Vibrating Level Probe - DuraVibe VibraRod

MODEL VIBRAROD Vibratory Level Sensor

DuraVibe Logo

MODEL VIBRARODTM Vibratory Level Sensor - Single Probe Design
For Bulk Solids

The Model VibraRod™ is a vibration type level indicator that provides reliable, durable and versatile point level sensing in a variety of applications within the powder and bulk solids markets. The vibratory sensor has a single probe design that is self-cleaning. The Vibra Rod does not require calibration which makes for easy set-up.

Features and Advantages:

Stainless steel probe construction for durable, maintenance-free performance
Varying moisture, temperature, material composition? No problem!
Detects light (10 lbs/ft3) to heavy, dense materials with protective baffling
Pipe extension units are available
Peace-of-mind Reliability
Self-cleaning single probe design eliminates false signals found with “tuning fork” designs
Probe is tip-sensitive and unaffected by material build-up near mounting base
Reduced probe diameter and overall length to make it less vulnerable to bending and less susceptible to material build-up
Fail safe feature provides alarm in case of a power failure
Easy Set-up
No calibration required! Easy installation and commissioning
Three sensitivity settings for optimum performance
External status LED provides visual indication. (Ord. Loc. units only)
Superior third party approval compliance
Ordinary and Hazardous location approvals - View Specifications
Intrinsically safe probe for ultimate hazardous location protection

Two Conduit Openings
Bi-color LED Indication
Die-Cast Aluminum Housing

DuraVibe LED Indicator

Contact MonitorNeed some more information?...Click on the button.

duravibeTM Model vibrarodTM vibratory level indicator

Principle of Operation



Version Options

Ordering Information



Support Documents:

Model VibraRod Product Sheet
Model VibraRod Manual

ATEX / IECEx Supplemental (Bulletin #554K)

Application Questionnaire

2D Drawings & 3D Models - Registration Required


Similar Item(s):

Vibratory Level Sensor - DuraVibe PZP
DuraVibe(TM) Model PZP Vibratory Level Sensor


Principle of Operation

The DuraVibe™ Model VibraRod™ vibrating point level sensor is a mechanical resonance system that is excited at a resonance by an electrical circuit. Two piezoelectric crystals are mounted internally at the probe’s base. The electronic module generates an electrical signal that has an equivalent frequency to the probe’s resonant frequency; this signal is applied to one crystal, which causes the probe to vibrate. The vibration is monitored by the second crystal which provides an electrical signal back to the electronic module. When material contacts and surrounds the probe, the vibration is dampened and the signal from the second crystal is reduced. This signal reduction is detected by the electronic module, which reacts by providing a signal out of the module through the relay contacts. The sensitivity for the VibraRod is selectable. The single probe design prevents material bridging, which is common with the dual-blade (“tuning fork”) design.


Typical target materials for this switch include, but are not limited to:

Dry ingredients, whole or ground coffee beans, rice, peanuts, grain, feed pellets/crumbles, tobacco, sawdust, wood shavings, plastic pellets, powdered clay, sand, gravel, cement, lime, chemicals/pharmaceuticals, carbon black and more.

Versatile and durable, yet economical, vibratory solution.

Ideal for reliable detection of materials whose physical characteristics are variable, such as, changes in moisture, temperature, composition or geometric shape.

Excellent for a variety of materials with densities as low as 10 lbs/ft3 (160 kg/m3); with a maximum particle size of about 1 inch (25 mm).

Acceptable for installations where material clings to sidewall as probe is tip-sensitive and unaffected by material build-up near mounting base.

Level detection / back-up protection for dust collection hoppers.

Version Options

Standard Version:
. Single probe design
VibraRod Vibratory Level Indicator - Standard Probe

Pipe Extensions:
. For high and low level applications that extend beyond the length of a standard probe.
. Top-mount is intended for high-level applications only and is suitable for lengths up to 6’ (1.8m).
. Side-mount is acceptable for short lengths and where probe is properly supported.

Click Here for Reference on How to Determine Overall Insertion Length for Customer Specified Legnths
VibraRod Vibratory Level Indicator - Pipe Ext Probe

Process Connections / Reducer Fittings:
. 1-1/2” NPT x 1-1/4” NPT to attach VibraRod to a 1-1/2” ANSI pipe thread opening (Part #9-0101)
. R 1-1/2” [BSPT] x 1-1/4” NPT to attach VibraRod to a 1-1/2” BSP/ISO pipe thread opening (Part #9-0102)

Ordering Information

Part #, Description
1-2400, Spanner Wrench For Cover Removal / Tighten
9-0101, 1-1/2” NPT (male) to 1-1/4” NPT (female) Coupling Reducer Fitting
9-0102, R 1-1/2” [BSPT] (male) to 1-1/4” NPT (female) Coupling Reducer Fitting
1-0101, Mounting Plate, half coupling, Ctd. Carbon Steel, for 1-1/4” NPT
1-0112, Mounting Plate, half coupling, Stainless Steel, for 1-1/4” NPT
1-3316, Mounting Plate, heavy duty alum., for 1-1/4” NPT

(1) Customer must specify exact required overall length to the nearest
inch for Pipe Extension versions.
Overall length is the distance from end of threaded hub to the end
of the sensor probe.

Click Here for Reference on How to Determine Overall Insertion Length for Customer Specified Legnths

Part Numbers / Product Configurations

Vibratory Level Probe - DuraVibe VibraRod New DuraVibe VibraRod Series #9-86xx


Vibra Rod Level Indicator Discontinued VibraRod Series #9-84xx

(Consult Monitor for specific details


Power Requirements: 22-27VDC (+/-10%);
22-232VAC (+/-10%), 50/60 Hz

Power Consumption: ≤ 4VA (AC); ≤ 3W (DC)

Altitude: 6562 ft (2000m) max
Installation Category: II
Pollution Degree: 2

Process Temperature:
. Standard Probe: -4˚ to 176˚ F (-20˚ to 80˚ C)
. Pipe Extension Probe: -4˚ to 176˚ F (-20˚ to 80˚ C)

Ambient Temp (all units): -22˚ to 149˚ F (-30˚ to 65˚ C)

Output Relay:
. VAC: SPDT isolated; 3A @ 250VAC max
. VDC: SPDT isolated; 3A @ 30VDC max

. A: 10.0~12.5lbs/ft3 (160~200kg/m3)
. B: 12.5~15.6lbs/ft3 (200~250kg/m3)
. C: 18.7~21.8lbs/ft3 (300~350kg/m3)

Time Delay (Fixed):
. Hold-off (stop of vibration), delay of 1 second
. Hold-on (start of vibration), delay of 2 to 5 seconds

Fail-Safe: Switch Selectable: High or Low

Max. Load at Probe End:
100 lbs [45.4kg] (450N) - Standard & Pipe Ext.

Resonance Frequency: 355 to 390 Hz

Housing: Powder coated die-cast aluminum; NEMA 4X, ENCLOSURE TYPE 4X,

Process Connection: 1-1/4" NPT (VibraRod), 1-1/4” NPSC (Vessel); 304SS

Pressure Rating:
. Standard Probe: 145psi (10bar)
. Pipe Extension Probe: 145psi (10bar)

Conduit Connections: (2) 1/2" NPT

Local Indicator: Bi-color LED;
. Green = No material,
. Red = Material present,
. No light = No power

Probe Material (all versions): 304 Stainless Steel

Pipe Extension: 304SS 3/4” pipe, Customer specified length max. 6' [1.83m] for top mount, 2' [0.61m] for side mount

Approx. Ship Dims. and Weight:
Standard Probe: 17.75"Lx6.5"Wx6.5"H (451x165x165mm); 5lbs. (2.3kg)

CSAUS/C: Ordinary Locations;
Class II, Div. 1&2, Groups E, F, G; Class III
Hazardous Locations
with Intrinsically Safe Probe

ATEX: (Ex) II 2D Ex tb [ia Da] lllC T75˚C Db
IECEx: Ex tb [ia Da] lllC T75˚C Db
(See Bulletin #554K regarding specific
conditions of use.)

CE Mark



Monitor Technologies LLC warrants each DuraVibeTM sensor to be free from defects in material and workmanship under normal use and service for two (2) years from the date of purchase. The purchaser must notify Monitor of any defects within the warranty period, return the product intact, and prepay transportation charges. The obligation of Monitor Technologies LLC under this warranty is limited to repair or replacement at its factory. This warranty does not apply to any product which is repaired or altered outside of Monitor Technologies’ factory, or which has been subject to misuse, negligence, accident, incorrect wiring by others, or improper installation. Monitor Technologies LLC reserves the right to change the design and/or specifications without prior notice.


Last Rev.: Sept. 06, 2019