Hydreka 801 User manual

801 Operation Manual Page 1
HYDREKA
Model 801
Electromagnetic Flow Meter
Operation Manual

801 Operation Manual Page 2
CONTENTS
SECTION DESCRIPTION PAGE
1. INTRODUCTION ..................................................................................................................3
2. EQUIPMENT .................................................................................................................. 3
2.1. Standard 801 System............................................................................................................. 3
2.2. Wading Accessories.............................................................................................................. 3
2.3. Options .................................................................................................................. 3
3. DESCRIPTION ..................................................................................................................4
4. SYSTEM OPERATION .................................................................................................................. 6
4.1. Setting up ..................................................................................................................6
4.2. Switch on ..................................................................................................................6
4.3. Running the unit ...............................................................................................................7
4.4. Setting Units, Averaging Mode and Averaging Period ........................................................ 9
4.4.1. Changing Averaging Period.................................................................................... 10
4.5. OPTIONS menu [Logging, Beeper, Backlight, Direct EM Comms].................................... 11
4.6. LOGGING menu .............................................................................................................. 12
4.6.1. Change Date/Time .................................................................................................. 13
4.6.2. Viewing stored data ................................................................................................ 14
4.6.3. Extracting data ........................................................................................................ 15
4.7 Analogue output [factory fit option] ..................................................................................... 16
5. POWER SUPPLY ..................................................................................................................17
5.1. Changing batteries................................................................................................................. 17
5.2. Battery Life .................................................................................................................. 17
5.3. External power [factory fit option] ....................................................................................... 17
6. CALIBRATION .................................................................................................................. 18
7. CARE AND MAINTENANCE .......................................................................................................... 20

801 Operation Manual Page 3
1. INTRODUCTION
This manual covers the operation of the Model 801 Electromagnetic Flow Meter.
2. EQUIPMENT
2.1. Standard 801 System
The standard 801 system has a choice of sensors and comprises the following, and can be used with either 19 or
20mm diameter wading rods which customers may already have for use with impeller current meters:
0801013 Single axis, cylindrical sensor c/w 2m cable and connector
or
0801004 Single axis, flat sensor c/w 2m cable and connector
0801006 Wading Rod adaptor [only supplied for the flat sensor 0801004]
0801007 Allen Key for wading rod adaptor
0801005 Control and Display Unit
0801008 Carrying case
0801811 Operating manual
2.2. Wading Accessories
The following accessories are available for wading operations:
0801003 Set of 3 off 0.5 metre wading rods, graduated in centimetres, base and direction knob
0801010 Canvas shoulder bag for wading accessories
2.3. Options
0300012 Data cable to computer
0801011 Larger carrying case to take complete system with wading rods [instead of standard case
and canvas shoulder bag]
Analogue output option

801 Operation Manual Page 4
3. DESCRIPTION
The 801 electromagnetic flow meter uses the Faraday principle to measure the flow of water past the sensor. Two
different types of sensor are available for the 801: the cylindrical sensor and flat sensor.
The cylindrical sensor has its electrodes on the side and the volume of water that is being sensed is a spherical
volume around the sensor to a diameter of about 120mm. Because of this relatively large sensing volume, the
cylindrical sensor should not be used in situations where the water boundary [bottom, sides or surface] is closer
than 40mm to the sensor.
The flat sensor has the sensing electrodes on one surface of the sensor and these should normally be facing
uppermost. The volume of water whose flow is being sensed is a cylinder between the electrodes and extending to
approximately 10mm above the sensor. This sensor is therefore also suited to shallow applications. Because of the
small sensing volume, if the water is turbulent, the real time readings of the flat sensor will fluctuate more than
those of the cylindrical sensor.
The sensor should be aligned into the flow and the calibration is determined for +ve flow [flow on to the sensor at
the electrode end] with the sensor upstream of the wading rod.
The sensor will detect negative flow and the same calibration is used, although there will normally be some
interference caused by the turbulence from the wading rods. The unit is set to measure speeds up to 5 M/sec in
both directions.
The system is calibrated as a combination of sensor with electronics in the Control Display Unit, and the serial
number of both the probe and the CDU are displayed on the display on start up.
The system will operate in any conducting fluid, and the conductivity does not effect calibration. At very low
conductivities the signal will, however, become noisier. A simple check is to check the noise in still water.
The CDU has its own internal batteries, and bulkhead connectors for the data interface to PC and the sensor.
There is also a waterproof pressure equalising valve, to compensate for changes in temperature and atmospheric
pressure that would otherwise cause the display membrane to distort. The connectors have waterproof pro-caps for
when not in use. The CDU is designed for operation in rain conditions and for temporary immersion in water to
0.3m for 10 seconds, provided all connectors or pro-caps are fitted.
FLOW
FLOW
Sensing Volume of
Cylindrical Sensor
Sensing Volume of
Flat Sensor

801 Operation Manual Page 5
The EM system measures the flow twice every second, and calculates the real time
flow every second as the average of the half second readings. The REAL TIME
display is updated every second. The average speeds are computed as the average of
the one second real time values over the averaging period which has been set
[maximum period of 600 seconds]. If an average period is terminated early, then
the calculation is based on the time since the average was started.
The 2Hz data from the EM system has been digitally filtered from raw 96Hz data.
The filter is a Digital FIR filter with a fixed time delay and no frequency
dependent phase shift. The filter –3dB cut off is 0.27Hz, and the delay time is
3.5 seconds.
The STANDARD DEVIATION [SD] is calculated from real time samples taken during the
averaging period and gives an indication of the quality of the measurements. A
high standard deviation indicates either a high variability in the flow, or the
probe has not been held steady during the measurement.
There are 3 types of Averaging Modes:
Fixed average:
The unit performs one average over the period set. At the end of the averaging period the unit
stops and displays the average and SD. It will commence another averaging period when
requested by pressing START.
Free running:
This is fixed average with automatic restart of averaging period at the end of each period. The
average and SD from the previous period are displayed and held during the subsequent period,
until updated.
Moving average:
The average and SD are calculated over the averaging period set, and is updated every second.
When STOP is selected, the display is frozen at the last average.
If the measurement period is terminated prematurely [by pressing the STOP key], the average values and
standard deviation will be calculated over the time since the start of the current averaging period.
The data [speed, SD, averaging period] is available for direct interfacing to a PC in real time [see Section
4.6.3. for interfacing information]:
In fixed average a data string of average data is outputted at the end of averaging period.
In moving average the last saved average is outputted when the user presses the STOP key.
In free running mode the data is outputted at the end of each fixed average period and also when the user
presses the STOP key.
The CDU can log up to 999 averages for subsequent display and/or transfer to a PC.
The analogue output is +/-5volts for the speed range +/-5 M/sec, and the analogue signal is based on the latest
average figure shown on the CDU. The analogue output connector also enables external DC to be applied.

801 Operation Manual Page 6
4. SYSTEM OPERATION
4.1. Setting up
To prepare the system for use:
i] Clean the probe electrodes to remove any grease or dirt.
ii] Insert batteries [8 off 1.5v C type cells], if external power not being used. It is recommended that alkaline type
cells are used for maximum life.
iii] Connect cables for particular combination of hardware being used.
iv] If using with probe fixed to wading rods then assemble probe into adaptor [clamping using the small grub
screw] and fix to rods, base and direction knob assembly.
v] If mounting the probe by other means, it should be noted that the mounting may affect the flow characteristics
and thus introduce an error into the measurement. Users can of course adjust results by carrying out their own
calibration.
Once the system has been connected up, it is ready for use. For testing purposes, all of the CDU operations can be
carried out without the sensor in water, but the real time data will be meaningless.
4.2. Switch on
ON Switch unit On using ON button. This is acknowledged by a beep from
the unit. This key is also used to switch the unit Off at any point during
operation. Switching the unit On causes the following display to appear:
CONTINUE Places the unit in Run Mode. See Section 4.3.
OPTIONS SET-UP This key selects the OPTIONS menu, which allows the user to set up
various hardware configurations [Logging On/Off, Beeper On/Off and
Backlight On/Off]. This menu also allows access to the USER
CALIBRATION menu, and to the LOGGING MENU. For further
information refer to Section 4.5.
801SINGLEAXISEMFLOWMETER
VALEPORT MODEL 801 VER 2 . 00
EM Ser No 17668 UNIT Se r No 17115
<<<OPT IONS SETUP CONT INUE>>>

801 Operation Manual Page 7
4.3. Running the unit
Pressing CONTINUE at the title screen, or pressing EXIT at any of the OPTION SET-UP screens [see Section
3.6] reveals one of the three possible displays shown below, depending on what mode the unit was in when last
used [note that until START is pressed, no flow data is displayed].
DISPLAY 1: FIXED AVERAGE
FIXED AVERAGE 801 HH:MM:SS
STOP>>>
TTT SSS SECS
SETUP>>>
REAL AVERAGE
+ X . XXX + X . XXX M/ SEC SD=X . XXX START>>>
LOW B
A
TT
DISPLAY 2: MOVING AVERAGE
MOVING AVERAGE 801 HH:MM:SS
STOP>>>
SSS SSS SECS
SETUP>>>
REAL AVERAGE
+ X . XXX + X . XXX M/ SEC SD=X . XXX START>>>
DISPLAY 3: FREE RUNNING
FREE RUNN I NG 8 0 1 HH : MM : SS
STOP>>>
TTT SSS SECS
SETUP>>>
REAL AVERAGE
+ X . XXX + X . XXX M/ SEC SD=X . XXX START>>>
An explanation of the different averaging modes can be found in the Description, Section 3.
SETUP Press this key to alter current sampling regime. See Section 4.4.
START After an initialisation period of about 10 seconds, during which the
following display will appear, the unit will begin sampling in the mode
which has been set. The real time data will be displayed at the bottom of
the screen, updated every second. In Free Running and Fixed Average
modes, the count down within the average period is displayed. If the unit
is in logging mode, the current record number will be displayed at the top
right hand side of the screen. If the data interface lead is connected, the
end of average values will also be sent to the PC.

801 Operation Manual Page 8
INITIALISING EM
PLEASE WA I T
STOP Press to cease sampling. This will force an early end to an averaging
period at the next second.
LOW BATT When there is approximately 4 hours of battery life remaining [with
backlight], this message will be displayed at the bottom right hand corner
of the screen [see DISPLAY 1 for an example]. The message will remain
until batteries are replaced. See Section 5. for more information on power
consumption and battery life.

801 Operation Manual Page 9
4.4. Setting Units, Averaging Mode and Averaging Period
Selecting SET-UP in the Run Menu reveals the following display.
RUN MENU SETUP
<<<M/ SEC FT / SEC OPT IONS>>>
<<<F I XED MOVING FREE ACCEPT>>>
<<<AVERAGE PER I OD SSS SECS
M/SEC FT/SEC Toggles between measuring the Speed in metres and feet per second.
FIXED MOVING FREE Toggles the averaging mode between the three states. Refer to Section 3
for further details.
AVERAGING PERIOD The Averaging Period which has been set is displayed. If it is required to
change this, then press the key to move to the “Change Sampling” page.
Refer to Section 4.4.1.
OPTIONS Press this key to return to the OPTIONS menu [Section 4.5.]
ACCEPT When the sampling regime is correctly set up, press this key to return to
the RUN menu [Section 4.3.].

801 Operation Manual Page 10
4.4.1. Changing Averaging Period
Selecting AVERAGING PERIOD in the RUN SET UP screen reveals the following display:
INCR DECR Toggles between increasing and decreasing the number of seconds when
the relevant key is pressed.
100'S Changes the number of 100's of seconds in the averaging period.
10'S Changes the number of 10's of seconds in the averaging period.
1's Changes the number of 1's of seconds in the averaging period.
EXIT Returns to the RUN MENU SETUP screen [Section 4.4].
Note that "000" seconds cannot be set, and the maximum is 600 seconds.
CHANGE SAMP L I NG
<<<100 ' S
<<<10 ' S INCR DECR>>>
SSS SECONDS
<<<1 ' S EX I T>>>

801 Operation Manual Page 11
4.5. OPTIONS menu [Logging, Beeper, Backlight, Direct EM Comms]
Pressing OPTIONS SET-UP at the Title Screen or OPTIONS in the Run Menu Setup screens reveals the
following display.
LOGGING YES/NO This key switches the logging facility On and Off. Up to 999 records
may be stored.
BEEPER ON/OFF Toggles audible indication [once per second] that measurements are
being made.
BACKLIGHT ON/OFF This key toggles it On and Off. Refer to POWER CONSUMPTION,
Section 5 for details of battery life with and without backlight.
LOGGING MENU Allows access to LOGGING MENU. This enables the user to view or
erase stored data, to extract it to a PC [via data interface lead], and to set
the unit date and time. Refer to Section 4.6.
SUB OPTIONS This enables the user to go into the sub – options menu which allows
direct EM communications with a PC [via data interface lead] for viewing
EM data and setting of the calibration coefficients. Refer to Section 6.
This sub-options menu also allows, if the options are fitted, frequency
outputs and alarms to be set.
EXIT Puts the unit into Run Mode, using the hardware configurations selected
[see Section 4.3].
OPT I ONS MENU
< < < LOGG I NG YES / NO LOGG I NG MENU> > >
<<<BEEPER ON / OFF SUB OPT I ONS>>>
<<<BACKL IGHT ON/OFF EX I T>>>

801 Operation Manual Page 12
4.6. LOGGING menu
Selecting LOGGING MENU at the OPTIONS MENU reveals the following display.
LOGG I NG MENU
<< <SET DATE / T I ME EXTRACT DATA> >>
<<<RESET # I DENT ERASE MEMORY>>>
<<<V IEW DATA EXI T>>>
SET DATE/TIME Allows access to the CHANGE DATE/TIME screen. This allows the
user to alter the unit's internal clock, for the purpose of correctly time
stamping the recorded data. See Section 4.6.1.
RESET #IDENT Sets the memory pointer to record #1 and updates the series letter. For
example, a second series of records would begin with record #001B.
VIEW DATA Allows user to see logged data. See Section 4.6.2.
EXTRACT DATA Allows user to upload stored data to a PC. See Section 4.6.3.
ERASE MEMORY Clears all stored data from the unit and resets data series identification to
"A"; it does not reset #IDENT to zero which has to be done by the
RESET #IDENT key, which should be done first otherwise the series B
identification will be set. A screen will appear, requesting confirmation
that the user wishes to erase memory. Press YES to continue, or EXIT to
return to LOGGING MENU. If YES is pressed, a message will confirm
that memory has been erased. Press EXIT to return to LOGGING
MENU.
EXIT Returns user to OPTIONS MENU. Refer to Section 4.5.

801 Operation Manual Page 13
4.6.1. Change Date/Time
Selecting SET DATE/TIME at the LOGGING MENU reveals the following display.
CHANGE DATE / T I ME
<<<NEXT I NCREASE>>>
T I ME : HH : MM DECREASE>>>
DATE : DD / MM/ YYYY
EXI T>>>
INCREASE Increases the currently selected number by 1.
DECREASE Decreases the currently selected number by 1.
NEXT Selects the next number in the time/date sequence.
EXIT Returns user to LOGGING MENU. Refer to Section 4.6.

801 Operation Manual Page 14
4.6.2. Viewing stored data
Selecting VIEW DATA at the LOGGING MENU reveals a display similar to that shown below. If no data has
been stored, the message NO DATA STORED will be displayed.
The display shows the record number, serial number, units in which velocity is measured [metres or feet per
second], run mode, and time at which the record was stored [i.e. the end of the averaging period].
UP Toggles the record to be viewed up by one.
DOWN Toggles the record to be viewed down by one
VIEW Allows user to view the record currently selected. A display of the
format shown below will be seen. Press EXIT on this screen to return to
the VIEW DATA screen, allowing another record to be seen.
EXIT Returns to the LOGGING MENU. Refer to Section 4.6.
# I DENT FFFR
SPEED +X . XXX
SD= X . XXX
AV PER I OD SECS SSS
EXI T>>>
#IDENT FFFR
EM SER NO . XXXXX UP>>>
UN I TS XXXXXX
RUN MODE XXXXXXXXXXXXX DOWN>>>
DD /MM / YYYY HH : MM : SS
<<<V IEW EX I T>>>
#IDENT FFFR
SPEED +X . XXX
SD= X . XXX
AV PER I OD SECS SSS
EX I T>>>

801 Operation Manual Page 15
4.6.3. Extracting data
Selecting EXTRACT DATA at the LOGGING MENU reveals the following display.
Connect the unit to a PC via the data interface lead supplied. Run a terminal emulation program on the PC,
ensuring that communications are correctly set to 4800 baud, 8 data bits, 1 stop bit, no parity bits, flow control
NONE. If the data is to be saved on the PC, make sure that the data is directed to a file name. It is uploaded as a
text file, with “Tab” delineators, so it can be read into a word processor or spreadsheet application.
The data lead connector information is:
CDU end Function PC end
4 way in-line Male MilSpec connector
[LMH06F 08 04 PN] [pins]
9 way “D” type
female [sockets]
Pin A RTS from PC [not used] Socket 7
Pin B Tx RS232 from PC to CDU Socket 3
Pin C Gnd Socket 5
Pin D Rx RS232C to PC Socket 2
UPLOAD Begins to upload data to PC. Screens similar to those shown below will
appear, and during uploading the #IDENT will increment.
EXIT Returns to LOGGING MENU. Refer to Section 4.6.
When data uploading is finished, the following screen appears, showing the #IDENT of the last record to be
uploaded.
EXIT Returns to LOGGING MENU. Refer to Section 4.6.
EXTRACT DATA
UPLOAD> >>
PLEASE CONNECT PC
EX I T>>>
UPLOAD I NG DATA
#IDENT FFFR
F I N I SHED UPLOAD I NG DATA
#IDENT FFFR
EX I T>>>

801 Operation Manual Page 16
4.7. SUB OPTIONS Menu
Selecting SUB OPTIONS from the OPTIONS MENU reveals one of the following displays.
i] If Frequency or Alarm outputs not fitted [Factory option]
ii] If Frequency or Alarm outputs fitted [Factory option]
SUB OPT I ONS MENU
DIRECT EM COMMS>>>
EX I T>>>
SUB OPT I ONS MENU
<<< INCREASE 100Hz 1KHz 5KHz 10KHz>>>
< < <DECREASE D I RECT EM COMMS> > >
<<<HI ALARM +1 . 2 LO ALARM +0 . 3 EX I T>>>

801 Operation Manual Page 17
4.8. Analogue output [factory fit option]
The analogue output is factory set to provide +/- 5v for the range +/- 5 m/s. The voltage is derived from a D/A
from the last updated average velocity figure.
The analogue output is made available from a connector which is part of a Y lead which has both analogue out
and DC power in. A mating 6 way connector [LMH 06F 10 06 PN] is provided to enable users to terminate their
own cable to this connector.
Connection details of the Y cable are:
CDU end Function Analogue output
10 way in-line Male MilSpec
connector
LMH 06F 12 10 PN [pins]
6 way Female Milspec
connector
LMH 00F 10 06 SN [sockets]
Pin A Signal Ground Socket A
Pin B Signal Socket B
DC power in
3 way Male Milspec connector
LMH 00F 08 33 PN [pins]
Pin G Power +ve Pin A
Pin H Power -ve Pin B*
Pin K Power sense Pin C*
* These two are connected together in the mating connector. This “senses” that external DC is being applied.

801 Operation Manual Page 18
5. POWER SUPPLY
5.1. Changing batteries
The 8 “C” cells are housed in the battery compartment in the bottom of the CDU. Access is gained by unscrewing
the central retaining screw and pulling out the end cap and pcb assembly. The cells can then be removed. When
putting in new cells, be careful to ensure they are inserted the correct way. Labels are located in the compartment
to indicate the correct way [note the large springs touch the -ve end on each cell, small springs the +ve end].
5.2. Battery Life
The current consumption of the units is as follows [all measured at 10vDC]:
Backlight On Backlight Off
Standby 92 mA 33 mA
Run 229 mA 171 mA
The battery life, based on good quality alkaline cells, operating at approximately 15 degC [note performance can
reduce with low temperatures] and working on a duty cycle of 5 minutes On / 1 minute Standby is as follows:
Elapsed
time
Elapsed
time Low
Battery to
stop
Actual
on time
On time
LB to
stop
%
Duration
to low
battery
Hours Hours Hours Hours
Backlight off
Duration to low battery 34.00 28.33
Duration to stop 37.50 3.50 31.25 2.91 91%
Backlight on
Duration to low battery 20.50 17.08
Duration to stop 27.50 7.00 22.92 5.82 75%
If the unit is left in standby, and if no button has been pressed for 5 minutes, the beeper emits 5 beeps to remind
the user that the unit is still switched on. This feature does not operate when the CDU is connected to a PC for
communications such as downloading data.
5.3. External power [factory fit option]
The unit will operate on an input voltage range of 7 to 15 vDC. The optional External DC power cable has 4mm
plugs [Red +ve, Black -ve]. If these are connected using the wrong polarity, an internal fuse will blow. Refer to
factory for instructions for repair.
The External DC power cable connection details are:
CDU end Function Free End
3 way in-line Male MilSpec connector
[LMH06F 08 33 SN] [sockets]
4mm “banana” plugs
Pin A +ve Red
Pin B -ve Black

801 Operation Manual Page 19
6. CALIBRATION
Selecting DIRECT EM COMMS at the OPTIONS MENU enables the user, using a PC in terminal mode via the
optional DC data lead to read and alter the EM calibration.
Connect the unit to a PC via the data interface lead supplied. Connection details are given in Section 4.6.3.
Run a terminal emulation program on the PC, ensuring that communications are correctly set to 4800 baud, 8 data
bits, 1 stop bit, no parity bits, flow control NONE.
The EM calibration has 3 parts to it:
HYDRO CAL This is the “shape” of the calibration curve and for normal routine
calibrations the same calibration is used for all units of the same type.
SYSTEM GAIN FACTOR The Gain Factor is specific to a combination of sensor and CDU, and is
the factor by which all raw data from the electronics are multiplied to
normalise the data to a standard counts per metre/sec.
SYSTEM ZERO OFFSET The Zero Offset is specific to a combination of sensor and CDU, and the
number of counts which the unit outputs at zero flow.
Having connected up the CDU and PC and entered DIRECT EM COMMS, the unit will output EM data at a rate
of 2 Hz. Calibrated data from the EM electronics is in mm/sec. To communicate to the unit and interrupt it, press
the “#” key on the PC followed by <cr>. The unit will respond with a “↔” and then await a command. These
commands are a series of “#” codes
Code Followed By space and Operation
#007 Output_Format<cr> Sets the output format of the unit to Cal or Nocal. Cal is
data in calibrated units, Nocal is raw counts and is used
for calibrating purposes
#028 Nothing<cr> Sets the unit into run mode. Data is outputted at the
2Hz rate.
#170 X_Gain_offset<cr> Sets the zero offset for channel X in counts
#172 Nothing<cr> Reads the zero offset for channel X which has been set
#174 X_Gain_Factor<cr> Sets the GAIN_FACTOR for channel X
#176 Nothing<cr> Reads the GAIN_FACTOR for channel X which has
been set
#190 Nothing<cr> Reads the Hydro Calibration for the X axis which has
been set
#192 X_Axis_Calibration<cr> Sets the X Axis Hydro Calibration
Note that the X axis referred to in the above table relates to the single axis used on the 801. If the user wishes to
alter the calibration from the factory setting, they will be required to enter the calibration coefficients. The
calibration coefficients are stored within the microcontroller in an ASCII text string. The format of this string
depends on the type of calibration (line fit or polynomial fit). The first part of the string will be the calibration
function number, selected from the table below, which defines the type of fit.
Calibration
Function No.
OPERATION
0Not defined
1One straight line fit
2Two straight line fit
3Three straight line fit
4Four straight line fit
5Five straight line fit
The calibration takes the A/D counts, and calculates the engineering value from calibration coefficients. In all
cases it is assumed that the –ve and +ve flow characteristics are the same.

801 Operation Manual Page 20
Thus, for example, a three line fit calibration will be entered in the format shown below (note the single space
between each value):
3 Coefficient1 Offset1 Max_lt1 Coefficient2 Offset2 Max_lt2 Coefficient3 Offset3 Max_limit3<cr>
The offset is the y axis [engineering value output] intercept at zero counts for the straight line segment
The coefficient is the slope of the straight line in engineering units per count.
The limit is the number of counts up to which the straight line is to be used [must be a positive number]
Where Max_lt is the range up to but not including, which the straight line operates over.
The first straight line starts from 0 up to Max_lt1 in A/D counts (WHOLE numbers).
The second straight line starts from Max_lt1 and including it up to Max_lt2 but not including it.
The Third straight line starts from Max_lt2 and including it , up to Max_lt3 but not including it.
The last line limit [e.g. Max_lt3 in the example above must be set to more than the maximum number of counts,
and Valeport usually use the figure 40000.