Principle of Operation

The DuraVibe™ Model PZP 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 PZP is selectable. The single probe design prevents material bridging, which is common with the dual-blade (“tuning fork”) design.

Applications

Typical target materials include, but are not limited to:

Sugar, flour, spices, salt, powdered milk, tea(leaf), whole or ground coffee beans, rice, peanuts, feed & grain, tobacco, ice chips, sawdust, wood shavings, chalk, chemicals, polystyrene beads, Styrofoam®, plastic pellets, cellulose, glass, powdered clay, carbon black, foundry sand, gravel, cement, fly ash and more

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

Suitable for storage vessels where material is regularly changed. For example, one day corn is stored and then another day beans are stored.

Excellent for extremely lightweight materials with densities as low as 1.5 lb/ft3 (20 kg/m3); with a maximum particle size about 1.6 inches (40 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, diamond-shaped probe design




Pipe Extensions:
. For high and low level applications that extend beyond the length of a standard probe.
. Top-mount is intended primarily for high-level applications and is suitable for lengths up to 12’ (3.6m).
. 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





Cable Extensions:
. For top-mount, high-level applications where head clearance prohibits mounting of pipe extension or where free-hanging weight is preferred.
. Suitable for lengths up to 20’ (6.1m).

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




High Temperature / Remote Electronics:
. For applications where it is necessary to keep the electronics away from the vessel due to excessive temperatures or vibration.
. Interconnection of sensing probe and electronics is done by a conduit.
. Standard separation distance is 6’ (1.8m).

Ordering Information

ACCESSORIES:
Part #, Description
1-2400, Spanner Wrench For Cover Removal / Tighten
9-0027, 1/2” Flexible Conduit Assy, Liquid-Tight, 6 Ft. for Remote Elec. [Ord. Loc. units only] (3)
9-1005, Interconnect Cable w/ Pins at each end, 88 In. for Remote Elec. [Ord. Loc. units only] (3)
R3614-008, Interconnect Cable wo/ Pins for Remote Elec., Custom Length 16"+CSL, [Ord. Loc. or Haz. Loc. units]
9-4019, Mounting Flange, 150# ANSI, Painted Carbon Steel, 1-1/2” NPT
16-3070, Mounting Flange, K-style, Flat, Aluminum, 1-1/2” NPT

Note:
(1) Customer must specify exact required overall length to the nearest inch for Cable or Pipe Extension versions.
Overall length is the distance from end of threaded hub to the end of the sensor probe.
(2) High Temperature w/ Remote Electronics is NOT available on Cable Extension Probe.
(3) Conduit & cable for Remote Elec. are sold separately.

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

Part Numbers / Product Configurations

New DuraVibe PZP Series #9-87xx

Replaces...

Discontinued PZP Series #9-83xx.

(Consult Monitor for specific details.)

Specifications

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: -22˚ to 176˚ F (-30˚ to 80˚ C)
. Pipe Extension Probe: -22˚ to 176˚ F (-30˚ to 80˚ C)
. Cable Extension Probe: -22˚ to 176˚ F (-30˚ to 80˚ C)
. High Temp. Probes: -22˚ to 302˚ F (-30˚ to 150˚ C)

Ambient Temperature: -22˚ to 149˚ F (-30˚ to 65˚ C)
(Electronics, All Units)

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

Sensitivity:
. A: High, >/= 1.5Lbs/Ft3 (24kg/m3)
. B: Medium, >/= 10Lbs/Ft3 (160kg/m3)
. C: Low, Product build-up applications

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. Vertical Load at Probe End:
225 lbs [102kg] (1000N) - Standard & Pipe Ext.

Max. Horizontal Load at Probe End:
34 lbs [15.4kg] (150N) - Standard & Pipe Ext.

Max. Tensile Load of Cable:
440 lbs [200kg] - Cable Ext. Version

Resonance Frequency: 286 Hz (+/-1 Hz)

Housing: Powder coated die-cast aluminum; NEMA 4X, ENCLOSURE TYPE 4X,
IP66

Process Connection: 1-1/2" NPT (PZP), 1-1/2”NPSC (Vessel); 304SS

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

Conduit Connections: (2) 1/2" NPT; (3) 1/2" NPT for Remote Elec. Versions

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 1” pipe, Customer specified length max. 12' [3.66m] for top mount, 2' [0.61m] for side mount

Cable Extension: Polyurethane Jacketed Cable

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

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

Standard-Temp & Remote Electronics:
ATEX: (Ex) II 2D Ex tb [ia Da] lllC T75˚C Db
IECEx: Ex tb [ia Da] lllC T75˚C Db

Remote Probe:
ATEX: (Ex) II 1D Ex ia lllC T90˚C Da
IECEx: Ex ia lllC T90˚C Da
(See Bulletin #564K regarding specific
conditions of use.)

CE Mark
CHINA RoHS 2

Warranty

Monitor Technologies LLC warrants each DuraVibe^TM 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