ABLE RHEONIK RHM NT Series Installation and operating instructions

Installation & Maintenance Instructions
RHEONIK
Coriolis Flowmeter
RHE 12
RHM .. NT, ETx, HT
Reading Office
Cutbush Park, Danehill, Lower Earley,
Reading, Berkshire. RG6 4UT. UK.
Tel: [phone]
Email: [email protected]
Aberdeen Office
Unit 6 Airside Business Park, Kirkhill Industrial Estate,
Dyce, Aberdeen. AB21 0GT. UK.
Tel: [phone]
Email: [email protected]
Internet: www.able.co.uk
e-procurement: www.247able.com
Registered in England No: 01851002
VAT No: GB 417 2481 61

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RHEONIK Coriolis Flowmeter Operation Manual RHE 12 Page
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TABLE OF CONTENTS Page
Important safety instructions for operating coriolis flowmeters 4
Manufacturer’s Liability 5
Typical Applications and Benefits 6
Installation Instructions (in brief) 7
1. General Description of System
1.1. The Flow Measurement System 8
1.2. Dimensions of Transmitter Casing RHE12 9
1.3. Dimensions of Sensor RHM 9
1.4. Installing Transmitter RHE12 9
2. Assembly and Installation
2.1. Installation Instructions for measuring Sensor RHM 11
2.2. Heating / Filling of a Sensor (Flowmeter) 14
3. Electrical Connection of RHM
3.1. Cable Specifications 15
3.2. Wiring between the measuring Sensor and the RHE12 15
4. Installation of the RHE 12
4.1. Connecting the Power Supply 17
5. Operation and Programming
5.1. Basic Operation and Settings Principle 18
5.1.1. Startup Display 19
5.1.2. Measurement Display 19
5.2. User Setup 20
5.2.1. Resetting the Mass Totalizer 20
5.2.2. Zeroing 20
5.2.3. Measurement Value Damping 20
5.2.4. Rate and Quantity Unit Display 21
5.2.5. Low-flow Cut-off 21
5.2.6. Allocation of Analog Output Function 21
5.2.7. Span Analog Output 21
5.3. Basic Settings 22
5.3.1. Scaling-M 22
5.3.2. Scaling-D 22
5.3.3. Device Hi-limit Range 22
5.3.4. Temperature Compensation 23

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TABLE OF CONTENTS Page
5.4. Diagnostics Display Primary Sensor Signals 23
5.4.1. Diagnostics-Measuring Frequency 23
5.4.2. Diagnostics-Analog Output 23
5.4.3. Diagnostics-Pulse Output 24
5.4.4. Sensor Diagnosis 24
5.4.5. Display Run-Time Counter 24
6. Zeroing Procedure 25
7. Error Diagnostics 26
8. Adjusting the RHE12 Transmitter 27
8.1. Setting the Frequency Divider, Pulse Output
and Measuring Frequency 27
9. Troubleshooting 29
9.1. Error status of output 29
9.1.1. Pulse Output 29
9.1.2. Current Output 29
9.2. Notes on Troubleshooting 29
9.2.1. No Display available on the Device 29
9.2.2. Error Display "Pickup Error" 30
9.3. Notes on Troubleshooting 31
10. Technical Data-Transmitter 32
11. Transmitter Spare Parts 33
12. Technical Data-Measuring Sensor 33
A N N E X :
A Wiring diagram RHE 12, RHMxx
Wiring diagram RHE 12, RHE 15 (profibus adapter)
Wiring diagram RHE 12, RHM xx (free cable ends)
B Display-Matrix
C Ex-Safety Instructions
EC-Declaration of Conformity
D Using the HART® Communicator / SENSCOM Program
E Using the HART® Communications-Protocol / Command Specification
(NOT PART OF THIS BOOKLET –ask your Representative for supply if needed)

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I mp or ta nt s af et y i nst r uc tio n s f o r o p e ra t i n g c o r i ol i s f l o wme t er s
Please ensure that the following safety guidelines are observed at all times
When installing the appliances in hazardous areas, please observe the relevant local
installation regulations.
The flowmeters are made for a variety of applications and in compliance with interna-
tional standards. The operating conditions for the appliance are stated on the serial
number plate and must be observed at all times.
Where heated measuring sensors are concerned, sufficient thermal insulation should
be provided to ensure that the entire measuring sensor is always kept at the operating
temperature.
Please ensure that no rapid changes in the measuring instrument temperature are
caused by the measuring medium and observe the instructions given in this manual.
If the appliance is to be installed outdoors, and most notably in warmer climates,
weatherproof protection will need to be installed for the transmitter in order to protect
it against the impact of direct sunlight.
The maximum permissible pipeline pressure for the measuring sensor can be found on
the serial number plate. When using piston pumps, always remember that no pressure
peaks should be allowed to emerge which are above the maximum permissible pres-
sure level. Prior to delivery, the measuring tubes are subjected to an overpressure
test which is performed at 1.5 times the permissible operating pressure.
We wish to point out that the abrasive medium may reduce the wall thickness of the
measuring tubes and consequently lower the maximum operating pressure.
The construction material that comes into contact with the medium can be found on
the serial number plate. The manufacturer assumes no responsibility for the corrosion
resistance of the measuring instrument with regard to the medium to be measured.
Should the stability of the material that has been moistened by the medium be in
doubt, we recommend that you check the wall thickness of the measuring tubes from
time to time.
GE assumes no liability for the loss of production and/or consequential damage unless
this has been expressly agreed upon.
Measuring sensors for liquid foodstuffs and luxury foods or for pharmaceutical usage
must be completely scavenged before being used.
By way of avoiding electrostatic charge, the window on the transmitter may only be
cleaned using a moist, antistatic cloth.

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When used in hazardous areas, never open the transmitter casing while the power
supply is connected.
Only certified, type "Ex-d" cable bushings should be used in hazardous areas.
All unused cable bushings located in hazardous areas must be sealed using certified,
type "Ex-d" plugs.
To ensure that the appliances meet the demands of protection class IP66 (as prescribed by
EN 60529) following installation, please consider and observe the following points:
All of the casing screws must be tightened.
Always use suitable cable glands for the outer diameter of any cables that may be
used.
Tighten the cable glands.
Unused cable glands must be replaced by plugs.
Close all of the casing covers tight so that the sealing washers between the casing and
the cover are under pressure and sealed.
The limit values for the maximum permissible medium and ambient temperatures
must be observed at all times. The permissible temperature for the measuring sensor
can be found on the serial number plate. The permissible temperature for the trans-
mitter is 55°C.
Ma nuf ac t ure r’ s L i abi li t y:
Given the warranties and liabilities accepted by the manufacturer, please note that the
measuring instruments may not be utilised in life-preserving systems used in medical ap-
plications, or in motor vehicles, aircraft, watercraft or in the mining industry.
In addition, the manufacturer accepts no liability for damage resulting from the improper
or non-compliant usage of the appliance.
Liability for consequential damage or loss of production will solely be accepted if the cus-
tomer expressly requires such liability or if it has been expressly agreed in the sales con-
tract.

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Typical Applications and Benefits
For almost 20 years now, RHEONIK coriolis flowmeters have been used by industry to de-
termine the volume of such liquids and gases as:
Acid, lye, alcohol, hydrocarbons
Bitumen, fats
Oils (mineral oil, vegetable oil, synthetic oil)
Foodstuffs (vegetable oil, beer, liquid yeast, liquid sugar, chocolate, soup, sauces)
Beverages, flavouring, liquid carbon dioxide
Lacquers, paint, filling compounds, rubber products
Fuel (methanol, diesel, petrol, kerosene, methane gas, liquid hydrogen)
Coolant, hydraulic oil, brake fluid
Deionized (non-conductive) water
Animal fodder additives (molasses, rape seed oil, flavouring)
Pharmaceuticals
Cosmetics (creams, scented oils, emulsions)
Polyol, isocyanate, polyester, propellants (freon, pentane, etc.)
Gas station products (natural gas, propylene, propane)
Ultra-cold, liquid gases (hydrogen, nitrogen, oxygen, etc.)
Slurry, suspensions (oil/water)
The advantage of using this patented measuring principle is that it allows for direct mass
flow measurement.
Given the rapid reaction time, the appliances are suited to both batch dosing and flow con-
trol or monitoring.
The measurement is taken regardless of the pressure, temperature, viscosity, conductivity
or flow characteristics of the liquid.
Due to its unique design, the measuring sensor is durable enough not to wear down even
after many years of operation and is also a low-maintenance product.
Inside the liquid stream, there are no fittings or rotating parts that could block the flow
and consequently lead to a very costly shutdown of the production facilities.
Installing the flowmeter into the pipeline system is easy. No long tube runs in front of and
behind the sensor need to be taken into account and the measuring sensor can be mount-
ed almost directly behind turbulence creating elbows or pipe diameter reducers without
impairing the accuracy of the measurements.
Measuring media with fibrous content a high solid charge does not pose any real difficulty.
If used in accordance with the instructions, it is, unlike positive-displacement counters,
possible to do without expensive filters without actually damaging the measuring sensor.
Measurements can be taken by the measuring sensor irrespective of the flow of the liquid.
Sudden pressure peaks or water shocks in the pipeline will not damage the appliance. In
such an instance, other purely mechanical measuring procedures are prone to impeller
wheels overtorquing, axles breaking, or bearings becoming displaced, which all result in
the measuring device becoming unusable or even blocking the flow of liquid.
GE appliances are calibrated at the manufacturer’s site on precision test benches and can
be operated directly without the need for local adjustments. A calibration certificate is sup-
plied with the appliance.

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START
Installation recommendations v2.1
created by : [e-mail]
Changes without notice
RHM
RHM
Installation of
RHM XX
Fill RHM XX
densely
Zeroing
procedure
Begin Measuring
This is a short form, please read also our Field Manual
- Installing the sensor:
For liquids (1) with the product
connections above and
For gases (2) with the connections
below.
- The appliance should be firmly fixed in
place using the connections provided.
- When installing, please avoid locations
where heavy vibrations and electric
fields occur.
- Please ensure that the wiring is carried
out as per our drawing.
Caution:
Passive digital outputs are using
a pull-up resistance.
Please observe the maximum permissible
current of 10mA (never connect terminal 15
directly to an external voltage).
- Close the product valve. Two valves are recommended
for small sensors (RHM 015 - 03).
- Begin the zeroing procedure by pressing the "ZERO" button.
The zero point will be determined within approx. 20 secs.
Once this process has been completed, the yellow LED (direction of flow)
with the "+/-" indicator should flash.
- Open the valves and power up the pumps, etc.
The Rheonik mass flowmeter is now ready to run.
- Always check the stability of the zero point after making any major changes
- Before beginning initial operation,
please remove the shaft block
(only applies to large sensors > RHM 30)
and then firmly close the casing again.
- We recommend using at least one valve
during the zeroing procedure
- Check : No error message / indication at transmitter display?
- Check for stable zero display. Are there any error messages from the remote unit?
Rheonik Installation Quick Guide RHE 12
Wiring of
RHM XX-RHE 14
(1) Liquids
(2) Gases
- Power up the operating voltage and warming up
the RHE for about 30 minutes.
- Fill the sensor densely with the product
and, where possible, perfuse for several
minutes at a high flow rate.
- Caution: Avoid temperature shocks at all costs!
(Please observe the specifications listed in the manual)
16
15
13
12
14
11
+
-
RH E 12
Digital p ulseou tput
(opencollec torpassiv )
-
+
-
+
PE
Um = 30 V DC
Terminal s Um Im
i n t r i n s i c a l l y sa f e C i r c u i t s
1 - 2 8,6 V 144mA
3 - 4 7,4 V 27mA
3 - 5 7,4 V 27mA
6 - 7 7,4 V 27mA
8 - 9 7,4 V 27mA
n o n i n t ri n s i c a l l y s a f e
11 - 12 30 V 500 mA
13 - 14 14 V 100 mA
15 - 16 26 V 100 mA
1 / 1
H.G.R ud olph
U. Hettrich
Draw. -Re v.
Sheet
Project
Appr.
Drawn
Date
created/ revis ed
Customer
1
3
9
8
7
6
5
4
2
RHE 12 terminalbox (I/O,power supply)
increased safety"e".
intrinsicall y safe
Attention:
Thel ocaln ormatives fordevices in t hehazardous areah aveto be c onsidered !
Please also c onsiderthe s pecialc onditions and rules in ourfi eld manual
andt herespective advi ses.
Do noto pen covero f RHE 12, if powered.
Please co nsiderthe specif ied temperatureof sensor cable.
Note:
Sensor connections (terminal1 t o 9)are intrinsically safec ircuits.
Outputs (terminals 13 to 16) arega lvanically i solated.
current (openc ollector) max. 10mA !
HT-S EN SOR S (High Temperature):
Sc reen to ground connectionMU STB E done.
An additional potential equalisin g cable
is required(see Manual).
NT/E Tx - Sensors:
please DO NOT c onnect !
Wiring diagram RHE 12 S tandard E12W -E_v1_3
03.09.2010
Emitter connection (0V olt)
for pulseo utput
external voltage
max. 24 VD C
Drive coils
Temperature
Sensor PT100
Mass F low Meter
Sens or RH Mxx
Pick -up coil 1
Pick -up coil 2
1
2
3
4
5
6
7
8
9
10
noni ntrinsically s afe
analogo utput( active )
current loo p : 0/4 -20 mA
max. 470Ohm
FI ELD COM MUNIC ATI ON PROTO C OL
R
Pow erS upply:
24 VD C / 7 Wa tt (SELV )
white
grey
red
yellow
green
black
4 M H z
1:1
1:1 0
1:1 00
1:1 000
1:10000
1:1 00000
1:1000000
2 M H z
Card M521:
removefrondcoverf oraccess
example:
measurement frequency: 4 MHz
pulse-divider: 1:10
blue
yellow
grey
green
red
pink
white
brown
orangeorange
Drive -
Pick -up coil 1 +
Pick -up coil 2 -
Pick -up coil 1 -
PT 100-
Drive +
PT 100s upply +
Cable-Shiel d
PT 100s ignal 1 +
Pick -up coil 2 +

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1General Description of System
1.1 The Flow Measurement System
The complete flowmeter system consists of a:
Sensor, type RHMxx
Transmitter, type RHExx
Connection cable
Inside the measuring sensor, there are precision tubes that are energized by an electro-
magnetic drive system, which itself is fed by the transmitter, to vibrate at their natural
frequencies.
When a liquid or gas flows through the vibrating tubes, it is subjected to additional deflec-
tion due to the degree of inertia that is generated. This deflection is recorded electronically
by two velocity sensors and a high-precision electronic time delta.
This measured quantity is proportional to the mass flow rate. A further conversion into
physical units is done in a purely digital manner using a signal processor in the transmitter.
At the same time, all of the appliance’s functions are constantly monitored. Should any
disruptions occur, all of the errors that have occurred are immediately reported in the dis-
play.
The transmitter has a 4 to 20 mA analogue output with programmable span, which is pro-
portional either to the measured mass flow rate or the temperature; it also has an impulse
output that supplies mass-proportional impulses.
All of the outputs and measuring functions can be verified at any time by the user by using
the diagnostic mode in the appliance. The maintenance or new calibration intervals can be
monitored via a run-time counter.
For service or repair purposes, the transmitter and flow sensor can be replaced inde-
pendently of each other. This significantly reduces the costs of spare parts for the installed
flow sensor/transmitter.
During the factory calibration, the mass flow sensor can be calibrated independently of the
transmitter. All sensor-specific calibration data can be programmed using magnetic switch-
es located on the front panel.
To achieve this, the instrument does not need to be opened. All of the relevant data is
buffered in a non-volatile semiconductor device (EEPROM).

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1.2 Dimensions of Transmitter Casing
1.3 Dimensions of Sensor RHMxx
The dimensions can be found in individual data sheets, irrespective of the application of
the sensor. Data sheets or exact drawings for customized products can be obtained from
the dealer or the manufacturer.
1.4 Installing the Transmitter
Compact-Version:

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W i ri n g I n s t ruc ti o ns :
Never install or wire the appliance while it is connected to the power supply.
Always ensure that you connect the ground wire.
Always observe the permissible voltage stated on the serial number plate of the appliance.
The cable screens should be connected as shown on the connecting diagram. Special care
must be taken to ensure that the cable screens on the measuring sensor do not come into
contact with the measuring sensor casing (earthing connector) unless otherwise pre-
scribed.
The recommended maximum length of cable between the measuring sensor and the
transmitter is 5 meters.
Never allow cable bushings located between the measuring sensor and the transmitter in
the switch cabinets and the cable ducts to run alongside leads carrying high electric cur-
rent from electric machinery or inductive switch elements (electro-motors, frequency in-
verters, phase controllers, high-performance contactors, electric heaters, choke coils, etc.).
Always maintain a minimum clearance of 1 meter.
Never run the measuring sensor cable close to magnetic field sources such as electrical
heating coils, transformers or electric motors. The cable screen cannot act against magnet-
ic fields.
Always check the potential equalization between the transmitter casing and the measuring
sensor casing.
The cable used at the measuring point must always be temperature resistant. If necessary,
use a high-temperature cable between the sensor and the terminal box.
Securely screw down the terminal box once it has been installed (to avoid corrosion, mois-
ture-related short circuiting) and ensure that suitable cable glands are used that have been
adequately sealed.
I m por ta nt f o r t r o ub le - f re e o p e ra ti o n
Both the RHM transmitter and the measuring cable (RHM/RHE) must be installed as far
away as possible from any sources of electrical interference (transformers, high-voltage
switch elements, large electric motors, frequency inverters, etc.).

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2Assembly and Installation
2.1 Installation Instructions for Measuring Sensor RHM
The direction of flow through the measuring sensor is bi-directional. The pipeline next to
the measuring sensor should be rigidly mounted as closely as possible to the hydraulic
connectors using pipe clamps.
Any unsecured sections of the pipeline situated near the measuring sensor that might be
caused to vibrate should be avoided at all costs.
Due to the construction of the measuring sensor and the digital measuring filter of the sig-
nal processor, it is possible to minimize the amount of interference caused by vibrations in
the system.
Nevertheless, heavy vibrations can result in the measuring accuracy being significantly
impaired and, in certain circumstances, in the measuring sensor being damaged. The criti-
cal frequency range is between 50 and 300 Hz.
It is recommended that you install the measuring sensor at a point that vibrates as little as
possible.
A good decoupling requires having solid pipe clamps and a place of installation with a rigid
surface.
Where liquids with a low vapour pressure are concerned, the system pressure on the entry
side of the measuring sensor must maintain a certain safe gap above the vapour pressure
as otherwise measuring sensor cavitation may result which could significantly impair the
accuracy of the measurements. Where necessary, a pressure regulator should be installed
downstream from the sensor.
Once the flowmeter has been installed, the measurement system will need to be zeroed.
In order to ensure the accuracy of the measurements, this must be performed under full
operating conditions with the measuring sensor filled. Only non-leaking, high-quality
valves can ensure absolute zero flow during the zeroing procedure. In the majority of cas-
es, simply switching off the pump will not be sufficient.
For liquid measurements with solid particles, with a particle diameter of 0.5* inside diame-
ter for the measuring tubes (see pipe dimensions on the serial number plate of the meas-
uring sensor), a liquid filter will need to be installed upstream from the measuring sensor.
A gas filter must be installed for gas measurements with abrasive particles in the stream
(e.g. rust particles) in order to avoid any damage (abrasion) occurring to the measurement
tubes.
For liquid measurements, the RHM transmitter should be installed at a low point in the pipe
system as this will prevent gas bubbles from forming in the sensor.
Avoid heavy shocks or rapid acceleration in the measuring sensor. The measuring sensor
should be installed in such a way that it can be kept at the same temperature for virtually
the entire time.
W he n u s i ng l a r ge - si z ed m ea s ur i n g s e n s or s , a l way s e n s ur e t h a t t h e s h af t
b l oc k i s r e m ov e d b e f or e s t a rt - u p a n d t h e o r if ic e s h a ve b ee n s ea le d t i g h t
aga in .

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Example of System:
RHM
At this point, the pipe system must be as free as possible from all vibrations. In principle,
standard buildings or system vibrations have no significant impact on the accuracy of the
measurements. Nevertheless, very heavy vibrations should be avoided at all costs.
P le a se o bse rv e t h e f o l l ow i n g i n f or ma ti o n o n w h e re t o i n s ta l l t he s e n sor .
Installation Plan
Flow
Pipe
support
Pipe support
Shut-off valve
Terminal box
Piping connections
To measure the liquids, a sensor should be installed in such a manner that the pipeline
connections are located upstream and the casing faces downwards (see drawing); where
gases are concerned, the sensor should be installed with the pipeline connections pointing
downwards (with the casing pointing upwards). The sensor should be filled to the top with
the medium in question. In doing so, all of the gas bubbles must be removed entirely from
the appliance before start-up. This can be achieved, for example, by rinsing the pipes for
several minutes at a high flow rate.

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Flow
Sensor support
Flexible hoses
Pipe support
Pipe support
Not to be recommended
for high pressure.
Flexible hoses transmit
impact shocks to the
sensor
It is also possible to install flexible hoses. However, impact shocks are transmitted to the
measuring sensor as a result of the setup of the hoses which may interfere with the meas-
urements at high pulsating pressure levels.
This type of installation should be seen as an alternative in the event that it is not possible
to mount the unit onto the pipe suspensions.
If flexible hoses are connected directly onto the sensor, the flanges on the casing may be
used to affix the sensor.
To ensure a stable zero point, the sensor must be permanently installed at all costs.
For lower measurement ranges in liquids (5-30% of the final range), sensors RHM 30, 40,
60, 80, 100, 140 und 160 may be installed in a virtually horizontal position
(parallel to the ground).
When installed in this position, the flanges of the cas-
ing can be used to mount the unit. In either case, the
sensor and/or pipeline must be mounted in front of or
behind sensor RHM. Ideally, rigid pipe systems should
be used. Avoid drastic reductions as these can result
in cavities forming inside the measuring tubes. Where
necessary, any reducers should be installed several
meters away from the measuring instrument.
For sensor sizes RHM 30 to 160 with parallel tube loops, straight pipe sections must be pro-
vided for before and after the sensor if the medium is fed from a clearly different axis than
given by the inner pipe bend of the sensor.
For the afore-mentioned sensor designs, we recommend that, for the down flow, straight
piping of between 3-5 times the diameter of the pipe should be used and, for afflux, piping
of between 5-10 times the pipe diameter should be used in order to avoid significantly dif-
ferent flow velocities resulting for the two measuring tubes.
No valves or reducers should be installed between the pipe suspension and the sensor.
First-rate valves should be installed on the outflow side to ensure that the zero point can
be set without difficulty.

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Where the smaller RHM 015, 03 and 04 sensors are concerned, it is important that two
valves are installed, one each before and after the sensor. As the pipelines have proven to
be very instable here, we recommend that you additionally secure these sensor sizes to
the pipe suspension (feed block). To this end, GE offers an aluminium bracket that ensures
a perfect and simple means of installation.
Installation Plan with Bracket (Side View):
I m por ta nt N o t e o n t h e u s e o f H i g h - T e mp e ra t u re F l o w me te r s
( Ty pe R H Mx x E T 2 a n d H T ) :
2.1.1 Heating / Filling a Sensor:
The measuring sensor should be heated slowly so that the temperature differential be-
tween the medium and the sensor is less than 50°C.
By way of monitoring this, the temperature in the sensor is shown directly on the RHE dis-
play. Rapid heating or cooling cycles are not required at all during the service life of the me-
chanical appliances.
Caution: Temperature shocks may result in damage occurring to the electro-
mechanical components in the sensor. When changing temperature, we rec-
ommend a velocity of less than 1°C per second.
Example: Sensor temperature: 310°C; temperature of medium: 340°C;-virtually the
ideal scenario for filling.
Purging: When scavenging with a cleaning agent, always ensure that the afore-
mentioned recommendations are observed.
RHMxx sensor
Block (pipe connection)
Mounting bolt
Aluminium wall bracket
Wall or soild support

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3Electrical Connection of RHM
3.1 Cable Specifications
The following types of GE special cables are recommended as wiring cables to be used between
the measuring sensor and the transmitter and can be readily ordered from the manufacturer:
Type 1:
Standard cable –suitable for all appliances
Permissible cable temperature range:-20 ...+ 70°C
9 core, 4 pairs, individually screened and one wire unscreened
Material: PVC
Colour: Light blue
Outer diameter: 12 mm
Type 3:
High-performance cable –suitable for all appliances
Reinforced steel
Permissible cable temperature: -40 … + 70 °C
4 pairs of wires and 1 x 3 wires, individually screened
The two wires for the drive circuit have a specifically low ohmic resistance
Material: PVC
Colour: blue
Outer diameter: 16 mm
3.2 Wiring between the measuring sensor and the RHE12
The RHMxx sensor should be connected to the RHE12 transmitter using a 9-core screened
special cable.
It is very important to remember that the functional groups of drive coils and tapped coils
are kept separate (each one should have two jointly screened cores; see also enclosed
wiring schematic).
This will prevent the drive signals from attenuating onto the pickup wires.
The maximum distance between the sensor and the RHE12 transmitter is 5 meters.
Ideally the corresponding measuring cable supplied by GE should be used. In addition, we
recommend that, when laying the measuring cable, you should only use cable ducts where
no high-voltage or heavy-current cables have been laid (e.g. for motors).
Make sure that the wiring points are not connected to external systems such as motors or
other sources that are prone to electrical interference.
Also ensure that the cable screens cannot cause a short circuit of the sensor casing or any
other leads or parts. A conductor is used to connect RHE12 terminal No. 10 (galvanically
separate zero point inside the appliance) with the sensor (see also enclosed wiring sche-
matic). All of the screens are also connected to this electronics terminal.

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N ot e s o n R H M x x T y p e N T a n d E T x
Where NT and ETx sensors are concerned, the main screen and the single screens are sole-
ly connected to RHE12 using terminal 10 (galvanically separate zero point inside the appli-
ance) and not to the sensor but clipped and insulated at this point.
Taking this step will prevent potential equalization from flowing through the measurement
cable which may affect the measurement.
N ot e s o n R H M x x T y p e H T
For all RHM high-temperature sensors type HT (ceramic insulation), an additional potential
equalization lead must be laid between sensor RHMxx HT and transmitter RHE –terminal 3
to compensate for hygroscopic conductivity in the ceramic construction materials that are
used.
This lead will need to be laid on clean ground.
The measuring cable screen is only connected to the earth screw of the sensor if high-
temperature sensors are used.
Circuitry:
RHE 12 Earthing RHM
Terminal 10 Earthing
(See also notes under Wiring Schematic)
N ote s o n i n t ri nsi c al l y s a f e i n st al l a ti o n:
Only appliances with the relevant name plates of the sensor and the transmitter are in compli-
ance with the data specified in the licence.
Intrinsically safe flow measurement instruments must be connected in compliance with the en-
closed wiring schematics.
Please ensure that the appliance is earthed as per the regulations and in compliance with the
enclosed wiring schematics.
The sensor cable must also be suited for use in the relevant temperature range.
All intrinsically safe cables must be laid separately from all other cables. Ensure that they
correspond to the relevant temperature category and the maximum permissible sensor
temperature, which is also specified on the serial number plate of the sensor. All of the
electric connections performed by the user must comply with the national and local regula-
tions.

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4Installation of the RHE
The RHE transmitter should be installed in locations where the ambient temperature rang-
es from between -20 and +60°C. For temperatures outside this range, please consult the
manufacturer.
Avoid installing in places which are subject to extreme vibrations.
Furthermore, the transmitter must not be exposed to direct sunlight.
The RHM sensor and RHE transmitter are calibrated by the manufacturer as one system.
Please therefore ensure that the serial numbers tally with the relevant measuring unit stated in
the calibration certificate or on the serial number plate.
4.1 Connecting the Power Supply
The RHE 12 transmitter is equipped with a 24 VDC mains supply.
For trouble-free operation, the power supply must maintain the specified nominal voltage
of +- 10%.
When connecting the transmitters, always ensure that the power supply is switched off.
The earthing for the power supply should be connected using the relevant RHE earthing.
C au ti o n : W r o n gl y c o n ne c ti n g t h e e a rt hi n g w il l d i sa b l e t h e i n t ri nsi c al l y s a fe
fe a tur es !
A ll o u tp u ts a re g a l v an i ca l l y s e pa r a t e d f r o m t h e a u x il i ary p o we r a n d g a ti n g
c ir cui t .

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5Operation and Programming
This section deals with the operation of and settings for the RHE12 transmitter.
5.1 Basic Operation and Settings Principle
Two magnetic switches and a twin-line LCD each consisting of 16 characters are located on
the transmitter.
The delivered magnetic sticks are for activating the magnetic switches.
By holding a stick against the window pane, over the places where the arrows at the front
foil are marked, the switch will be activated. It is not necessary to look for the magnetic
polarization of the magnetic sticks, since the magnetic switches are realized by bipolar
HALL-sensors, they will work bidirectional.
Using the switches, it is possible to set every single operating parameter or to activate the
appliance functions.
Measurement range
Analog output span
Physical units
Low-flow cut-off
Diagnostic functions for measurement and output
Flow measurement calibration
Automatic zeroing
Measurement damping
Totalizer reset
Run-time counter reset
The transmitter is operated through the menu. Once in the menu, the current functions of
the two magnetic switches are displayed in the LCD display.
If the letters SET appear in the display over the key located below it, activating this key
will set the parameters or activate the reset.
Pressing NEXT will take you to the next menu point in the display.
To reach the basic set-up, which helps to adjust the transmitter to the relevant measuring
sensor, press both magnetic switches for a few seconds at the same time.
All of the settings are saved in a non-volatile EEPROM memory that guarantees data secu-
rity for a period of over 10 years.
I mp or ta nt N o t e !
Prior to delivery, the values in the basic set-up are calibrated by the manufacturer for the
relevant measuring sensor in accordance with the serial number plate of the transmitters
and do not need to be programmed. Changing these values can significantly impair the
accuracy of the measurements and should only be performed by trained users or in consul-
tation with the nearest GE-service centre.
To acess the applications set-up, activate the right-hand magnetic switch (in the meas-
urement data display) for approx. 5 seconds. With the help of the menu steps that follow,
the transmitter can be adjusted by the user for his specific application.
To activate Diagnostic Mode, activate the left-hand magnetic switch (in the measurement
data display, also for 5 seconds). This enables you to check the key functions of the meas-
uring instrument prior to its initial operation.

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5.1.1 Start-up Display
After power up, the start-up display will show the program version number and the appli-
ance address (0 to 15) for the serial data interface for a period of 5 seconds.
The appliance address should normally be set to "00". If several appliances are operated in
parallel on one serial data interface, you will need to allocate various appliance addresses.
5.1.2 Measurement Display
The following measurement values can be read of the local transmitter display:
Current flow rate display (lower display line)
Current direction of flow +/- (lower display line, left)
Current mass totalizer level (upper display line)
Current sensor temperature (upper display line, right)
The mass totalizer units are shown in Si units kg, t (kilogram, tonne) or in the US unit lb
(pounds).
The flow rate units are given as kg/min, kg/h, t/h or lb/min.
The temperature units that are displayed are °C (Celsius) or °F (Fahrenheit).

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5.2 User Set-up
To access the User set-up, activate the right-hand magnetic switch for approx. 5 seconds.
5.2.1 Resetting the Mass Totalizer
The mass totalizer will reset to Zero if the SET key is pressed for 5 seconds with the above
display showing.
5.2.2 Zeroing
Zeroing is automatically performed if the SET key is held down for approx. 5 seconds.
The actual zeroing process takes about 20 seconds. During this time, the display cannot be
used further. The words "ZEROING ACTIVE" will appear in the display.
An exact description of how to perform the zeroing can be found in the chapter entitled
"ZEROING PROCEDURE".
5.2.3 Measurement Value Damping
Press the SET key to set the reaction time and various measurement damping values. The
numerical value that is displayed indicates that digital filtering is being applied for this
number of sequential measurement values.