Endress+Hauser soliphant II FTM 30 DR User manual

soliphant II
FTM30/31/32 DR
LevelLimitSwitch
Operating Instructions
Hauser+Endress
Nothing beatsknow-how
BA175F/00/en/08.98

Quick guide
Quick Start Adjusters and LEDs are on the electronic insert
in the separate housing T3.
Adjustment and function
Max.= Maximum fail-safe
Min. = Minimum fail-safe
= LED on
= LED off
Min.
Max.
B
<12V∆U
I
12
<4mA
I
12
FEM 41
12
<12V∆U
I
12
<4mA
I
1
2
red
red
red
Electronic insert FEM 41
for two-wire
AC power supply.
Electronic switch
FEM 44
12 345
3
3
4
4
5
5
Min.
Max.
345
345
B
red red
red
Electronic insert FEM 44
for universal power supply.
Relay output
with one potential-free
changeover contact (SPDT)
Min.
Max.
B
AFEM 45
43215789
71 82 93
71 82 93
71 82 93
71 82 93
red red
red
Switching delay
Page 20
green
Standby
Electronic insert FEM 45
for universal power supply.
Relay output
with two potential-free
changeover contacts (DPDT)
Quick guide FTM 30 DR, FTM 31 DR, FTM 32 DR

Table of Contents
1 Notes on Safety 4
1.1 Special Notes on Safety 4
1.2 Safety Conventions and Symbols 5
2 Usage 6
2.1 Application 6
2.2 Measuring System 6
2.3 Function 7
3 Installation 8
3.1 Design planning 8
3.2 Mounting 11
4 Settings 18
4.1 Selecting the fail-safe mode 18
4.2 Selecting switching delay (FEM 45) 20
5 Electrical Connection 21
5.1 Wiring 21
5.2 Connection on site 24
6 Commissioning 27
6.1 Preparations 27
6.2 Function test 27
7 Maintenance 28
8 Troubleshooting and Repair 29
8.1 Sources of error 29
8.2 Spare parts 29
8.3 Replacing spare parts 30
8.4 Checking 30
8.5 Returning the unit for repair 30
8.6 Disposal 30
9 Technical Data 31
9.1 Table to DIN 19259 31
9.2 Dimensions 33
9.3 Accessories 34
10 Index 35
FTM 30 DR, FTM 31 DR, FTM 32 DR Table of Contents

1 Notes on Safety
1.1 Special Notes on Safety
Approved usage The Soliphant FTM .. DR is used for limit detection with powdered or fine-grained solids.
See Technical Data for temperature, pressure, mechanical loads and bulk solids
characteristics.
Installation,
Commisioning,
Operation
The Soliphant has been designed to operate safely in accordance with current
technical, safety and EU standards. If installed incorrectly or used for applications for
which it is not intended, however, it is possible that application-related dangers may
arise, e.g. product overflow or explosion in a flammable atmosphere.
For this reason the instrument must be installed, connected, operated and maintained
according to the instructions in this manual; personnel must be authorized and
suitably qualified. The manual must have been read and understood, and the
instructions followed. Modifications and repairs to the device are permissible only
when they are expressly approved in the manual.
Explosion hazardous
areas If the Soliphant is to be installed in an explosion hazardous area, then the
specifications in the certificate as well as all national regulations must be observed.
Classes, Divisions and Groups are different according to FM or CSA approval,
see Product Structure.
•Ensure that all personnel are suitably qualified.
•Observe the regulations concerning measurement and safety at the measuring point.
1 Notes on Safety FTM 30 DR, FTM 31 DR, FTM 32 DR
4 Endress+Hauser

1.2 Safety Conventions and Symbols
In order to highlight safety-relevant operating procedures in the manual, the following
conventions have been used, each indicated by a corresponding icon.
Symbol Meaning
Note!
A note highlights actions or procedures which, if not performed correctly, may indirectly
affect operation or may lead to an instrument response which is not planned.
Safety conventions
Caution!
Caution highlights actions or procedures which, if not performed correctly, may lead to
personal injury or incorrect functioning of the instrument.
Warning!
A warning highlights actions or procedures which, if not performed correctly, may lead to
personal injury, a safety hazard or destruction of the instrument.
Device certified for use in explosion hazardous area
If the device has this symbol embossed on its name plate it can be installed or its cabling
laid in an explosion hazardous area
Explosion protection
Explosion hazardous area
Symbol used in drawings to indicate explosion hazardous areas.
– Devices located in and wiring entering areas with the designation
"explosion hazardous areas" must conform with the stated type of protection.
Safe area (non-explosion hazardous area)
Symbol used in drawings to indicate, if necessary, non-explosion hazardous areas.
– Devices located in safe areas still require a certificate if their outputs run
into explosion hazardous areas.
Direct voltage
A terminal to which or from which a direct current or voltage may be applied or supplied. Electrical symbols
Alternating voltage
A terminal to which or from which an alternating (sine-wave) current or voltage may be
applied or supplied.
Grounded terminal (earth connection)
A grounded terminal, which as far as the operator is concerned, is already grounded by
means of an earth grounding system.
Protective grounding (earth) terminal
A terminal which must be connected to earth ground prior to making any other connection
to the equipment.
Equipotential connection (earth bonding)
A connection made to the plant grounding system which may be of type e.g. neutral star
or equipotential line according to national or company practice.
Note!
Caution!
Warning!
E
X
E
X
FTM 30 DR, FTM 31 DR, FTM 32 DR 1 Notes on Safety
Endress+Hauser 5

2 Usage
2.1 Application
Soliphant is a rugged limit switch for silos containing powdered or fine-grained solids,
including those with very low bulk densities.
The material must be pourable, i.e. it must not stick or bake on.
The various versions ensure it can be used in a wide range of applications, including
explosion-hazardous areas and foodstuffs.
The instruments are designed for use in industrial applications.
Typical applications:
grain, flour, milk powder, cocoa, sugar, animal feed,
washing powders, dyes, chalk, plaster, cement, plastic granules
2.2 Measuring System
The components of the measuring system are:
•Soliphant II
– FTM 30 DR compact sensor
– FTM 31 DR with extension tube
– FTM 32 DR with rope
•Separate housing with electronic insert
– FEM 41 for two-wire alternating power supply
– FEM 44 for universal power supply
and relay output with one potential-free switchover contact (SPDT)
– FEM 45 for universal power supply
and relay output with two potential-free switchover contacts (DPDT)
•Control systems or signal devices that may be connected such as miniature
contactors, alarm transmitters or programmable logic controllers
U~
U~
U~
L1
N
e.g.FTM 31 DR e.g.FTM 32 DR
e.g. FTM 30 DR
BA175Y01
Fig.1
A Limit switch for two-wire
AC power supply
B Limit switch
for universal power supply
with one
changeover contact
C Limit switch
for universal power supply
with two
changeover contacts
2 Usage FTM 30 DR, FTM 31 DR, FTM 32 DR
6 Endress+Hauser

2.3 Function
The symmetrical vibrating fork is excited to its resonant frequency. When the fork is
covered by material, the vibrations are damped.
The tip of the fork is especially sensitive and makes it ideal for the limit detection of
materials that have a very low bulk density.
In contrast, the base of the fork is very insensitive and is therefore unaffected by
material build-up on the vessel walls.
The signal of the sensor is converted into a switching signal by the electronic insert in
the separate housing.
Soliphant can be operated in both minimum or maximum fail-safe mode, i.e. the
electronic switch opens or the relay de-energises when the minimum or maximum
level is reached, on fault or on power failure.
3
31
1
1
1
1
4
4
5
52
2
2
2
2
17
28
39
17
28
39
17
28
39
17
28
39
17
28
39
Min.
Max.
345
345
345
U
FEM 41 SPDT
FEM 44 DPDT FEM 45
Level Fail-safe mode
Electronic inserts
BA175Y02
Fig.2
The function of the electronic
switch or relay depends on the
level and fail-safe mode
FTM 30 DR, FTM 31 DR, FTM 32 DR 2 Usage
Endress+Hauser 7

3 Installation
3.1 Design planning
General information Height of the switch point at the device:
Switching will occur
– if the tip of the fork is covered by high-density material to several millimetres,
– if the tip of the fork is covered by low-density and loosely-packed material
to several centimetres.
Pneumatic conveying systems:
Turbulence can cause error switching. The Soliphant should thus be mounted away
from air and material flows or is protected from strong air currents.
Inspecting or cleaning the silo:
Install the oscillating fork in a protected area.
Mounting in the open:
Install a protective hood for the Soliphant.
It protects the field-mounted Soliphant from condensation in the sensor housing F6
due to extreme temperature variations.
Soliphant FTM 30 DR The compact Soliphant FTM 30 DR can be mounted in any position in a bulk solids
vessel. See Fig. 3 for types of installation.
Take into account the angle of the mound or outflow funnel when determining the
height of the installation point.
(~250 mm)
~10 in ~8 in
~8 in
(~200 mm)
~20°
(~200 mm)
max. 2.4 in
(60 mm)
a)
b)
c)
d)
e)
f)
g)
BA175Y03
Fig.3
Left:
correct mounting
a) top-mounted;
fork vertical but at any
orientation
b) laterally mounted,
fork angled slightly downwards
so that material can slide off
more easily
c) with shield,
length approx.10 in (250 mm),
width approx. 8 in (200 mm),
to protect against collapsing
mounds
d) in discharge hopper;
max.nozzle length 2.4 in
(60 mm), so that no build-up
occurs which prevents the fork
from oscillating
Right:
incorrect mounting
e) in filling curtain
f) fork orientation incorrect
(broad tine surface is
subjected to high load caused
by discharging material;
malfunction due to residual
material)
g) mounting nozzle too long
3 Installation FTM 30 DR, FTM 31 DR, FTM 32 DR
8 Endress+Hauser

Soliphant FTM 31 DRThe Soliphant FTM 31 DR with extension tube e.g.
– if mounting is only possible from above
– if the switch point is to be altered using the sliding sleeve (accessory)
– with heavy build-up on the silo wall (mounting from above or from the side)
Take into account the angle of the mound or outflow funnel:
– for calculating the required length of the sensor when ordering a
Soliphant FTM 31 DR
– for calculating the length of the mounting nozzle and mounting point, if you have an
instrument with a specific length.
The Soliphant FTM 31 DR may not be shortened!
Mounting from above:
Mount in the centre of the discharge hopper order to keep the lateral load caused by
discharging material to a minimum; or close to the vessel wall with an extra fastening
near to the fork.
Mounting from the side:
Only order the length of extension tube required as very strong forces can affect the
Soliphant due to outflowing material or when homogenising the material.
Fasten a very long Soliphant extension tube by using a tight-fitting nozzle or fastener.
Maximum length of a mounting nozzle:
Length of the Soliphant from process connection to the tip of the fork minus 7 in
(170 mm).
Check that there is enough space outside the silo for mounting.
a)
b)
c) d)
BA175Y04
Fig.4
a) Plate to protect against
inflowing material
b) Sliding sleeve for infinite
adjustment of the switch point
c) sufficient space for mounting
d) Protective hood against
condensation in the housing
FTM 30 DR, FTM 31 DR, FTM 32 DR 3 Installation
Endress+Hauser 9

Soliphant FTM 32 DR The Soliphant FTM 32 DR with rope if e.g.
– only top-mounting is possible
– there is strong build-up on the silo wall
– there is strong vibration of the silo
Take into account the angle of the mound or outflow funnel:
– for calculating the required length of the sensor when ordering a Soliphant
FTM 32 DR
– for calculating the length of mounting nozzle required and mounting point,
if you have an instrument with a specific length.
The Soliphant FTM32 DR may be shortened (with rope shortening set accessory).
The rope length cannot be increased.
The instrument should not be installed at the centre of the hopper but as near to the
vessel wall as possible in order to keep tension caused by discharging material to a
minimum. It should not, however, be so close that it touches the wall when it swings.
Check the stability of the roof and the tension acting on the rope. The tension caused
by material outflow is usually much higher with powders than with granular materials.
The Soliphant must be mounted outside the material stream when using pneumatic
conveying systems.
a) b) c) d) e)
f)
BA175Y05
Fig.5
Left:
correct mounting
a) next to the silo wall,
but with enough distance
from it and from material
build-ups
b) protected against material
flow
Right:
incorrect mounting
c) too near to the wall
and material build-up
d) in the centre of
the discharge hopper
e) in filling curtain
f) laterally mounted
3 Installation FTM 30 DR, FTM 31 DR, FTM 32 DR
10 Endress+Hauser

Separate housing for
the electronic insert
The mounting accessory enables the separate housing to be fixed to a wall or to a
horizontal or vertical 2" pipe.
Select a mounting point which is protected from vibration and heat radiation and
where there is sufficient clearance for connecting and calibrating the instrument.
3.2 Mounting
UnpackingThe fork of the Soliphant is packed in a cardboard tube for transportation. To prevent
the fork from being damaged, do not remove this until immediately before mounting.
See Section 8.6 "Disposal" for disposing of the packaging.
Instrument identificationBefore installing, check to see if you have the correct instrument:
Compare the product designation on the nameplate with that given
in the product structure on the next page.
Tools•Soliphant with thread: open-end spanner 1.97 in ~131/32" (50 AF)
•Soliphant with flange: open-end spanner to fit mounting bolts
•Cover lock: Allen key for Allen screws 0.12 in ~1/8" (3 AF)
•Clamp for separate housing: Allen key for Allen screws 0.16 in ~5/32" (4 AF)
•Dummy plugs for cable glands: Allen key for Allen screws ~3/8" (10 AF)
and 0.55 in ~35/64" (14 AF)
•Flexible metallic protective tubing for connecting cable: open-end spanner 11/16"
(~27 AF)
•Screwdriver, blade width approx. 0.2 in (approx. 5 ... 6 mm)
~3.5 ~5.9
~7.1
~4.1
~4.1~3.4 3.58
~5.9
2.76
ø2"
ø2"
a)
b)
BA175Y06
Fig.6
Separate housing T3
a) Terminal connection area
b) Electronics area for
electronic insert with
adjusters
FTM 30 DR, FTM 31 DR, FTM 32 DR 3 Installation
Endress+Hauser 11

Product structure Construction
FTM 30 DR compact version
FTM 31 DR with extension tube
FTM 32 DR with rope
Certificates, Applications
Q FM XP, Cl. I,II,III, Div. 1, Groups C, D, E, F, G
L CSA XP, Cl. I,II,III, Div. 1, Groups B, C, D, G and coal dust
Electronic Insert in Separate Housing
1 FEM 41, Two-wire AC, U~ 19 … 253 V
4 FEM 44, Universal power supply, U~ 19 … 253 V, U– 19 … 200 V
1 potential-free changeover contact
5 FEM 45, Universal power supply, U~ 19 … 253 V, U– 19 … 200 V
2 potential-free changeover contacts
Connecting Cable for Soliphant - Separate Housing
A 200 in ( 5 m)
B 400 in (10 m)
C ..… in *)
F 200 in ( 5 m) with flexible metal tubing
G 400 in (10 m) with flexible metal tubing
H ..… in *) with flexible metal tubing
*) min. 20 in (0,5 m)
max. 785 in (20 m), length includes
extension tube or rope of the Soliphant
Process Connection and Material
A Thread R 1½ ISO 7/1 (BSP), AISI 304
B Thread 1½ - 11½ NPT, ANSI B 1.20.1, AISI 304
H Flange DN 50, PN 40, DIN 2527, Form B, AISI 316
J Flange DN 80, PN 16, DIN 2527, Form B, AISI 316
K Flange DN 100, PN 16, DIN 2527, Form B, AISI 316
M Flange RF 2", 150 psi, ANSI B 16.5, AISI 316
P Flange RF 3", 150 psi, ANSI B 16.5, AISI 316
N Flange RF 4", 150 psi, ANSI B 16.5, AISI 316
Y Other process connections
OtherVersions
1 Standard features
9 Others
Sensor Length
For FTM 31 DR:
A ..… in - 16 … 155 in
(400 … 4000 mm)
For FTM 32 DR:
B ..… in - 30 … 765 in
(750 … 19500 mm)
can be shortened with set (accessory)
Y Others
FTM 30 DR-
FTM 31 DR- full
FTM 32 DR- product designation
Cable length and sensor length in inches
full
product designation
3 Installation FTM 30 DR, FTM 31 DR, FTM 32 DR
12 Endress+Hauser

HandlingWarning!
Errors can occur if the fork is damaged.
An explosion can occur if the diaphragm at the base of the fork is split.
When mounting, protect the fork against mechanical tension and shock.
Do not bend the fork!
If the Soliphant is too long when mounting then the fork must not be shortened!
If the Soliphant is too short when mounting then the fork must not be lengthened!
In such cases the mounting nozzle should be adjusted.
Do not carry the separate housing hanging by its connecting cable!
Warning!
BA175Y07
Fig.7
Do not
damage the fork,
bend the fork,
shorten the fork,
lengthen the fork
FTM 30 DR, FTM 31 DR, FTM 32 DR 3 Installation
Endress+Hauser 13

Tightening the Soliphant Before mounting:
Wrap suitable material around the thread so that it does not eat into the hole when
tightening and that the fork can still be positioned correctly.
Screwing in:
Caution!
When screwing into the threaded sleeve the instrument can be damaged if
– it presses against a vessel wall,
– bores into the material or into any build-up
– it is turned by its housing.
It is necessary therefore:
– to check before screwing in that there is enough free space in the silo.
– to turn the instrument only by the hex nut using an open-ended spanner
(with 1.97 in = 50 AF).
Positioning the fork:
This is only necessary with a laterally mounted Soliphant.
Note!
The function can be affected if material remains lying on the broad side of the fork.
With an instrument mounted for minimum detection outflowing material can damage
the fork if the broad side of the fork is uppermost.
It is necessary therefore:
To turn the hex nut so that the mark is at the top.
This indicates that the narrow side of the fork is upwards and that the material can
flow unhindered and does not remain on the fork.
Caution!
50
50 mm
BA175Y08
Fig.8
Screw in the Soliphant
with an open-ended spanner
Note!
50
50 mm
Mark on the hex nut
BA175Y09
Fig.9
Position the fork with the
mark at the top!
3 Installation FTM 30 DR, FTM 31 DR, FTM 32 DR
14 Endress+Hauser

Flange connection of the
Soliphant
Advance work:
Important for mounting a narrow nozzle:
– Weld the flange exactly at right angles to the pipe.
– The internal diameter of the pipe should be a min. 1.73 in (44 mm) throughout
its length.
Select a flange gasket suitable for the operating pressure and temperature.
Positioning the fork:
This is only necessary with a laterally mounted Soliphant.
Note!
The function can be affected if material remains lying on the broad side of the fork.
When using the instrument for minimum detection, outflowing material can damage
the fork if the broad side of the fork is uppermost.
It is necessary therefore:
To turn the flange so that the marks are at the top.
This indicates that the narrow side of the fork is upwards and that the material can
flow unhindered and does not remain on the tines.
(min. 44 mm)
= 90°
ø min.1.73 in
= 90°
= 90° = 90°
FTM 32 S:
max.5 in
max. 15°
(130 mm)
BA175Y10
Fig.10
Mounting nozzle and counter
flange welded exactly together
Figure on the extreme right
for FTM 32 DR only
Note!
II
Marks on the flange
BA175Y11
Fig.11
Position the fork with the
marks at the top!
FTM 30 DR, FTM 31 DR, FTM 32 DR 3 Installation
Endress+Hauser 15

Mounting a
Soliphant FTM 31 DR
with sliding sleeve
Warning!
Risk of injury: The Soliphant can be ejected at high speed from the sliding sleeve if it
is not mounted according to instructions.
It is necessary therefore:
To observe the operating manual enclosed with the sliding sleeve.
Soliphant-
Positioning the cable
entry
If the cable entry is not in the correct position after mounting the Soliphant, then it can
be positioned by turning the housing.
(The cable entry is sealed during shipment by a yellow plastic plug for protection.):
– Open housing cover
– Do not wipe away the lubricant on the thread of the cover or the gasket!
– Place the cover on a clean surface only.
– Loosen the screw in the clamping ring in front of the terminal block by 3 or 4 turns
– Turn the housing until the cable entry is correctly positioned;
when the Soliphant is mounted laterally then the cable entry should point downwards;
the housing can be turned through approx. 270°
– Retighten the screw in the clamping ring on the front of the terminal block
– Close the housing cover
Warning!
FEM ..
FEM ..
3...4 x
Cable entry
Cable entry
BA175Y12
Fig.12
Position cable entry
3 Installation FTM 30 DR, FTM 31 DR, FTM 32 DR
16 Endress+Hauser

Mounting the T3
separate housing
See Fig. 13, 14 for examples on how to fix to a wall or 2" pipe.
There should be enough clearance for connecting and calibrating the instrument.
Do not attach to components of the plant which vibrate strongly.
Cover the housing to protect it from direct heat.
If, after mounting, the connection area or cable entry (the cable entry is sealed
during shipment by a yellow plastic plug for protection) is wrongly positioned, then the
housing can be rotated.
Positioning the separate housing:
– Loosen the screw at the base of the housing by 3 to 4 turns
– Turn the housing in the direction required;
(the housing can be turned through approx. 270°)
– Retighten the screw at the collar of the housing
ENDRESS + HAUSER
a)
b)
BA175Y13
Fig.13
Separate housing T3
a) Terminal connection area
b) Electronics area
Ensure there is sufficient space
for connecting and adjusting!
ENDRESS + HAUSER
BA175Y14
Fig.14
Positioning the separate housing
FTM 30 DR, FTM 31 DR, FTM 32 DR 3 Installation
Endress+Hauser 17

4 Settings
Before connecting:
Carry out the settings on the electronic insert in the separate housing.
Warning!
There is a risk of explosion if the settings are carried out after connecting the instrument.
If the Soliphant is already connected then, before making the settings:
– Switch off all power to the instrument
– Secure against switching on
– Check that no power is switched on to the instrument
– Ground and short-circuit all cabling
– Wait 15 minutes before opening the separate housing
Opening
the electronics area Protect the separate housing from dripping water. Loosen the lock on the cover to the electronics area.
Unscrew cover.
Do not wipe away the lubricant on the thread of the cover or the gasket!
Place the cover on a clean surface only.
4.1 Selecting the fail-safe mode
Electronic insert
FEM 41
FEM 44
FEM 45
Maximum fail-safe: The circuit is open when the fork is covered or on power failure.
Minimum fail-safe: The circuit is open when the fork is free or on power failure.
Select the fail-safe mode required for your application using rotary switch B.
The switch can be turned in both directions; it then clicks in after 90°.
LEDs Function indicator.
The LEDs can only be seen when the separate housing is not in the explosion
hazardous area and when the cover of the electronics area can then be opened
during operation or testing.
Warning!
BA175Y15
Fig.15
Opened electronics area
with electronic insert FEM
4 Settings FTM 30 DR, FTM 31 DR, FTM 32 DR
18 Endress+Hauser

Min.
Max.
B<12V∆U
I
12
<4mA
I
12
FEM 41
12
<12V∆U
I
12
<4mA
I
1
1
2
2
U
1
2
0 V
red
red
red
BA175Y016
Fig.16
Electronic insert FEM 41
Two-wire AC version.
Electronic switch
Adjustment and function
Max.= Maximum fail-safe
Min. = Minimum fail-safe
= LED on
= LED off
FEM 44
12 345
3
3
4
4
5
5
Min.
Max.
345
3
3
4
4
5
5
B
U
1
2
0V
red red
red
BA175Y17
Fig.17
Electronic insert FEM 44
Universal power version.
Relay output with one
potential-free changeover
contact (SPDT)
Min.
Max.
B
AFEM 45
43215789
71 82 93
71 82 93
71 82 93
71 82 93
71 82 93
U
4
5
0 V
Switching delay
Page 20
green
standby
red red
red
BA175Y18
Fig.18
Electronic insert FEM 45
Universal power version.
Relay output with two
potential-free changeover
contacts (DPDT)
FTM 30 DR, FTM 31 DR, FTM 32 DR 4 Settings
Endress+Hauser 19

4.2 Selecting switching delay (FEM 45)
Electronic insert
FEM 45 only Short switching delay: Switching delay ∆t is 0.5 s when the fork is covered and 1.5 s when the fork is free.
Long switching delay: Switching delay ∆t is approx. 2.5 s when the fork is covered
and approx. 7.5 s when the fork is free.
Select the switching delay required for your application using rotary switch A.
The switch can be turned in both directions; it then clicks in after 90°.
Closing
the electronics area Screw down the cover of the electronics area Tighten the lock of the cover
B
A
~2,5 s ~7,5 s
~0,5 s ~1,5 s
∆t
FEM 45
Test
∆t
∆t
Fail-safe mode
Page 15/16
when
covered when free
BA175Y19
Fig.19
Adjusting and operating
the switching delay ∆t
with the electronic insert FEM 45
4 Settings FTM 30 DR, FTM 31 DR, FTM 32 DR
20 Endress+Hauser