34
P992 mA Out Test ................................................................................................................................. 34
Chapter 6 Troubleshooting ................................................................................................................................ 35
Parameter Record .................................................................................................................................................. 36
Page 1
Chapter 1 Start Here…
Congratulations on your purchase of a Pulsar IMP+ i.s. Level Monitoring
System. This quality system has been developed over many years and
represents the latest in high technology ultrasonic level measurement and
control.
It has been designed to give you years of trouble-free performance, and a
few minutes spent reading this operating manual will ensure that your
installation is as simple as possible.
About this Manual
It is important that this manual is referred to for correct installation and
operation.
There are various parts of the manual that offer additional help or
information as shown:
Tips
TIP
At various parts of this manual you
will find tips to help you.
Additional Information
Additional Information
At various parts of the manual, you will find sections
like this that explain specific items in more detail.
Page 2
About the IMP+ i.s. Level Monitoring System
Functional Description
The IMP+ i.s. level monitoring system is a highly developed ultrasonic level
measurement system which provides non-contacting level measurement for
a wide variety of applications in both liquids and solids located in hazardous
areas. It is a 2 wire (loop powered) device.
Easy calibration and maintenance free “fit and forget” performance mean
that you can install the IMP+ i.s. Level Monitoring System rapidly and with
confidence. The measured distance, level or space is indicated by the current
drawn by the unit, fault conditions can be indicated by 3.5 or 22mA.
The IMP+ i.s. operates on the principle of timing the echo received from a
measured pulse of sound transmitted in air and utilises “state of the art”
echo extraction technology.
IMP+ i.s. comes in three models IMP 3 i.s. with a range from 0.20m (0.66
feet) to 3.00m (9.84 feet), IMP 6 i.s. with a range of 0.3m (0.98 feet) to
6.00m (19.69 feet) and IMP 10 i.s. with a range of 0.3m (0.98 feet) to
10.00m (32.81 feet).
Page 3
The IMP+ i.s. can show level, space, distance, on the display. The current
loop can be connected to a remote chart recorder or PLC that has a current
input, to monitor level, space or distance, dependant on the measurement
mode selected, and provides a ‘fault condition’ alarm of either 3.5mA or
22mA.
The IMP+ i.s. lid has an integral LCD display and 4 buttons which are used
for programming purposes when in Program Mode and as hot keys
providing additional information whilst in Run Mode.
Page 4
Product Specification
Physical
Dimensions O/A height 186mm (5.24 inches) x O/A
diameter 133mm (7.32 inches)
Mounting 1.5” BSP/NPT (IMP3 and 6 models) 2”
BSP/NPT (IMP10)
Weight Nominal 1kg
Cable entry 2 off cable glands 4.5 – 10mm. (torque to
2NM)
Environmental
IP Rating IP67
Min & Max Temperature (Ambient) -40 to +65°C (-40 to 149°F)
Min & Max Temperature (Transducer) -40 to +80°C (-40 to 176°F)
Approvals
CE Approval See EU Declaration of Conformity
Performance
Beam Angle <10° inclusive
Operating frequency Imp 3 125kHz, Imp 6 75kHz, Imp 10 41kHz
Range Imp 3 0.2 – 3m (0.66 – 10ft)
Imp 6 0.3 – 6m (0.98 – 20ft)
Imp 10 0.3 – 10m (0.98 – 33ft)
Digital echo processing
Accuracy ± 0.25% or 6mm (0.24 inches) whichever is
greater
Resolution ± 0.1% or 2mm (0.08inches) whichever is greater
4-20mA output Resolution 5µA
Temperature compensation via internal temperature sensor (± 0.5°C
accuracy)
Response time Power up to stable reading = 10 seconds
Input voltage range 12 – 26V DC at the IMP+ i.s. (not at the barrier)
Current output 3.5 – 22mA
Voltage input to IS barrier 20 – 24V DC
Programming
On-board programming via the 4-button keypad and 4-digit LCD
display
Page 5
EU Declaration of Conformity
Page 6
Chapter 2 Installation
Hazardous Area Installation
If the unit is to be used in a hazardous area, then power to the unit must pass
through an approved safety barrier or approved IS PSU.
Information specific to Hazardous Area Installation
(Reference European ATEX Directive 2014/34/EU, Annex II, 1.0.6.)
The following instructions apply to equipment covered by certificate number
Sira 06ATEX2014X:
1. The equipment may be used with flammable gases and vapours with
apparatus groups IIC, IIB, and IIA with temperature classes; T1, T2, T3,
T4 maximum ambient temperature range -40oC to +80oC.
2. The equipment is only certified for use in ambient temperatures in the
range -40oC to +80oC and should not be used outside this range
3. Installation shall be carried out in accordance with the applicable code of
practice by suitably-trained personnel
4. Repair of this equipment shall be carried out in accordance with the
applicable code of practice.
5. Certification marking as detailed in drawing number
D-804-0648-D.
6. If the equipment is likely to come into contact with aggressive
substances, then it is the responsibility of the user to take suitable
precautions that prevent it from being adversely affected, thus ensuring
that the type of protection is not compromised.
Aggressive Substances - e.g. acidic liquids or gases that may attack
metals or solvents that may affect polymeric materials.
Suitable Precautions - e.g. regular checks as part of routine inspections
or establishing from the material’s data sheet that it is resistant to
specific chemicals.
Page 7
7. The certificate number has an ‘X’ suffix that indicates that the following
special condition of certification applies;
In the case of IMP+ i.s. due to the housing and labels being nonconductive plastic care needs to be taken with regards electrostatic
charge. The equipment shall not be installed if the conditions are
conducive to the buildup of electrostatic charge. Additionally, the
equipment should only be cleaned with a damp cloth.
8. The manufacturer should note that, on being put into service, the
equipment must be accompanied by a translation of the instructions in
the language or languages of the country in which the equipment is to be
used and by the instructions in the original language.
Hazardous Area Specific Power Supply and barrier Requirements
The IMP+ i.s. operates from a DC supply of 12 –26V and will typically draw
less than 22mA. The unit must be powered from an approved i.s. safety
barrier or approved i.s. Power supply with the following limits:
IS Safety Barrier – Uo >= 28V, Io >=93mA, Pi >= 0.65W
IS Power Supply – Uo >= 25.2V, Io >=162mA, Pi >= 1.03W
Label from IMP3 i.s. showing certification details (6 & 10 are the same)
All electronic products are susceptible to electrostatic
shock, so follow proper grounding procedures during
installation.
Cable Entry
The IMP+ i.s. Series has two M16 cable entries, fitted with a suitable gland, to
ensure moisture protection is maintained.
Page 8
Terminal Connection Details
The IMP+ i.s is a 2 wire (loop powered) unit, the terminal connections for IMP+ i.s.
is detailed below. Wiring details are also given on the terminal label under the
access cover.
Terminal 1 + ve: Direct Current (DC) input (12-26VDC) via barrier
Terminal 2 - ve: Ground side
Voltage drop due to i.s. safety Zener barrier
The IMP+ i.s. are 2 wire, 4-20mA loop powered devices. If used with a Zener
barrier (which contains resistors in series with the output) you will experience a
voltage drop across the barrier. The IMP+ i.s. range can be powered from 1224VDC, but as the drop across the barrier can be up to 9V depending on the
barrier you are using and the current being drawn (worst case 22mA). You must
also allow for any voltage drops in the cabling from the barrier to the IMP+ i.s..
For example, if an IMP+ i.s. was supplied via a dual Zener barrier with 24V on the
safe side of the barrier then if the unit was drawing 4mA the drop would be
approx. 2V, if the current was 22mA then this would be approx 9V. So as the
IMP+ i.s. requires a minimum of 12V to function correctly, the supply to the IMP+
i.s. at 22mA would be: 24 – 9 = 15V, this means that you could cope with a
voltage drop in the cabling of 3V.
Consideration should be given to any voltage drop in the measuring device.
If you consider say 16/0.2 (0.5mm2) conductor, this has a resistance of
39ohms/km, so the maximum length of cable would be as follows:
Maximum voltage drop allowed = 3V
Maximum current = 22mA
So, allowable resistance = 3V / 22mA = 136ohms
Therefore, if you were using 16/0.2 conductors you could use the following
maximum length of cable:
16/0.2 cable resistance = 39ohms/km
You must double this as you have to account for the full length (there and back)
giving 78ohms/km, so,
Absolute maximum cable length = 136 / 78 = 1.7km
In practice allow a reasonable margin.
If you are using a galvanic isolator then you do not have to consider the drop
across the barrier, but you must consider losses in the cable.
Page 9
2 Wire (loop powered)
IMP+ i.s.
wiring detail
Important Information
The IMP+ i.s. when installed in a hazardous area must be supplied through an
approved safety barrier or approved i.s power supply.
Suitable recommended barriers:
Barrier Type
Suggested Barriers
See
Fig.
Pepperl & Fuchs
MTL
Single Zener Barrier
Z728
7728+
1
Dual Zener Barrier
Z788
7788+
2
Galvanic Isolator source
KFD2-STC4-Ex1
(source only)
5041(source only)
3
Galvanic Isolator sink
KFD2-STC4-
Ex1Y122583 (sink
only)
5043(sink or source)
3
Page 10
Source means the measuring device applies a resistive load and sink means the
measuring device supplies power
Barriers must be fitted with reference to the manufacturers datasheets.
Page 11
Location and mounting information
The compact one-piece construction of the IMP+ i.s. can be mounted easily
using the integral nose thread (1.5" or 2" BSP/NPT, dependent on model).
When choosing a location to mount the Imp, bear in mind the following:
• For access to the LCD display and programming buttons it is
recommended that you mount it in an area which is easily
accessible.
• The ultrasonic signal path should be free of falling material and
obstructions such as pipes, beams etc.
• The IMP3 should be mounted at least 20cm (0.66 feet) above the
maximum level of the material and be perpendicular to the surface.
Whilst the IMP 6 and 10 should be mounted at least 30cm (0.98
feet) above the maximum level of the material and be perpendicular
to the surface.
• The ambient temperature is between -20ºC and 65ºC.
• There should be no high voltage cables or electrical inverters close
by.
Page 12
Dimensions
The dimensions of the IMP+ i.s. are as shown below.
1.5" BSP/NPT – IMP 3 & 6 i.s.
2" BSP/NPT – IMP 10 i.s.
Page 13
Outdoor and Open Vessel Installation
The IMP+ i.s. can be simply mounted on a bracket, suitable for the application
and secured using the thread located at the top of the transducer
(2"BSP/NPT).
Care should be taken to ensure that the IMP+ i.s. is not installed in direct
sunlight, in order to avoid errors in the measurement of ambient
temperature.
Attention should also be taken, when mounting the unit, to ensure that
strong windy conditions are avoided, wherever possible, to prevent
abnormal operation.
IMP+ i.s.
Model
Range
L =
Blanking
Imp 3
i.s.
3 metres
(9.84 feet)
200mm
(0.66 feet)
Imp 6
i.s.
6 metres
(19.69 feet)
300mm
(0.98 feet)
Imp 10
i.s.
10 metres
(32.81 feet)
300mm
(0.98 feet)
“L” should as a minimum be at least that as detailed in the table above,
but can be greater if required.
Closed Vessel Installation
“L” should as a minimum be at least that as detailed in the table above, but
can be greater if required. The IMP+ i.s. can be simply screwed into a flange
and secured using the thread located at the top of the transducer (1.5" or
2"BSP/NPT, dependent on model).
Where possible use, a flange made of a synthetic material such as PVC, in
cases where a metal flange is used it is advisable to fit a suitable gasket
between the flange of the IMP+ i.s. and the connection to the vessel.
Page 14
Stand Pipe Installations
When mounting the IMP+ i.s. to a standpipe care should be taken to ensure
that the standpipe is of sufficient diameter with reference to its length, see
the table below for details:
Dia. (D)
Max. Length (L)
mm
inches
mm
inches
80
3
220
8
100
4
300
12
150
6
420
16
200
8
560
22
When using a standpipe, fixed to the top of a vessel, ensure that the open
end of the standpipe is clear of any obstructions such as weld seams, gaskets
etc. in order to avoid unwanted signal returns.
If using standpipes which extend in to the vessel, beyond the blanking
distance, but not as far as the empty level, then the open end of the standpipe
should be cut to an angle of 45o.
Correct
standpipe
installation
Pipe should be free
of obstructions
such as weld seams
The maximum
level (100% of
Span) is inside the
Blanking Distance
Page 15
Important Information
If the equipment is installed or used in a manner not specified in this
manual, then the protection provided by the equipment may be impaired.
Preparation for Operation
Before switching on, check the following:
✓ The safety barrier
✓ The power supply is correctly installed.
✓ The IMP+ i.s. is mounted correctly.
Maintenance
There are no user serviceable parts inside your IMP+ i.s., if you experience
any problems with the unit, then please contact Pulsar Process Measurement
for advice.
To clean the equipment, wipe with a damp cloth. Do not use any solvents on
the enclosure.
Page 16
Chapter 3 How To Use Your IMP+ i.s. Level Monitoring System
Operating the Controls
Display
Whilst in the Run Mode, the 4-digit LCD, by default, will display the
current level reading in metres, the display will also alternate between the
reading and “LOE” when a fault condition (Loss Of Echo) is detected.
When in the Program Mode the display is used to read information on the
Menu Options and the values entered.
There are two operating modes for your IMP+ i.s., Run Mode and Program
Mode.
Run Mode
This mode is used once the IMP+ i.s. has been set up in program mode. It is
also the default mode that the unit reverts to when it resumes operation after
a power failure.
When the IMP+ i.s. is switched on for the first time, it will display, in metres,
the distance from the transducer face to the target.
After you have set up the relevant parameters the 4-20mA drawn by the unit
will be proportional to the measured level.
Page 17
Program Mode
This mode is used to set up the IMP+ i.s. or change information already set,
this is achieved by using the 4 push buttons located below the display.
Entering a value for each of the menu options that are relevant to your
application provides all the programming information.
Button Functions
There are 4 push buttons located under the display. Their name and
functions are as follows:
Button
Run Mode
Program Mode
ESC
Displays details of unit
Serial No. and Software
Version
Used to Navigate out of the
Menu System and return to
Run Mode. Also, used to
Cancel a Parameter Value
entered in error.
UP
Displays Current
Temperature
Used for Navigating around
Menu System and Increasing
Menu Option Values.
DOWN
Displays Current Echo
Strength (dB’s)
Used for Navigating around
Menu System and Decreasing
Menu Option Values.
ENTER
Displays current mA output
Used to confirm an action such
as entering a Menu Option or
Enter a Parameter Value.
How to Access Program Mode
To access the Program mode, press the “ESC” and “Enter” button
simultaneously, where upon the display will show PASS on the LCD display
briefly, to prompt you to enter the password, the display will now show 0000, and
the left-hand digit will flash.
By using the UP and DOWN keys to increment or decrement the digit, and the
ENTER key to shift the flashing digit to the next position.
Page 18
Assuming the passcode is the default 1997, then you should enter this.
The ESC key can be used to go back to the previous digit. Finally, when you have
selected all digits pressing the ENTER key again will input the selected pass code
to the IMP+ i.s.; if successful the display will show APP (Application). If, however
you input the wrong pass code the IMP+ i.s. LCD display will show Fail for 2
seconds and will revert to run mode.
Using The Menu System
The menu system has been designed to make the changing of parameters very
simple. Once in the Program Mode the display will show a line of text that
displays the menu system. Pressing the Up and Down buttons will scroll the
display between the menu items, (as shown below, starting at APP).
As you press the UP and DOWN buttons to scroll left and right between the
menu options, you can press ENTER at any time to select a specific menu
which will then take you to the parameters within the selected menu.
Once you have reached the relevant menu, scroll through the parameters,
and enter the necessary information. To enter the information, use the UP
and DOWN keys to increment or decrement the digit, and the ENTER key
to shift the flashing digit to the next position, once you have completed
entering the value required pressing the ENTER button again will save the
value.
When you have finished, press ESC to go back to the previous level. When
you have reached the top level, then the IMP+ i.s. will ask for confirmation
before allowing you to go back into run mode. This is done by pressing
ENTER at the display prompt.
APP
(Application)
rL
(Relays)
UoL
(Volume)
DiSP
(Display)
Cop
(Compensation)
SyS1
(System)
tESt
(Test)
StA
(Stability)
LOOP (mA
Output)
Page 19
Parameter Defaults
Factory Defaults
Factory Defaults
When first installing the IMP+ i.s., or subsequently moving or using the unit
on a new application, before proceeding to program the unit for its intended
application it is recommended that you ensure that all parameters are at their
default values by completing a Factory Defaults P930, as described in
Chapter 5 Parameter Guide.
When you first switch the IMP+ i.s. on, it will be reading the distance from
the face of the transducer to the material surface. It will be indicating in
metres, as shown on the display.
TIP
In some applications, it is simplest to empty the
vessel, take a reading from the Imp for distance
and then setup the empty level to this figure.
Once you are satisfied with the installation, and the IMP+ i.s. is reading what
you would expect in terms of distance from the face of the transducer to the
material level, then you can proceed with programming, for the intended
application. It is sensible to program all the required parameters at the same
time. The system will be then set-up.
Note that the span is automatically calculated from the empty level, so the
empty level should be entered first.
Page 20
Chapter 4 Getting Results With Your IMP+ i.s.
This chapter will explain how to undertake the various functions of your
IMP+ i.s.. Where specific parameters are used, consult Parameter Guide in
Chapter 5.
Setting up Your Application
Empty Distance
Empty Distance (P105) is the distance from the face of the transducer to
the material at the bottom of the vessel.
Span
Span (P106) is the distance from the empty level (0% full) to span (100%
full).
Near and Far Blanking
Near blanking (P107) is the distance from the face of the transducer that
the IMP+ i.s. will not record a level nearer than. A typical reason to increase
this from the default value would be if you wish to ignore close in
obstructions.
Far blanking (P108) is the distance (as a percentage of empty level) beyond
the empty level that the IMP+ i.s. will read, the default is plus 20% of empty
level. If you wish to monitor further than the empty level, then increase this
figure, so that the empty level plus the far blanking figure (as % of empty
level) is greater than the surface being measured, within the capability of the
transducer being used.
The 4-20 mA Output
The mA output can be used to monitor remotely what the IMP+ i.s. is
showing, so it can be displayed remotely, integrated into a PLC, or used to
generate a record using a chart recorder or similar.
By default, the IMP+ i.s. will provide a 4-20 mA output that represents what is
displayed on the IMP+ i.s., but these parameters can be overwritten as follows.
Page 21
By default, the 4-20 mA will represent the empty level (4mA) and 100% of
the operational span (20mA), but you may wish to only represent a section
of the operational span. For example, the application may have an
operational span of 6 metres, but you may only wish to represent empty
level to 5 metres. If so, change P834 (Low Value) to 0, and P835 (High
Value) to 5.0.
If the device connected to the mA output is out of calibration, and cannot be
calibrated, then the low and high current levels can be trimmed by altering
P838 (Low Trim) and P839 (High Trim). To do this, simply enter the
value that ensures that 4 mA or 20 mA respectively are shown on the remote
device. You can use the left/right menu keys to alter the value until the
correct reading is shown on the remote device, rather than typing in a value.
Setting Security Passcodes
A passcode is used to switch the IMP+ i.s. from Run Mode into Program
Mode.
You can set a new passcode to prevent anyone changing any of your settings
within your IMP+ i.s. The default passcode is 1997, but this may be changed
as follows.
Additional Information
The passcode is also used for remote access using the RS232, so if this is
being used, be sure to ensure any additional equipment using this feature is
changed accordingly.
Using A Passcode
If you don’t want to use a passcode, you can disable it as follows. First,
enter Program Mode and go to the SyS1 (System) menu. Select P921
which is the passcode enable parameter.
As shown on the display, setting the passcode enable to ‘0’ will disable it,
or ‘1’ will enable the use of passcode.
Additional Information
If the use of a passcode has been disabled, then you can move straight into
Program Mode from Run Mode by pressing the ESC and ENTER button
simultaneously.
Page 22
Changing the Passcode
You can set the passcode to any number from 0000 to 9999. To do this,
enter Program Mode and go to SyS1 (System) menu. Select P922 which is
the Passcode parameter which can be changed as required.
Resetting Factory Defaults
If you need to restore parameters to their original factory settings, then enter
Program Mode go to the SyS1 (System) menu and ENTER. Using the UP
and DOWN buttons, go to parameter P930, and ENTER, P930 is the
factory defaults parameter, change the value to 1 and ENTER , all
parameters, with the exception of the mA trims, will be restored to the
factory settings (including the DATEM trace) and on completion Stor
(Store) will be displayed after which you can ESC out of this parameter and
continue programming the IMP+ i.s. for the required application.
Checking the Information Specific to your IMP+ i.s.
There are some parameters dedicated to each individual IMP+ i.s., such as the
software revision and the unit’s serial number.
Checking the Software Revision and Serial Number
If you need to identify the serial number of the unit or the current level of
software in your IMP+ i.s., whilst in Run Mode press the ESC button and the
serial number along with the software revision will be displayed.
Alternatively enter Program Mode and select SyS1 (System) menu and
ENTER. Select parameter P926 to view the identity of the current firmware
revision or P928 for the serial number of the unit.
Page 23
Chapter 5 Parameter Guide
This chapter describes all the parameters in your IMP+ i.s..
Parameter Listing
This section describes all the parameters contained within the IMP+ i.s..
Application (APP) Menu
P100 Mode of Operation
This parameter sets the mode of operation, when in run mode, and can be set
to one of the following:
Option
Description
1= Distance (Default)
Display shows the distance from the
transducer face to the surface.
2= Level
Display shows how full the vessel is.
3= Space
Display shows how empty a vessel is.
4= Volume
Display shows volume of material in the
vessel
P104 Measurement Units
This parameter sets the units you want to use for programming and display
Option
Description
1 = metres
All units of measure are METRES
2 = cm
All units of measure are CENTIMETRES
3 = mm
All units of measure are MILLIMETRES
4 = feet
All units of measure are FEET
5 = inches
All units of measure are INCHES
P105 Empty Level
This parameter is to be set to the maximum distance from the face of the
transducer to the empty point, in P104 Measurement Units. Note this value
affects span as well, so should be set before span. Default: IMP 3 = 3.00m
(9.94 feet), IMP 6 = 6.000m (19.69 feet) and IMP 10 = 10.00m (32.81
feet).
Page 24
P106 Span
This parameter should be set to the maximum distance from the Empty
Level (P105) to the maximum material level. It is automatically set to be
equal to the Empty Level (P105) less the Near Blanking distance (P107),
when you set the empty level. Default IMP 3 = 2.80m (9.19 feet), IMP 6 =
5.70m (18.70 feet) and IMP 10 = 9.70m (31.82).
P107 Near Blanking Distance
This parameter is the distance from the face of the transducer that is not
measurable, and is pre-set to the minimum value dependant on the version
of IMP+ i.s. being used. It should not be set to less than this figure, but can be
increased.
IMP+ i.s Version
Near Blanking Distance
IMP 3 metre
Default Blanking Distance = 0.2m (0.66 feet)
IMP 6 metre
Default Blanking Distance = 0.3m (0.98 feet)
IMP 10 metre
Default Blanking Distance = 0.3m (0.98 feet)
P108 Far Blanking Distance
This is the distance (as a percentage of empty level) beyond the empty
point that the unit will be able to measure, and the default is pre-set to 10%
of the empty level.
If the surface being monitored can extend beyond the Empty Level (P105)
then the far blanking distance can be increased to a maximum of 100% of
empty level.
This parameter is always entered as a % of empty level.
Page 25
Volume (UoL) Menu
P600 Vessel Shape
This parameter determines which vessel shape is used when utilising
“Volume Conversion”.
The choices are as shown in the table below, along with the dimensions that
are required to be entered (P601-P603).
Vessel Shape
P600 Value
Dimensions
Required
P600=0 Cylindrical
Flat base (Default)
Cylinder diameter
P600=1=Rectangular
Flat base
Width and Breadth
P600=2 Cylindrical
Cone base
Cylinder diameter
and height of
bottom
P600=3 Rectangular
Pyramid base
Width and Breadth
of rectangular
section and height
of bottom
P600=4 Cylindrical
Parabola base
Cylinder diameter
and height of
bottom
P600=5 Cylindrical
Half-sphere base
Cylinder Diameter
Page 26
Vessel Shape
P600 Value
Dimensions
Required
P600=6 Cylindrical
Flat sloped base
Cylinder diameter
and height of
bottom
P600=7 Rectangular
Flat sloped base
Width and Breadth
of rectangular
section and height
of bottom
P600=8 Horizontal
cylinder with flat ends
Cylinder diameter
and tank length
P600=9 Horizontal
cylinder with
parabolic ends
Cylinder diameter,
length of one end
section, and tank
length
P600=10 Sphere
Sphere diameter
Page 27
P601-P603 Vessel Dimensions
These three parameters are used to enter the dimension required to calculate
the volume. The dimensions required are as shown below.
Vessel Shape
P601
P602
P603
P600=0 Cylindrical
Flat base
Cylinder
Diameter
P600=1 Rectangular
Flat base
Width of
rectangle
Breadth of
rectangle
P600=2
Cylindrical Cone base
Height of
base
Cylinder
Diameter
P600=3 Rectangular
Pyramid base
Height of
base
Width of
rectangle
Breadth of
rectangle
P600=4 Cylindrical
Parabola base
Height of
base
Cylinder
Diameter
P600=5
Cylindrical Half-sphere base
Cylinder
Diameter
P600=6
Cylindrical Flat sloped base
Height of
base
Cylinder
Diameter
P600=7
Rectangular Flat sloped base
Height of
base
Width of
rectangle
Breadth of
rectangle
P600=8
Horizontal cylinder with flat
ends
Length of
Cylinder
Cylinder
Diameter
P600=9
Horizontal cylinder with
parabolic ends
Length of
Cylinder
Cylinder
Diameter
Length of
one end
section
P600=10
Sphere
Sphere
Diameter
P604 Calculated Volume
This parameter displays the maximum volume that has been calculated by
the IMP+ i.s. and is a Read Only parameter. The volume displayed will be
shown in cubic meters and is the total volume available between empty
level (P105) and 100% of span (P106).
Page 28
P605 Volume Units
This parameter determines the units that will be used in calculating volume
conversion. It is used in conjunction with P607 (maximum volume), please
note that there is no provision for the volume unit’s descriptor to be shown
on the display.
The choices are:
Option
Description
0 = No Units
Volume will be totalised with no units
1 = Tons
Volume will be totalised in Tons
2 = Tonnes
Volume will be totalised in Tonnes
3 = Cubic metres
Volume will be totalised in cubic metres
4 = Litres
Volume will be totalised in litres
5 = UK Gallons
Volume will be totalised in UK Gallons
6 = US Gallons
Volume will be totalised in US Gallons
7 = Cubic feet
Volume will be totalised in cubic feet
8 = Barrels
Volume will be totalised in barrels
P606 Correction Factor
This parameter is used to enter a correction factor, when required, such as
the specific gravity of the material so that the volume calculated is relative
to the actual amount of material that can be contained between empty level
(P105) and 100% of span (P106). Default = 1
P607 Max Volume
This parameter displays the actual maximum volume that has been
calculated by the IMP+ i.s., i.e. P604 Calculated Volume x P606 Correction
Factor, and is a Read Only parameter. The volume displayed will be shown
in P605 Volume Units and is the total volume available between empty
level (P105) and 100% of span (P106).
Page 29
Display (DiSP) Menu
P800 Display Units
This parameter determines whether the reading displayed is in
Measurement Units (P104), or as a percentage of span.
Option
Description
1 = Measured (Default)
Display is in Measurement Units (P104)
2 = Percentage
Display is in percentage of span.
P801 Decimal Places
This parameter determines the number of decimal places on the reading
during run mode.
Minimum = 0 (No decimal places), Maximum 3 = (3 decimal Places)
Default = 2
P808 Fail-safe Mode
By default, if a fail-safe condition occurs, then the display and the mA
output are held at their last known values until a valid reading is obtained.
If required, then you can change this so that the unit goes to high (100% of
span), or low (empty) as follows:
Option
Description
1 = Known (Default)
Remain at the last known value
2 = High
Will fail to the high value (100% of Span).
3= Low
Will fail to the low value (empty)
P809 Fail-safe Time
In the event of a fail-safe condition occurring the fail-safe timer determines
the time before fail-safe mode is activated. Default = 2.00 mins
If the timer activates, the unit goes into fail-safe, as determined by P808,
(Display and P840 (mA Output). When this happens, you will see the
message “LOE!” on the display.
When a valid measurement is obtained then the display and mA output will
be restored and the timer is reset.
Page 30
mA Output (LOOP) Menu
P834 mA Low Level
This parameter sets, in Measurement Units (P104), the value of ‘level’,
‘space’ or ‘distance’, depending on the selected Mode of Operation (P100),
at which 4mA will occur.
P835 mA High Level
This parameter sets, in Measurement Units (P104), the value of ‘level’,
‘space’ or ‘distance’, depending on the selected Mode of Operation (P100),
at which 20 mA output will occur.
P838 mA Low Trim
If the device you are connected to is not calibrated, and not showing the low
value, then you can trim it using this parameter. You can either type in the
offset directly, or use the arrow keys to move the output up and down until
you get the expected result on the device that is connected.
P839 mA High Trim
If the device you are connected to is not calibrated, and not showing the
high value, then you can trim it using this parameter. You can either type in
the offset directly, or use the arrow keys to move the output up and down
until you get the expected result on the device that is connected.
P840 mA Fail-safe Mode
This parameter determines what happens to the mA output in the event of
the unit going into fail-safe mode. The default is to do the same as the
system fail-safe (P808), but this can be overridden to force the mA output
to an independent fail-safe mode as follows:
Option
Description
0 = Default
mA output will fail as per P808.
1 = Hold
mA output will retain its last known value.
2 = Low
mA output will fail to its low condition. 3.5mA
3 = High
mA output will fail to its high condition. 22mA
Page 31
Compensation (CoP) Menu
P851 Measurement Offset
The value of this parameter is added to the measured distance, in
Measurement Units (P104).
This Offset will be added to the level, as derived from the transducer, and
will affect everything including the reading on the display and the mA
output.
P852 Temperature Source
This parameter determines the source of the temperature measurement. By
default, it is set to internal (transducer) (P852=1), which will automatically
detect the temperature from the transducer. If for any reason, no temperature
input is received, then the Fixed Temp value is used, as set by P854.
The temperature source can be specifically set as follows:
Option
Description
1 = Internal (Default)
Always uses temperature reading from
transducer.
3 = Fixed
Always uses fixed temperature (P854)
P854 Fixed Temperature
This parameter sets the temperature, in degrees centigrade to be used if
P852 (Temperature Source) =3. Default = 20oC
P860 Sound Velocity
This option allows for the velocity of sound to be changed according to the
atmosphere the transducer is operating in. By default, the velocity is set for
342.72m/sec which is the speed of sound travelling in air at a temperature of
20oC.
Page 32
The table below gives details of the velocity of sound in various gaseous
atmospheres In all cases the velocity indicated is that in a 100% gaseous
atmosphere at 0oC. In atmospheres less than 100% it may be necessary to
check the level indicated at near empty and near full and compare with the
actual level, several times, then adjust the Sound Velocity accordingly to
obtain an accurately displayed reading.
Gas
Sound Velocity
Chlorine
206 m/sec
Argon
308 m/sec
Oxygen
316 m/sec
Air
331.5 m/sec
Ammonia
415 m/sec
Methane
430 m/sec
Helium
435 m/sec
Neon
965 m/sec
P645 Vapour Temperature Compensation
The sound velocity in air increases or decreases at a uniform rate of
60cm/sec. per oC, however in atmospheres other than air it will change at a
different rate.
This option allows the rate of change in cm/sec. per oC to be set according to
the atmosphere and temperature present. The level indicated, should be
compared with the actual level, several times, then Vapour Temperature
Compensation adjusted accordingly, to obtain an accurately displayed
reading. Default = 60 cm/sec. per oC
Stability (StA) Menu
Damping
Damping is used to damp the display, to enable it to keep up with the
process but ignore minor surface fluctuations.
P870 Fill Damping
This parameter determines the maximum rate at which the unit will respond
to an increase in level. It should be set slightly higher than the maximum
vessel fill rate. Default = 10.00 metres/minute (32.81 feet/minute)
Page 33
P871 Empty Damping
This parameter determines the maximum rate at which the unit will respond
to a decrease in level. It should be set slightly higher than the maximum
vessel empty rate. Default = 10.000 metres/minute (32.81 feet/minute)
System (SyS1) Menu
The following three parameters do not affect how the unit performs, but
details, contained in them, may be required, by Pulsar, when making
technical enquiries.
P921 Enable Code
Enables the passcode (P922), which means the passcode must be entered
to go into program mode. If disabled (set to 0), then no passcode is
required, and pressing ESC and ENTER button simultaneously will allow
entry into the program mode.
P922 Passcode
This is the passcode that must be used to enter program mode. The default
is 1997, but this can be changed to another value.
P926 Software Revision
This parameter will display the current software revision.
P928 Serial Number
This parameter will display the serial number of the unit.
P930 Factory Defaults
This parameter resets all parameter values to the original Factory Set values
that were installed when the unit was tested, before despatch to you.
To reset parameters, enter 1 and press ENTER, all parameters, except for the
mA trims, will be restored to the factory settings (including the DATEM
trace) and on completion Stor (Store) will be displayed after which you can
ESC out of this parameter and continue programming the IMP+ i.s. for the
required application.
Page 34
Test (tESt) Menu
P991 Hard Test
When this parameter is selected, the unit will test the following in turn.
• Display. All the segments on the LCD are lit up, so you can see if
they all work. Press the ENTER button, to end the test.
• Keys. You should press each button, to confirm it works, with a
counter showing how many more buttons you must press. Press
ESC last, as this will show if all keys were pressed or not. If they
were not, then an error message is displayed.
P992 mA Out Test
This parameter will allow you to force a specified current on the mA output,
to test the equipment that it is connected to, and to make sure the unit is
working correctly. The figure you enter will be generated by the mA output.
Page 35
Chapter 6 Troubleshooting
This section describes many common symptoms, with suggestions as to
what to do.
Symptom
What to Do
Display blank, transducer not
firing.
Check power supply
Display shows “L0E”.
No valid echo being received and unit
has gone into fault condition. Check
material level is not out of range,
sensor is perpendicular to material
surface.
Incorrect reading being
displayed for current level.
Measure actual distance from
transducer face to surface of material.
Enter Program Mode and access SyS1
menu, go to P21 and press ENTER
type in the measured distance, press
ENTER, wait until “Stor” is
displayed and return to Run Mode,
display should now update to correct
reading.
Material level is consistently
incorrect by the same amount.
Check empty level (P105) correctly
entered.
Page 36
Parameter Record
APPLICATION (APP) MENU
Parameter Details
Entered Values
No.
Description
Default
1 2 3 4 5
P100
Mode
1 = Dist.
P104
Measurement Units
Model Dependant
P105
Empty Level
Model Dependant
P106
Span
Model Dependant
P107
Near Blanking
Model Dependant
P108
Far Blanking
10.0%
VOLUME (UoL) MENU
Parameter Details
Entered Values
No.
Description
Default
1 2 3 4 5
P600
Vessel Shape
0 P601
Vessel Dimension 1
0.00 P602
Vessel Dimension 2
0.00 P603
Vessel Dimension 3
0.00 P604
Calculated Volume
Read Only
P605
Volume Units
Model Dependant
P606
Correction Factor
1 P607
Max Volume
Read Only
DISPLAY (DisP) MENU
Parameter Details
Entered Values
No.
Description
Default
1 2 3 4 5
P800
Display Units
1 = measured
P801
Decimal Places
2 P808
Fail Mode
1 = Known
P809
Fail Time
2.0 mins
mA OUTPUT (LOOP) MENU
Parameter Details
Entered Values
No.
Description
Default
1 2 3 4 5
P834
Low Level
0.000 P835
High Level
Model Dependant
P838
Low Trim
0.00 mA
P839
High Trim
0.00 mA
P840
Fail Mode
0 = Default
Page 37
COMPENSATION (CoP) MENU
Parameter Details
Entered Values
No.
Description
Default
1 2 3 4 5
P851
Measurement Offset
0.000 metres
P852
Temperature Source
1 = Automatic
P854
Fixed Temperature
20.00 Deg. C
P860
Sound Velocity
342.72 m/sec
P645
Vapour Temp. Comp.
60cm/sec per oC
STABILITY (StA) Menu
Parameter Details
Entered Values
No.
Description
Default
1 2 3 4 5
P870
Fill Damping
Model Dependant
P871
Empty Damping
Model Dependant
SYSTEM (SyS1) MENU
Parameter Details
Entered Values
No.
Description
Default
1 2 3 4 5
P921
Enable Code
1 = Yes
P922
Passcode
1997 P926
Software Revision
Read Only
P928
Serial Number
Read Only
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