OPERATION MANUAL
RHEONIK
MASS FLOW METER
March 1999, REV. F
RHEONIK Messgeräte GmbH
Rudolf-Diesel-Str. 5
D-85235 Odelzhausen
Tel. 08134 / 9341-0
Fax. 08134 / 9341-41
Mail@rheonik.de
Web: www.rheonik.de
RHEONIK Messgeräte GmbH
REV F, March 1999
TABLE OF CONTENTS
page
1. MOUNTING AND INSTALLATION INSTRUCTIONS
3
1.1. GENERAL SYSTEM DESCRIPTION
3
1.2 MOUNTING INSTRUCTIONS SENSOR RHM ..
4
NOTES FOR LOW TEMPERATURE USE ( BELOW 0°C )
6
1.3. SENSOR RHM.. WIRING
7
1.4. MOUNTING INSTRUCTIONS RHE FLOW TRANSMITTER
8
1.5. POWER SUPPLY WIRING
8
2. PROGRAMMING AND OPERATING
2.1. GENERAL INTRODUCTION
2.1.1. KEYBOARD AND DISPLAY
2.1.2. BASIC OPERATING AND PROGRAMMING PRINCIPLE
2.1.3. BASIC LEVEL USER MENUS
2.1.3.1. ZERO CALIBRATION
2.1.3.2 RESET TOTALIZER
2.1.3.3. DISPLAY UNITS
2.1.3.4. DISPLAY SEQUENCE AND FORMAT
2.1.3.5. INPUTS AND OUTPUTS
2.1.3.5.1. CURRENT #1 and #2 OUTPUT
2.1.3.5.2. ANALOG INPUT
2.1.3.6. DIGITAL INPUTS AND OUTPUTS
2.1.3.6.1. FREQUENCY OUTPUT
2.1.3.6.2. SERIAL COMMUNICATION
2.1.3.6.3. INPUTS FROM EXTERNAL CONTACT CLOSURES
2.1.3.6.4. CONTACT OUTPUTS
2.1.4. HIGH LEVEL SETUP, PARAMETER SETUP, DIAGNOSTICS
2.1.4.1. DIAGNOSTICS MENU
2.1.4.1.2. SENSOR DIAGNOSTICS
2.1.4.1.3. SENSOR BASIC LEVEL PROGRAMMING
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3. ERROR CODES
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4. WARNINGS
22
5. TROUBLE-SHOOTING GUIDE
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5.1. SENSOR VOLTAGES AND RESISTANCES
22
5.2. TEMPERATURE CALIBRATION
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6. REPLACEMENT PARTS
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7. ADDER FOR OPTION CODE BATCH
26
APPENDIX:
RHM-RHE WIRING DIAGRAM
RHE BASIC LEVEL USER MENU
RHE SERVICE AND DIAGNOSTIC LEVEL MENU
BATCH MENU (OPTION)
EC DECLARATION OF CONFORMITY
1. MOUNTING AND INSTALLATION INSTRUCTIONS
1.1. GENERAL SYSTEM DESCRIPTION
The RHEONIK massflowmeter consists of one of the RHM .. series flow sensors and one
RHE series transmitter. The remote unit RHE is for installation in the safe area and is
connected to the transmitter via a single multi-conductor cable. Ex-series sensors RHM .. are
for installation inside hazardous areas.
The transmitter RHE .. includes seven printed boards which can be replaced during servicing.
1) Power Supply
The power supply converts 115/230 VAC or 20..30 VDC input to some DC voltage outputs.
The power supply generates regulated 6 Volt power to the digital circuits, +/- 15 Volt outputs
to the amplifier board and an isolated 30 Volt output for the 0/4 - 20 mA current loops of the
output board.
2) Amplifier Board
This board amplifies and filters the flow and temperature output signals of the sensor RHM ..
and converts them into digital signals for the microprocessor reading.
Also this board provides drive excitation to the RHM .. series flow sensor.
3) Processor Board
Heart of this board is a high speed microcontroller. It converts the digital signals from the
amplifier board into massflow, volumetric, density or temperature information to be output on
different digital and analog outputs (LCD display, frequency output, 0/4 - 20 mA output, limit
outputs, serial communication ports).
4) I/O Board
All input and output signals to external devices (PLC, recorders,..) go through this board. All
inputs and outputs, also the current loop outputs, are galvanically isolated.
5) Safety Board
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This board is included in Ex-series transmitters RHM .. and provides an intrinsically safe
design, so permitting the sensor RHM .. to be installed in certain hazardous areas.
6) Display Board
The display board provides a digital indication of different measurement data displays as flow
rate, flow totalization, temperature, density.
It is a dual line LCD display with 16 characters per line. The character height is 8 mm.
Also all digital programming can be done using the display menu system in combination with
3 push-button keys.
7) Motherboard
This board is mounted inside the transmitter housing and is the interface board between the
single boards mentioned above. All single boards are plugged to the motherboard by using
DIN connectors and can be easily replaced therefore.
1.2 MOUNTING INSTRUCTIONS SENSOR RHM ..
For liquids locate the sensor RHM .. at lowest practical level in your pipe line system. The
sensor must be filled with liquid all the time while operating.
Sensor and cable must be located as far as possible from sources of electrical noise
(transformers, high voltage power switches, large electrical motors).
Installation example:
RHM..
Avoid connecting the sensor directly to the process pump. The piping system must be as free
of vibration as possible. Normal plant vibration has no effect on meter performance. However
do not mount the sensor in areas having abnormally high vibration.
Install the sensor in horizontal position with hanging twin loops for liquid measurement (see
the following sketch) and opposite for gas measurement.
Sensor
Hydraulic
Connector
Shut Off Valve
Flexible Tubing
Flow
Flow
Pipe Support
Terminal
Box
Pipe Support
Sensor Wiring
Sensor Support
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The first position helps to remove gas bubbles out from the meter tubes, the second prevents
condensate collection. In order to remove gas bubbles during start-up, flushing with relatively
high flow rate for some minutes is recommended.
Do install the piping close to the hydraulic meter connector in between two supports
according to above sketch. Preferably use only rigid pipes in the system.
Avoid abrupt pipeline reducers. They can cause cavitation or flashing inside the meter tubes.
Mount reducers outside the rigid pipe supports.
For sensor sizes RHM 30, 40, 60, 80 straight pipe running before and after the sensor are
required. There should be no valves, reducers or pipe unions inbetween the pipe supports
and the sensor.
For liquids in a low flow range of 5 - 30 % of meter full scale, install sensors RHM 40, 60,
and 80 or bigger in almost horizontal position (housing almost parallel to bottom). For this
installation, the housing flanges can be used for connection to housing supports.
pipe support
10-20°
meter support
Please remove the transportation fixation screw before start-up. Please find enclosed a
drawing of a RHM.. (dimensions can be found in our datasheets).
Laid length
PG 13.5
PG 16.5 ( blind )
Hight
Attention: Remove
fopAttn.: transport
transportation
icherung
vor Inbefixation screw
scretriebnahme
( for RHM <= 30 )
If you are connecting flexible tubing or hose directly to the sensor please use sensor housing
flanges for rigid sensor mounting.
Use a high quality valve downstream from the sensor for proper zero point calibration. For
sensor sizes RHM 007, 01 and 03 two valves, upstream and downstream, are recommended.
For RHM 007, 015, 01, 03, 04 G (R 1/4") the tubing has to be considered as flexible, because
the tube diameter is relatively low, and therefore this meter sizes have to be fixed at the
connection block in addition. For this reason we can supply a mounting skid made of
aluminium, in order to achieve an optimum of stability with low installation time and costs.
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For best performance please use metal installation supports for the tubing or two plastic
supports at each side of the sensor for tube mounting.
Mouting skid for wall
mounting
Fixation screw
Connection block
Sensor RHM..
Wall or rigid skid
NOTES FOR HIGH TEMPERATURE USE (RHM ET and .. HT
TYPE)
Installation: Avoid in any case heavy accelerations or mechanical shocks on the instrument.
The instrument has to be isolated in such manner, that levels of different temperature within
the instrument can be avoided. Use exclusively cables corresponding to the temperature
range of sensor terminal box and surroundings ( terminal box is extended ).
Heat up: The instrument has to be heated up slowly, that in any case the temperature
difference within the instrument cannot surpass a delta of about 50°C. Heating up with
constantly 1°C per second is the maximum that is permitted. This means that if you are able
to heat up with constant velocity, it would take at least 1 minute to heat up from f.e. 30°C to
90°C. It is recommended for a long lifetime of the meter to minimize the heating up cycles by
keeping the meter always at high temperature ( with a heating system ) as good as possible.
For meter sizes <= RHM08 it is recommended not to have more than about 50 heating up or
down cycles in total, for bigger meter sizes the number of cycles may be higher !!
Filling with medium: Before it can be filled with the hot medium, the instrument must have
a minimum temperature of 50°C below the temperature of the medium. The temperature of
the instrument can easily be checked at the RHE.. temperature indication. Please note:
Heavy temperature shocks may damage the instrument totally !!
Example: medium 350°C - instrument 310°C is o.k..
Cleaning: For cleaning purposes temperature shocks have to be avoided in any case.
Please work within the limits as above described.
NOTES FOR LOW TEMPERATURE USE ( BELOW 0°C )
All the recommendations regarding temperature shock are valid as well as for high
temperatures.
After using a meter ( with sealing ) the first time at low temperature, you have to
tighten again the connector screws in order to prevent any leakage !
Please note: If you do not tighten the screws, the leaking meter can cause a big
damage !
After the first shrinking and you tightened the screws, no further precautions are necessary.
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1.3. SENSOR RHM.. WIRING
The sensor RHM .. is connected to a RHM.. transmitter using a cable having four pair of
shielded wires plus 1 wire (9 wires).
The normal distance between sensor and transmitter is up to 200 m. For distances up to 500
meters please ask the manufacturer.
Use cable supplied by RHEONIK being suitable for the sensor terminal box temperature
range.
Use instrumentation cable channels for cable installation to the remote electronic unit far
from high current motor cables. Avoid routing wiring to external customer equipment, motors,
strong magnetic fields or sources of electrical noise.
Make sure that the bare cable shields have insulation preventing them from shorting out from
contact with the transmitter housing, sensor enclosure, conduit or other parts.
One shield wire has to be used for connection of RHM terminal #3 (see attached wiring
diagram).
A ground screw is provided inside the sensor terminal box and should be connected to a
known earth ground, if there is no other ground connection outside on the meter housing.
Specifications of the RHEONIK furnished cable:
- Normal temperature range (static: -20°C .. + 70°C):
SLI2Y (ST) Y (4 * (2 * (2 * 0,5mm²) + 1 * 0,5mm²)
4 pairs, each pair individually shielded, plus 1 wire and 1 overall shield (wire tinned copper
(7*0,3mm).Twisted pairs covered by aluminium polyester foil insulation. Wire colors whitebrown, green-yellow, grey-pink, blue-red and orange. Outside jacket color light blue (AD 10,2
+- 0,4 mm).
- Extended temperature range (- 20 °C .. +210°C):
Almost same specifications as normal temperature cable except insulation material: TEFLON
(only 8 wires - shield has to be used as 1 wire). Outside jacket color blue.
NOTES FOR RHM TYPE ..HT
For all RHM type HT (with ceramic isolated wire) an additional connection wire has to be
installed between ground of sensor RHM .. HT and remote unit RHE.. and set to known
ground in order to assure the same ground level for RHM HT and RHE.. .
RHE
ground
terminal
RHM
ground
( see also wiring diagram )
NOTES FOR INTRINSICALLY SAFE INSTALLATION:
Only equipment with safety agency labels attatched to the sensor and transmitter
meet the agency approval requirements.
Intrinsically safe flowmeters must be installed according to the wiring diagram,
supplied with the meter.
Consider proper earth ground wiring according to this diagram.
Sensor cable must be suitable for the sensor operating temperature range.
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All intrinsically safe cables must be separated from all other cables.
Consider temperature class and maximum allowable sensor temperature, indicated on
sensor type label, for safe operation.
All electrical installations must comply with national and local codes.
1.4. MOUNTING INSTRUCTIONS RHE FLOW TRANSMITTER
Mount the RHE unit in an area where the ambient temperature falls within the range -10°C ..
+40°C. For installations outside this range please consult factory.
Locations with extreme vibrations must be avoided.
Do not locate the flow transmitter in direct sunlight.
Sensor RHM and transmitter RHE were calibrated together at the factory.
Therefore make sure that the serial numbers of connected systems comply with
serial numbers indicated on instrument type labels.
1.5. POWER SUPPLY WIRING
The transmitter is delivered set up for 220/230 VAC, 100/115 VAC, 20 to 30 VDC power
input.
The power supply must be turned off while wiring to the remote unit RHE ...
Power supply voltage must agree with the voltage indicated on electronic type label or in the
power supply wiring compartment.
Power supply earth ground must be connected to the RHE .. power supply wiring section.
Failure to connect earth ground will nullify the intrinsic safety.
2. PROGRAMMING AND OPERATING
This section covers the operation and parameter setup of RHEONIK RHE .. transmitters and
model RHM .. massflow sensor.
The subjects are:
1. Display and keyboard handler
2. Basic transmitter setup (inputs,outputs, zeroing)
3. High level setup (sensor setup, passwords, diagnostics)
2.1. GENERAL INTRODUCTION
When turning on the remote unit RHE or when causing a system reset the display will show
the software version number. The unit runs an automatic diagnostic program to determine if
both sensor and electronics are free of malfunctions. After the diagnostics have been
completed satisfactorily or if the flowmeter is in operation, the LCD-display will show a
measurement display.
2.1.1. KEYBOARD AND DISPLAY
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The display is a dual line 16 character liquid crystal display (LCD). The keyboard consists of
3 keys.
For LCD contrast adjustment a 270° angle trimpot is installed on the back side of the 19"
housing.
If the display characters do not appear or there is poor readibility, turn this trimpot slowly
from the factory set position until chracters just start to appear on display.
Display symbols in the measuring mode with explanation:
← →
:
Flow direction (direction not fixed, forward / backward)
A
:
Flow rate > recommended range
∨
:
Flow rate < recommended range
:
Flow rate < low flow cutoff limit
*
LCD DISPLAY
KEY #1
KEY #2
KEY #3
If no button is touched the unit will sequence into the measurement data display. The current
mass totalizer and flow rate will appear.
Pressing key #3 scrolls you through the measurement data display.
2.1.2. BASIC OPERATING AND PROGRAMMING PRINCIPLE
The display gives the guideline by itself. If you want to enter any menu you have to press the
button below the displayed menu point.
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Select
Select
Select
Menu#1
Menu#2
Menu#3
For programming numbers you have to press + and - buttons to increment or decrement the
displayed number. With NEXT you will enter the next menu point. Following the NEXTfunction you will be guided back into the measurement data display.
DECREMENT
INCREMENT
STEP TO
NUMBER
NUMBER
NEXT MENU
For complete menu system please have a look at the menu flow chart.
2.1.3. BASIC LEVEL USER MENUS
This section gives a short description of all functions of programming the user needs in order
to setup all inputs and outputs according to his demands.
2.1.3.1. ZERO CALIBRATION
Zero calibration is done when:
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1) the meter has just been installed, or
2) drastic piping or fluid changes have occurred, or
3) meter operating temperature has changed to a much higher or lower new level.
Before starting a zero calibration, make sure that the sensor RHM .. is installed and wired
correctly according to the wiring section of your installation manual. Follow these steps to
calibrate meter zero point:
1) Power the remote unit RHE at least half an hour after initial installation and prior the
zeroing.
2) If possible run the fluid through the sensor RHM.. for about 10 minutes to establish normal
operating conditions.
3) Stop the fluid flow through the sensor with a downstream valve. Meter tubes must remain
full of fluid and contain no air or entrapped gas. Even small amounts of flow will cause an
inaccurate zero point calibration.
4) Step through the measurement data display by pressing key #3 until you can enter the
zeroing menu.
5) Start the zero calibration process by pressing the zero key.
While the unit is zeroing for about 20 seconds ZEROING ACTIVE is being displayed. After
the zeroing, EXIT is displayed.
NOTE: If you want to recover the zeropoint before the new zero calibration (for example
wrong zeroing) you just have to activate the UNDO key before leaving the zero calibration
menu. After this, the old zeropoint will be valid again.
2.1.3.2 RESET TOTALIZER
This menu point is enterred similarly to zero calibration. By pressing the RESET key the
current totalizer is set to zero. Activating the UNDO function before leaving the RESET menu
will give back the old totalizer value before RESET.
2.1.3.3. DISPLAY UNITS
You can choose between SI-units (European standard) or ANSI units (US-standard).
NOTE: With ordered option density measurement you can select volumetric units instead of
gravimetric.
Units for each parameter will rotate through the available options depending the selected + or
- key. Standard units for each parameter are:
Total mass:
Mass flow :
t, kg, g
t,kg,g / h, min, sec
tn, lb, oz
tn, lb, oz / h, min, sec
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Density:
kg/l (=kg/dm3)
lb/ga, BaumeL, BaumeH, kg/l a *)
Temperature:
°C
°F
Total volumetric:
m3, l, ml
ga, ba, in3
The selection may be changed as often as desired and will be held in non volatile EEPROM
memory.
NOTE: *) This density unit is referenced to a specific temperature (density at reference
temperature).
2.1.3.4. DISPLAY SEQUENCE AND FORMAT
In order to determine the sequence of different measurement data displays you have to
program first, second , .. display function (1.Disp = XXXXX).
In TOGGLE mode the LCD display is being switched every 10 seconds to another possible
measurement data display (Disp = Toggle).
Totalizer increment resolution is selected in total format display (TotalForm=X.XX). Consider
the maximum totalizer of 8 digits! Totalizer overflow will be indicated.
With Show Errors=off no error messages will be indicated on display.
After Lock Keys=on the keyboard will be blocked until next power OFF and ON.
2.1.3.5. INPUTS AND OUTPUTS
2.1.3.5.1. CURRENT #1 and #2 OUTPUT
First select the variable to be output on channel #1 or #2 from among the following (press +
or - button):
20mA OutX1=XXXX
- Flow
- Temperature
- Density *)
- % Solids *)
- % Concentration *)
Second select life zero (4 mA) or not for selected channel.
There are 3 modes for 4 - 20 mA output (20mAOut1=4-20mA):
1) 4 - 20 mA: The output signal range is in between 4 - 20 mA. Output error status is 2 mA.
2) 3.7-20 mA: Output signal range is in between 3.7 - 20 mA. Output error status is less than
3.7 mA.
3) 4 - 22 mA: Output signal range is in between 4 - 22 mA. Output error status is above 22
mA.
After this you are shown the first of two displays to scale the output. The first display enables
you to select the high numerical value of the variable that will be represented by 20 mA of
current (20mA=XXXXX).
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Change that value by pressing + or - push-buttons.
After the 20 mA value, you are shown a display to select the low value of the variable to
correspond to either 0 or 4 mA of current, depending on the option you selected previously.
Scale the output similarily to the 20 mA value (0 mA = XXXX).
After pressing the next button the analog output display is shown to enable you to configure
the channel #2 output. All setting procedures are the same as for channel #1.
2.1.3.5.2. ANALOG INPUT
The next menu points after the 20 mA output scaling are the analog input configurations.
First you have to select the variable units to be input at voltage input (0/1- 5 Volt).
You can choose from among the following:
V, mA, kg/l, °C, ml/min, m3/min, bar, bara, psi, mPas.
After next you have to determine the input signal range 1- 5 Volts or 0 - 5 Volts. Next you
have to input the high and low numerical values of the variable that will be represented by
either 5 or 0/1 V.
NOTE: For use as current loop input you have to connect a resistor of 250 Ohm.
250 Ohm
0/4 - 20 mA
Current Source
2.1.3.6. DIGITAL INPUTS AND OUTPUTS
2.1.3.6.1. FREQUENCY OUTPUT
In the first display you have to choose the technique that will be used to scale the frequency
output.
Mode 1: Pulse Output. If you choose FreqOut = Pulse the next display will show the
current number of pulse per volumetric or mass units. If you wish to change this you can
enter the number of pulses in power of 10 by using the + or - push-buttons (1, 10, 100 ..
pulses / g or kg or t).
Mode2: Frequency Output. In this mode the display will show the flow proportional
frequency of 5 kHz. The numerical value of flow rate that will be represented by a frequency
of 5 kHz will be changed by using the + and - function. The whole output frequency range is
0 to 10 kHz.
The frequency output is available from an opto isolated open collector driver. For wiring see
attached RHM-RHE-wiring diagram.
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R
DC Voltage
max. 30 V
Opto Isolator
User' s
Equipment
NOTE: The open collector output can sink up to 50 mA of current. Typical supply voltage 5
.. 30 VDC.
2.1.3.6.2. SERIAL COMMUNICATION
The RHE remote electronic unit supports either RS422 / 485 full duplex (4 wire system)
interface. TTL level serial can also be used. Transmission baudrate can be set in baudrate
menu (300, 600, 1200, 2400, 4800, 9600, 19200 bits/second).
The serial interface can be used in a bus (4 wire). For this purpose each remote unite has to
be adressed separately.
For RS422/485 connect communications wiring pairs to the TX+/TX- pair terminals and to
RX+ /RX- receive air terminals for 4 wire installations (see attatched wiring diagram).
Standard character format is:
7 bit ASCII, 1 start bit, 1 stop bit, parity bit EVEN.
For network communication each transmitter RHE has to have its own network address
from A to Z.
Basic Command Format:
Commands are sent by the computer to the transmitter. The message protocol uses only
ASCII characters as follows:
- Commandhead:
<7F><7F><#>[<address>]
Address is any character ´A´ to ´Z´. If the transmitter has no address, no address character
must be transmitted. If ´$´ is transmitted as an address this character is valid as master
address. All transmitters of a network are reacting on this request.
- Request Instruction:
If there is any of below listed request instruction transmitted after the command head, the
transmitter will send the requested information.
request for
command
transmitter RHE reply
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flow rate
totalizer
temperature
density*)
non res. total.
analog input
error message **)
warning **)
REV F, March 1999
f?
q?
t?
d?
m?
a?
e?
w?
f=...
q=...
t=...
d=...
m=...
a=...
e=...
w=...
f=_1.987kg/min
q=____413.4lb
t=-_12.4C
d= 16.435lb/gal
m=___36782kg
a=_10.16bar
se=3F
ws=5
*) Only with option density measurement.
**) error and warning code in HEX
- Command Termination:
<CR><LF><7F><7F>
CR: carriage return
LF: line feed
- Commands without measurement data request:
There are also some commands to be sent to the transmitter without request for special
measurement data.
These commands must be sent like the request instructions within the comand head and
command termination:
instruction
command
RESET totalizer
HOLD ON totalizer
HOLD OFF totalizer
CLEAR ERROR
hon
hoff
c
transmitter reply message
r
r
hon
hoff
c
2.1.3.6.3. INPUTS FROM EXTERNAL CONTACT CLOSURES
The RHE electronic offers two possible inputs. Both are galvanically isolated and are
passive, this means to activate the inputs the opto isolators LED´s have to be driven by an
external support voltage of maximum 30 VDC (R = 2700 Ohm).
R
DC Voltage
max. 30 V
Opto Isolator
External
Contact
Input
(Switch, Relay, ..)
Both inputs can be programmed by software keys as:
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- RESET totalizer
- HOLD
totalizer
- ZERO
calibration
- QUIT
error
- NOT USED
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(set totalizer to zero)
(block totalizer counting during flow)
(start zero calibration procedure)
(quit error message)
(switch OFF, input not used)
NOTE:
- Care should be taken to ensure that the flow has been stopped before using the input as
remote zeroing input.
- Using the RESET function the input can be used to start a batching process in combination
with totalizer limit outputs.
- Without installed I/O board inside the transmitter RHM the input function has to be
programmed as NOT USED.
2.1.3.6.4. CONTACT OUTPUTS
The output hardware is the same as for frequency output (see section 2.1.3.6.1.). All outputs
can be programmed to one function as follows:
-LIMIT FLOW, TEMP, DENS:
Flow rate, temperature or density limit. The output is active below the adjusted setting.
-LIMIT MASS:
Mass totalizer limit. The output is active below the adjusted totalizer value.
-ERROR:
Output is activated when a malfunction in the flowmeter is detected.
-FLOW DIREC:
Flow direction output. Output is active in one flow direction and passive in the opposite.
-EMPTY TUBE:
Empty tube signal active with no liquid inside the meter tubes.
Attention: In all cases, the maximum current sinking capability of each output line is
50 mA of current.
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Configuration of the digital outputs:
Output
Status
active open
active clsd
selectable*
limit flow
> value
closed.
open
yes
limit temp
> value
closed
open
yes
limit dens
> value
closed
open
yes
limit mass
> value
closed
open
yes
Error Indication
open at error- at normal operation closed
Flow direction
< >
flowdirection +/-
Emty tube indic.
> 300 kg/m³ closed
(only active with option density measurement !)
no
no
open
yes
* if yes is shown under selectable, you can choose in a separate menu point between
out active open
or
out active clsd (closed).
All outputs can be selected in one in the same direction only !
digital output circuit switching valves (example):
Electrically
operated
Valve
120 or
230V AC
Relay
1N4002
DC Voltage
max. 30 V
Opto Isolator
2.1.4. HIGH LEVEL SETUP, PARAMETER SETUP, DIAGNOSTICS
This menu will only be displayed after key #2 and #3 have been pressed simultaneously. The
menu has two options:
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- Diagnostics (sensor, I/O hardware)
- Basic level parameter setup (sensor parameters, digital filtering, calibration settings,
corrections)
It contains items that alter calibration parameters and items that reconfigure the electronics
to perform different functions.
2.1.4.1. DIAGNOSTICS MENU
This menu has two options:
1) Set I/O to a certain status or level.
2) Show current I/O status.
For example in SET mode you can set the mA output to a certain current to compare the
setpoint with a digital mA meter connected to the output terminals.
In SHOW mode you can see the actual mA value the output should have at a certain flow
rate, temperature or density indication.
2.1.4.1.2. SENSOR DIAGNOSTICS
This function is helpful for start-up checking or for testing sensor malfunctions.
The single diagnostic displays are:
- FREQ:
Sensor oscillation frequency in XXX.XXX Hz. With proper installation, constant fluid density
and no electrical interference this value should vary only at the second decimal after the
point.
- GATE 1:
Phase shift timer #1 counts.
- GATE 2:
Phase shift timer #2 counts. The actual phase shift corresponding to massflow rate is
calculated from the difference of GATE #1 and #2 value.
- DIFF:
Difference: GATE # 1 - GATE # 2
- d:
Zero phase shift (zero point) and actual phase shift.
- AD-Channel1 #1:
Analog input channel #1 value (12 bit, 0 - 1023).
- AD-Channel #2:
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- Run Time:
Electronic run time counter in days and hours.
- Mass:
Second, non resettable totalizer.
2.1.4.1.3. SENSOR BASIC LEVEL PROGRAMMING
To enter this menu you have to input the password.
The password is:
- Press 3 times key #1
- Press 2 times key #2
- Press 1 time key #3
After pressing a key an asterisk * is being displayed.
Inside this menu you have to enter sensor specific data like meter size, meter twin loop
connection (serial or parallel) and maximum sensor operating temperature.
Next there are settings for special operating conditions like:
- Filt Array:
Digital low pass filter for phase shift measurement. Filt Array number is equal to number of
filtered measurement cycles. Shortest measurement cycle time is two sensor oscillations.
This filter is very usefull for applications with pulsating flow rates (piston pumps).
- TFlow:
Digital damping value for display and analog outputs (flow rate). TFlow is response time in
X.XX seconds.
- FiltBand:
Flow rate filter band in percentage of maximum sensor flow rate (range 1: 20). Response
time outside filter band is shortest. Inside adjusted response time TFlow is active.
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- CutLimit:
Low flow indication cutoff in percentage of max. flow rate. Valid for digital flow rate display
and totalization.
- DensCutoff:
Density cutoff for flow rate indication and totalization. For applications where the liquid is
removed by gas stream out of the pipeline but the meter should not count the gas stream.
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3. ERROR CODES
The internal microcontroller continually monitors several voltages, signals and functions and
checks proper operation of the sensor-transmitter system.
If an error occurs, a fault code is being displayed on the transmitter display. Error codes
following to the power-up, after initial installation are usually caused by incorrect electrical
wiring or inproper flow sensor installation (f. e. sensor tubes not totally filled with liquid).
A transmitter working with no flow sensor will indicate error code nuber 2 (ERR 2).
Possible error codes are:
Code
Display
Description
Err 1
Drive
Drive signal error. Drive gain amplifier gives maximum possible
power. Possible reasons: - drive coil (term 1 - 2) defective
-extreme unbalanced vibrating sensor system (big gas bubbles)
Drive level is compared with level adjusted by trimpot P3 on
amplifier board.
Err 2
Pickup
No sensor coil1 or 2 signal is detected.
Possible reasons:
- the wiring is incorrect
- one or both coils defective
- defective component on safety or amplifier
board
Check sensor and wiring according trouble-shooting section.
Err 3
Temperature
The temperature detected by the RTD inside the sensor RHM is out
of range (-154 .. 360 °C) or temperature is above maximum
allowable operating temperature, adjusted in MaxTemp menu.
Possible reasons:
- RTD defective or circuit open or shortened
- defective component on safety or amplifier
board
- defective analog to digital converter inside
- microcontroller or defective voltage
- reference (component U7 or U9).
- temperature measurement not properly
calibrated,
For calibration see next section.
Err 4
Parameter
Error on parameter ckeck. Error occurred during parameter
transfer from EEProm to RAM memory. Calculated checksum
is different from backuped checksum. Replace EEProm on
microprocessor board (component U3).
Err 5
RAM
Error on RAM check. Defective storage cell detected. Replace
RAM memory on microcontroller board (component U4).
Err 6
ROM
Error on ROM check. Calculated checksum is different from
programmed checksum. Defective EPROM storage cell.
Replace EPROM. Replace EPROM on microcontroller board
(component U6).
Err 7
EEProm
No EEProm reading or writing possible. Replace defective
EEProm on microcontroller board (component U3).
Err 8
Division
Calibration error. Internal calculation overflow. Verify proper
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calibration parameter setting.
Err 9
Stack
Stack memory too small. Reduce number of measurement
gates in calibration parameter setup (IntGates).
Err 10 A/DChan2
Defective analog input, or input voltage outside range (0 - 5
Volt). Check input voltage or replace defective microcontroller
(analog to digital converter defective, component U7) .
4. WARNINGS
The microprocessor is also indicating warnings. The difference to errors is that warnings are
less dangerous than errors. For example there will be a warning when flow rate is above 100
% sensor flow rate. But it is just a warning that tells you that meter performance could be
reduced in this range, yet hardware and software are working properly.
Code
Display
Description
Warn1
Reset
Power failure occurred, there was a processor reset.
Warn2
FlowRange
Flow rate is above maximum flow rate for this sensor size.
Reduce flow rate to have optimum accuracy.
Warn3
TempRange
Sensor temperature is more than allowable sensor
temperature adjusted in MaxTemp menu.
Reduce sensor temperature, or else the electrical
installations inside the sensor will be damaged.
Warn4
Drive
For a short time there was a lot of damping of the meter
oscillation (may be big gas bubbles).
Warn5
OverflTot
There was a totalizer maximum count overflow, the
totalizer started again at zero.
5. TROUBLE-SHOOTING GUIDE
5.1. SENSOR VOLTAGES AND RESISTANCES
There are four electrical circuits connected to the transmitter RHE .. . The sensor receives
drive excitation from the transmitter and returns two AC Voltage signals back to the
electronics, along with the temperature signal from a RTD temperature sensor.
Using a digital voltmeter the voltages can be checked:
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Terminal
Circuit
Voltage
1
2
3
4
5
6
7
8
9
Drive +
Drive
RTD
RTD
RTD
Coil 1 +
Coil 1
Coil 2 Coil 2 +
0.3 - 7 V AC
(term. 1 - 2)
130 mV DC at 20 °C (term. 3 - 4)
130 mV DC at 20°C (term. 3 - 5)
10 - 150 mV AC (term. 6 - 7)
10 - 150 mV AC (term. 8 - 9)
If the values are within the above limits, the meter is oscillating.
If the measured voltages are not within the ranges shown in the table, disconnect the
transmitter and check the resistances at the sensor RHM .. terminals.
Terminal
Circuit
1
2
3
4
5
6
7
8
9
Drive +
Drive RTD
RTD
RTD
Coil 1 +
Coil 1 Coil 2 Coil 2 +
Resistance
5 - 170 Ohm
(term. 1 - 2)
107 - 109 Ohm at 20 °C (term. 3 - 4)
0 Ohm (short circuit) (term. 4 - 5)
30 - 150 Ohm (term. 6 - 7)
30 - 150 Ohm (term. 8 - 9)
If one of these values is infinite, the sensor RHM .. is defective.
Check insulation resistance to earth ground (sensor RHM .. housing).
If a short circuit between any sensor terminal and sensor housing is measured, the sensor
RHM .. is defective.
If no problems are located at the sensor resistance check Sensor-to-Transmitter wiring for
correct connections and for no shorts or opens, loose conductors or poorly dressed wiring.
NOTE:
- High temperature sensors RHM .. HT need special grounding. Check ground wiring
according to diagram.
- Insulation resistance to earth ground for high temperature sensors is in the range 103 - 106
Ohm.
5.2. TEMPERATURE CALIBRATION
Temperature measurement is already factory calibrated. Normally a new temperature adjust
or new recalibration is not necessary. The RTD is connected by 3 wires, so that the
measurement is just influenced by one wire resistance.
For extreme long cable length there is a software adjust function for compensating the wire
resistance.
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This can be done in the adjust menu. For this the actual temperature must be well known, or
a resistor simulating a certain temperature has to be connected instead of the meter RTD.
Enter the correct temperature and press the adjust push-button. After this procedure the
temperature reading will be ok.
A complete new temperature calibration is performed by:
1) Connect a resistor of 38.0 Ohm, simulating a temperature of -154°C instead of sensor
RTD.
2) Open the front panel of the transmitter.
3) Turn trimpot P1 on amplifier board until the temperature reading is -154 °C. Now the
analog to digital converter must show 0 (sensor diagnostics menu- AD Channel1 0).
4) Connect a resistor of 138.5 Ohm, simulating a temperature of 100 °C.
5) Turn trimpot P4 on amplifier board until the temperature reading is showing 100°C (the
corresponding ADC reading must be: AD Channel1 524).
6) Close the front panel, the calibration is finished, temperature reading by connection of
RTD sensor must be ok within absolute error of temperature mesurement of +-2°C.
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6. REPLACEMENT PARTS
Part Number
Description
NT06
Power Supply (115/230 VAC)
NT07
Power Supply (20.. 30 VDC)
MZ03
Safety Board - Intrinsically Safe
MV03
Amplifier and Signal Conditioning Board
MM03
Processor Board
MIO03
I/O Board
Display
LCD Board
MB07/08
Motherboard RHE 07/08
TR50.2
Fuse 0.2 A
TR51.0
Fuse 1 A
DINCON
Sensor/IO DIN - connector with housing for RHE07
Attention:
For sensor RHM.. for technical reasons only complete RHM can be offered as spare
parts. If you have a sensor RHM.. standard with sealing, the sensor however could be offered
without connector block or flange as spare part.
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7. ADDER FOR OPTION CODE BATCH
( off software version M300998 ver. 1.19 )
RHM..
1. Introduction
With option batch a 1 stage batch process with automatic overflow control, or a 2 stage batch
process without automatic overflow control can be performed. The limit outputs of the
RHE07/08 unit can be used via relais to drive one or two valves. The preset value and the
prewarn value can be set via the menue of the remote unit or via serial interface ( option ). If
automatic overflow control is activated it will automatically after a few batches set the
PWARN value to the correct value in order to have exactly the required batch value ( PSET ).
If you stop during a batch you can decide afterwards to continue ( GoOn ) or to stop the batch
and start a new one ( Clear ). If the power supply is disconnected during a batch, this batch is
stopped and cannot be continued from the last value anymore - a new batch has to be started.
2. Settings in the RHE07/08 software menu ( see also batch menu diagram )
To enter the batch menu the left button has to be pressed, then
BATCH
SETUP
NEXT
appears, if you press
BATCH
you can use the left and middle
pushbutton as
START
STOP
if you press
SETUP
you can configurate the
PSET
value in mass units
and after passing the password the
PWARN
value as well.
The configuration of the digital outputs and inputs has to be done in the standard menu
under
SETUP I/O
=>> DIG
IN1 ( input 1 ) can be configurated as
BATCH START or BATCH STOP
IN2 ( input 2 ) can be configurated as
BATCH START or BATCH STOP
The function of OUT ACTIVE clsd or open has no effect for the batch functions (
always active clsd; the valve has to be closed if there is a power failure on the batch
system PRESET and PREWARN outputs have the status off, if the valves are open, as well
as the ERROR output has the status off, if there is no error ! )
OUT1 ( output 1 ) can be configurated PRESET or PREWARN ( + standard funct. )
OUT2 ( output 2 ) can be configurated PRESET or PREWARN ( + standard funct. )
OUT3 ( output 3 ) can be configurated PRESET or PREWARN ( + standard funct. )
Selection in the options code:
à calibration menu
à <press all 3 pushbuttons>
à display will show "Pass = 0.00000"
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1. Switch off batch function with code "Pass = 0.000005" ( if activated !! )
2. Go out of the menu and start the same procedure with code "Pass = 0.002808"
for
TWO STAGE BATCH function with PRESET and PREWARN without "aoc"
As an alternative you can also:
Go out of the menu and start the same procedure with code "Pass = 0.002809"
for
SINGLE STAGE BATCH function with just PRESET and "aoc" ( PREWARN
automatically set ).
3. Examples with explanation
Example 1: We have a 1 stage batch process (1 batch valve) and want to batch a quantity of
100 kg:
PSET
PWARN
to be set on
to be set on an estimated value depending on the delay time f.e:
100 kg
2 kg
If the option aoc ( automatic overflow control ) is not activated the PWARN value will always
be activated at 98 kg and will close the valve. The PSET output will not be connected to any
valve in this configuration.
If "aoc" will be active the PWARN value will be controlled or optimized automatically in that
way that after some batches the PSET value will be reached.
Example 2: We have a 2 stage batch process with one valve for the main flow and 1 valve for
the small flow. The output for PSET will be connected to the small flow valve and the output
for PWARN to the main flow valve.
PSET
to be set on
100 kg
PWARN
to be set on an estimated value depending on the delay time f.e:
2 kg
The "aoc" can not be activated now !
The main flow valve will close at 98 kg and the small flow valve will close at 100 kg. This
means that still a very small overflow will appear. This can be eliminated by changing the
PSET value to a smaller corresponding value.
3. SERIAL INTERFACE
In addition to the standard serial interface requests and actions there are additional codes that
can be used with option code „batch“ active only.
3.1. Requests
print PRESET value:
print PREWARN value:
7F,7F, ’#’ , <A> , ’BRs’ , ’?’ ,0D,0A,7F,7F
7F,7F, ’#’ , <A> , ’BRw’ , ’?’ ,0D,0A,7F,7F
write PRESET value:
write PREWARN value:
7F,7F, ’#’ , <A> , ’BRsXXXXXXXEE’ , ’?’ ,0D,0A,7F,7F
7F,7F, ’#’ , <A> , ’BRwXXXXXXXEE’ , ’?’ ,0D,0A,7F,7F
X:
EE:
3.1. Actions
batch START:
batch STOP:
‘0’ , ‘1’ ,...’9’ or ‘.’
mass unit characters f.e. ‘kg’
7F,7F, ’#’ , <A> , ’Bst’ , ’?’ ,0D,0A,7F,7F
7F,7F, ’#’ , <A> , ’Bsp’ , ’?’ ,0D,0A,7F,7F
27
28
supply
0V
output
Datum
Bearb.
Gepr.
Heitmeier
Änderung :
15.06.1998
Datum
Bearb.
Gepr.
Not EEx - version : In- and outputs ( terminals 15 to 27 )
are galvanically isolated.
Sensor connections ( terminal 1 - 9 ) are not intrinsically safe.
Remarks :
EEx - version : In- and outputs ( terminals 15 to 27 )
are galvanically isolated.
Sensor connections ( terminals 1 - 9 ) are intrinsically safe.
Erstellt :
SAFE
AREA
9
9
MESSGERÄTE
GMBH
current max. 50 mA
RHE 08
2,7 K
2,7 K
-
-
+
+
26
27
25
24
23
23
21
20
19
18
17
16
15
Out Pwarn ( for relay switching main flow )
Out Pset ( for relay switching small flow )
Intrinsically safe only for EEx - version
+
-
Kunde
Z. - Nr.
Blatt
Projekt
Relay driver stage
Wiring diagram RHE 08 / Batch option
with RHM xx ( configuration example )
14
13
12
11
10
8
8
7
6
6
7
5
5
4
3
4
2
3
HAZARDOUS AREA
( only with option EEx ! )
Only optional available:
Pressure sensor for
special applications
30
PE
1
29
28
-
+
L1
N
2
1
External intrinsically safe
zeroing contact ( option ), is
subject of separate EEx - certificate.
sensor coil 2
sensor coil 1
temperaturesensor PT100
drive
coil
Massflowmetersensor RHM xx
DC
AC
Dee08b05
1/1
+
-
digital input "Batch Stop"
max. 24 V
digital input "Batch Start"
0/4 - 20 mA
current loop 2 ( active )
0/4 - 20 mA
current loop 1 ( active )
common emitter for frequency
and other digital outputs
digital output 1 ( passive )
(f.e. error etc. )
digital output ( passive )
massflowrate
frequency / pulses
RHEONIK Messgeräte GmbH
REV F, March 1999
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