Emerson VLS**435A, Mobrey VLS Series, VLSK*135A, VLSK*335A, VLSH**35A Operating Instructions Manual
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Mobrey™ Series VLS
Vibrating Level Switch
Operating Instructions
IP4001, Rev CA
March 2018
Mobrey Series VLS
March 2018
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8
1.0 Introduction
1.1 Overview
Mobrey vibrating rod level switches are suitable for low and high level indication of granules and
powders with a minimum 0.05 kg/dm
Dust Ex versions are available for using the instrument in an explosion-proof environment.
The vibrating rod is a mechanical resonant system, excited and kept in resonance by an electronic unit.
The medium to be measured, when reaching the vibration rod end, will damp the vibration. The change
in vibration intensity is sensed by an electronic unit, which, upon the elapse of the delay time, actuates
the output circuit.
Operating Manual
IP4001, Rev CA
3
density such as cement, lime, sand, grain, feed, sugar, etc.
1.2 Accessories
User manual (IP4001)
2 off 3-pole terminal blocks
1½-in, sealing, for BSP only
2 off M20x1.5 cable glands
1.3 Order code
K Standard model with 1 x SPDT alarm relay
(1)
H
High temperature model with 1 x SPDT relay (not available with Extended Cable option)
B R 1½-in. BSPT mounting
N 1½-in. NPT mounting
1 Standard length rod, 207 mm insertion length
3 Extended rod, 300-3000 mm insertion length
4 Cable extended, 1000-20000 mm insertion length
1Z 20-255 Vac / Vdc, no hazardous area approval
3 Aluminum Alloy housing, powder coated
9 As code 3, but with Remote Electronics
5A 20-250 Vac / 20-50 Vdc, ATEX Dust Certification II 1/2 D
1. Only for standard and rod extended versions.
2
/**** State rod or cable extension length in mm
Operating Instructions
Standard version
Extended rod version
Cable extended version
~90
116
L=207
133
S=46
A
B
C
~90
A
B
C
S=46
116
133
L=300-3000
L=1000-2000
133
~90
A
B
C
S=46
116
IP4001, Rev CA
1.4 Dimensions
Figure 1-1. Mobrey Series VLS Dimensions
Mobrey Series VLS
March 2018
A. 2 off M20x1.5 conduit entries
B. 2 off NPT
C. 1
Dimensions are in mm.
1
1
/2-in. conduit entries
/2-in. BSP or NPT threaded process connection
2.0 Installation
When installed in a potentially explosive atmosphere, reference should be made to IP4001/SI.
Prior to installation, it is advisable to check the switching function for proper adjustment on a sample
quantity of material (see “Adjustments” on page 6). The unit may not work with mediums that are within
the specified density range, but have very large granules or have too little friction.
Handle the device with great care, especially the sensing probe. Any impact on
the sensing probe may ruin its resonance system. A protective shield should be
installed (see inset, right) if the probe is exposed to falling material or an
excessive mechanical load.
3
Mobrey Series VLS
Incorrect
Correct
Incorrect
Correct
March 2018
Operating Manual
IP4001, Rev CA
Screw in the device by its hexagon neck. After screwing tight the process connection, the housing can be
rotated (up to maximum of 300°), to adjust the cable gland to the required position.
It might be necessary to install the device at an offset level position relative to the switching level actually
required, taking into account caving or arching of the material in the silo (see Figure 1-2).
Figure 1-2. Examples of Correct and Incorrect Installations
4
Operating Instructions
Incorrect
F = 500 N.
M = 100 Nm.
M = 100 Nm.
F = 45 kN.
Standard version
VLS**1
Extended rod version
VLS**3
Cable extended version
VLS**4
IP4001, Rev CA
With powder level detection, the device should be installed at an inclination exceeding the angle of
repose (or vertically in case of high level detection), to prevent powder deposition on the vibrating rod
that might substantially reduce the self-cleaning effect. Avoid mounting the rod in a recess (Figure 1-3)
Figure 1-3. Avoid Mounting Rod in Recess
Mobrey Series VLS
March 2018
In the case of tanks that are likely to be exposed to intense vibrations, necessary provisions shall be made
for damping the vibrations acting on the device (e.g. vibration damping inserts made of rubber have to
be applied).
Figure 1-4. Maximum Torque and Force
5
Mobrey Series VLS
March 2018
3.0 Adjustments
The enclosure must not be opened when the equipment is electrically energized.
Remove the top cover of the housing to access the connection terminals and adjusting switches.
In case of Dust Ex instruments, the housing cover can only be opened after the removal of the cover
securing clamp.
Do not remove the wire from terminal pin 1 (Figure 1-5 on page 7) as it is an internal connection.
For grounding the unit, use the PE grounding screw terminal PE.
After correct installation, the electrical connections established, the housing cover fitted and secured,
the device is ready for operation. The switched-on state is indicated by the lighting of the LED.
The DENSITY setting (switch A) is to be set in accordance with the material density:
LOW position
– Recommended for loose and light materials with density below 0.1 kg/dm
– Represents small energy and amplitude of vibration as well as great sensitivity of detection.
Operating Manual
IP4001, Rev CA
3
.
HIGH position
3
– Recommended for (thick and heavy) materials with density over 0.1 kg/dm
.
– Represents vibration with great energy and amplitude, and small sensitivity of detection.
The instrument may not switch correctly in mediums with a density of less than 0.05 kg/dm
3
or with very
small internal friction.
To obtain FAIL SAFE alarm (switch C), use the de-energized state of the output as an alarm. A power
breakdown will then also be considered to be an alarm (see Table 1-1 on page 7).
The delay (switch B) is to be selected to comply with requirements of the process control technology the
unit is used for. Standard (switching delay is ~5 seconds) or fast response (switching delay is ~2 seconds)
can be selected.
Note
When operating the switches, standard electrostatic discharge precautions should be taken to avoid
damaging the instrument.
6
Operating Instructions
C
N
N
L1
123
456
IP4001, Rev CA
Figure 1-5. Electrical Connections
Mobrey Series VLS
March 2018
L1
PE
PE
Table 1-1. Operation
Power Probe
A B CStatus LED
250VAC
8A/AC1
NO
NC
Not vibrating
(covered)
Fail-safe
mode
Low
LED Relay
Green
Energized
On
Fails
Vibrating
(free)
Low or
high
High
Low
High
Red
De-energized
Red
De-energized
Green
Energized
Not lit
De-energized
7
Mobrey Series VLS
March 2018
4.0 Maintenance
Mobrey Series VLS devices do not require maintenance on a regular basis. In some instances, however,
the vibrating section may need a cleaning from deposited material. This must be carried out gently,
without harming the vibrating section of the vibrating rod.
Repairs during or after the guarantee period are affected by Emerson. Equipment sent back for repairs
must always be cleaned or neutralized (disinfected) by the user.
5.0 Specifications
Table 1-2. Specifications for Standard, Rod Extended, and Cable Extended Versions
Category Standard Rod extended Cable extended
Probe length 207 mm 0.3 to 3 m 1 to 20 m
Wetted-parts materials
Housing material Aluminum: Powder paint coated
Process connection 1½-in. BSP or 1½-in. NPT
Operating Manual
IP4001, Rev CA
1.4571 Probe: 1.4571
Cable: PE coated
Operating temperature ranges See Figure 1-6 and Table 1-3
Maximum pressure (absolute) 25 bar (2.5 MPa) 6 bar (0.6 MPa)
Minimum medium density
Response time (selectable)
Supply voltage (universal)
Power consumption 2.5 VA, 2 W
Electrical connections
Output SPDT (potential free), 250 Vac, 8 A, ac 1
Ingress protection IP67 (NEMA6) EN 60529:2001
Electrical protection Class I. (to be grounded)
Ex protection mark ATEX: II 1/2 D Ex ta/tb IIIC T90 °C… T170 °C Da/Db
Weight (with extension) 1.88 kg 1.88 kg (+1.4 kg/m) 1.88 kg (+ 0.6 kg/m)
Storage conditions
1. May depend on friction and granular size of the medium.
(1)
for normal types M20x1.5 plastic glands for cable Ø 6 to 12 mm,
2 pcs. plug-in type terminal blocks for 0.25 to 1.5 mm2 wire cross section
0.05 kg/dm (maximum granular size: 10 mm)
Not vibrating (covered): < 1.8 seconds or 5±1.5 seconds
Vibrating (free): < 2 seconds or 5±1.5 seconds
Normal type: 20…255 Vac/Vdc
Ex type: 20…250 Vac (50/60 Hz) or 20…50 Vdc
2 pcs. M20x1.5 cable glands with ta lIIC protection type or
internal thread for 2x ½-in NPT cable protection pipe
Ambient temperature range: -35°C to +60 °C
Relative humidity: 98% (maximum)
8
Operating Instructions
TA (°C)
T
P
(°C)
60
20
35
-30
-30
50
75
110
160
IP4001, Rev CA
Figure 1-6. Ambient (TA) Versus Process (TP) Temperatures
Table 1-3. Thermal Data
Process temperature (Tp)
(EPL Da – category 1D)
Ambient air temperature (Ta)
(EPL Db – category 2D)
Maximum surface
temperature (process
connection)
Maximum surface
temperature (T)
T Class
1. The process temperature can reach +95 °C for a maximum period of one hour.
Mobrey Series VLS
March 2018
VLS**435A VLSK*(1/3)35A VLSH**35A
+60 °C +70 °C +80 °C...
+95 °C
+60 °C +50 °C +60 °C +60 °C +50 °C +60 °C +50 °C +35 °C
+85 °C +85 °C +95 °C +85 °C +85 °C +95 °C +95 °C +135 °C
+85 °C +85 °C +95 °C +85 °C +85 °C +95 °C +110 °C +160 °C
T90°C T100°C T90°C T100°C T115°C T170°C
+60 °C +70 °C +95°C +110 °C +160 °C
(1)
Minimum ambient air temperature (Ta) = –30 °C
Minimum process temperature (Tp) = –30 °C
9
Mobrey Series VLS
March 2018
Operating Manual
IP4001, Rev CA
10
Operating Instructions
IP4001, Rev CA
Mobrey Series VLS
March 2018
11
Operating Instructions
IP4001, Rev CA
March 2018
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Emerson Automation Solutions
Rosemount Measurement Ltd.
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Slough, Berks., SL1 4UE, UK
+44 (0)1753 756600
+44 (0)1753 823589
Infocentral@Emerson.com
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