940-111E-004 Datasheet, PDF (7/8 Pages) Magnetrol International, Inc. – Echotel® Model 940/941

3.3 Agency Approvals
AGENCY
APPROVED MODELS
PROTECTION METHOD
AREA CLASSIFICATION
FM & CSA
94X-XXXX-XXX
Non-Incendive
941-XXXX-XXX
Intrinsically Safe
These units have been tested to EN 50081-2
and EN 50082-2 and are in compliance with
the EMC Directive 89/336/EEC.
Class I, Div. 2, Groups A, B, C, & D
Class II, Div. 2, Groups E, F, & G
Class III, Type 4X, IP 66, T4
Class I, Div. 1, Groups A, B, C, & D
Class II, Div. 1, Groups E, F, & G
Class III, Type 4X, IP 66, T6
3.4 Troubleshooting
PROBLEM
No signal with level change
No change in output between
wet gap or dry gap
The switch is chattering
ACTION
Check wiring to make sure proper input voltage is supplied.
Make sure liquid is filling the transducer gap.
Check for dense foam on surface or dried product in the gap.
Unit may not function properly if either condition exists.
Check to see if transducer gap is plugged with solids.
Check for dense foam in gap.
Check for proper input voltage supply.
Check for turbulence. Relocate switch or isolate from turbulence.
Check for excessive aeration.
3.5 Model Numbers
BASIC MODEL NUMBER
940 Low cost compact ultrasonic level switch with SPDT relay output
941 Low cost compact ultrasonic level switch with current shift output
AGENCY APPROVAL
1 FM/CSA Intrinsically Safe & Non-Incendive (Model 941 only)
7 FM/CSA Non-Incendive (Model 940 only)
PROCESS CONNECTIONS
11 ³â„4" NPT
22 1" BSP (G1)*
23 1" 150# ANSI RF flange*
33 1.5" 150# ANSI RF flange*
43 2" 150# ANSI RF flange*
3T 1"/1.5" Tri-Clamp 16 AMP fitting*
4T 2" Tri-Clamp 16 AMP fitting*
* ^{Minimum actuation length of 2 inches or 5 centimeters}
ACTUATION UNITS
E English (inches)
M Metric (centimeters)
ACTUATION LENGTH
1 to 100 inches (Example: 4 inches = 004)
3 to 250 centimeters (Example: 6 cm = 006)
Available ESP length = 1” (001)
94
Note: Optional NEMA 4 cast aluminum junction
box assembly 052-7012-XXX is available
from the factory.
51-647 Echotel Model 940 & 941 Ultrasonic Level Switches
7