DuraVibe - Model PZP - Vibratory Level Sensor - Diamond Shaped Probe for Powders & Bulk Solids
From Point Level Indicators, Controls, Sensors and Switches - Vibratory Probes
The Model PZP uses the vibrating probe principle to eliminate level indicator issues associated with temperature, humidity and material changes, while providing state-of-the-art electronic reliability and accuracy that requires no calibration. This vibratory sensor is extremely sensitive and works on a wide range of material densities...from very light to heavy. The diamond-shape single vibrating probe design means less material build-up on probe and is tip sensitive to be unaffected by material build-up near mounting base.
Features and Advantages:
Exceptional Durability
Patented steel gusset design provides industry-leading probe strength
Stainless steel probe construction for durable, maintenance-free performance
Excellent Versatility
Varying moisture, temperature, material composition? No problem!
Detects very light (1.5 lb/ft3) to heavy, dense materials with proper protective baffling
Pipe extension, cable extension and high-temp units are available
Peace-of-mind Reliability
Self-cleaning diamond shape probe eliminates false signals found with “tuning fork” designs
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
Patented Reinforced Design
- Patented Reinforced Design
- Tip Sensitive, Diamond-shape Probe
- DuraVibe LED Indicator
- Two Conduit Openings
- Bi-color LED Indication
- Die-Cast Aluminum Housing
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 moreIdeal 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.
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).
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).
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 TempProbes: -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
- MaxVertical Load at Probe End:
- 225 lbs [102kg] (1000N) - Standard & Pipe Ext.
- MaxHorizontal Load at Probe End:
- 34 lbs [15.4kg] (150N) - Standard & Pipe Ext.
- MaxTensile Load of Cable:
- 440 lbs [200kg] - Cable ExtVersion
- 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 ElecVersions
- 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 max12' [3.66m] for top mount, 2' [0.61m] for side mount
- Cable Extension: Polyurethane Jacketed Cable
- ApproxShip Dimsand Weight:
- Standard Probe: 17.75'Lx6.5'Wx6.5'H (451x165x165mm); 5lbs(2.3kg)
- Approvals:
- CSAUS/C: Ordinary Locations;
- Class II, Div1&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
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