2
PENBERTHY
MODEL MGS-314 SERIES AND MGS-314D SERIES LEVEL CONTROL SWITCH
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
2 SPECIFICATIONS/APPROVALS
2.1 Enclosure
Watertight (Type 4) and explosion-proof (Type 7) cast aluminum housing; NBR O-ring
2.2 Switch
Output:
MGS-314 Series: SPDT (Form C) switch output: 5 amps at
125
/
250
Vac, non-inductive load
MGS-314D Series: DPDT (2x Form C) switch output: 10 amps at
125
/
250
Vac, non-inductive load
Repeatability:
Better than
1
/
32
"
Response time:
<100 milliseconds
Operating temperature:
-40 to 365°F (-40 to 185°C) - with third party approvals (CSA)
-40 to 645°F (-40 to 340°C) - without third party approvals
Ambient temperature range -4 to 104°F (-20 to 40°C)
Dead band:
± ½"
2.3 Approvals
Models: MGS-314-C/MGS-314D-C
CSA Approved Ex d
Explosion-proof for: Division 1, 2;
Class I; Groups B, C, D;
Class II; Groups E, F, G;
Class III; Type 4
When installed in accordance with control
drawing 7E741-009 (Figure 3)
CSA Approved Ex ia
Intrinsically safe for: Division 1, 2;
Class I; Groups A, B, C, D;
Class II; Groups E, F, G;
Class III; Type 4
When installed in accordance with control
drawing 7E742-009 (Figure 4)
Models: MGS-314-A/MGS-314D-A
ATEX/IECEx Certified
Flame proof for:
Ex d IIB + H2 T6 Gb
When installed with accordance with control
drawing 7E741-010 (Figure 5)
*Must use suitable certified conduit seal
ATEX/IECEx Certified
Intrinsically safe for:
Ex ia IIC + T6 Ga
When installed in accordance with control
drawing 7E742-010 (Figure 6)
3 THEORY OF OPERATION
While reading the theory of operation refer
to Figure 1 (MGS-314 Series) or Figure 2
(MGS-314D Series) for the location of the
components. The description is based on a
side view.
With the liquid level below the switch, the
toggle magnet should be at position 'A'. It
is held in this position by an attractor near
the magnet at the bottom of the toggle. As
the float ascends and passes the switch,
the draw between the float magnet and toggle
magnet is sufficient to overcome the attractor.
Consequently, the toggle moves to position
'B' and is held in place by a second attractor.
The movement of the toggle causes the switch
(or switches) to change state.
As the float descends with the liquid level it
passes the switch and the process described is
reversed. The toggle returns to position 'A' and
the switch returns to its original state.
4 INSTALLATION
4.1 Unpacking
Upon receiving the Model MGS-314/314D Series
Magnetic Level Meter Switch, check all
components carefully for damage incurred in
shipping. If damage is evident or suspected,
do not attempt installation. Flameproof joints
are not to be repaired. Notify the carrier
immediately and request a damage inspection.
Check each item against the packing list.
