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
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