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PD 940 DIPSTICK

Level, conductivity and temperature transmitter, Analogue current output: 4-20 mA, Digital I/O, P-NET via RS485

Price:DKK 9,975.00
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Description

  • Compact sanitary design – designed for the food industry
  • Level, conductivity and temperature sensor in a single unit.
  • Handles foam in liquid – only the equivalient liquid of the foam is counted
  • Reliable continuous level measurement
  • Designed for top mounting in vessel
  • Flexible configurations to suit your specific application
  • Conductivity sensor
  • Temperature sensor, process temperature range 0 °C to 100 °C
  • Analogue current output: 4-20 mA
  • Digital I/O
  • Programmable in COPP
  • P-NET via RS485

 

APPLICATION

The PD 940 Dipstick is a hygienic electronic level sensor for electrically conductive liquid. In addition to level, it also measures the conductivity and temperature of the liquid.
A fast reacting temperature sensor is mounted in the tip of the dipstick

The dipstick is well suited for use in air eliminators, where there is often a lot of foam on top of the liquid, as the level signal includes only the equivalent liquid of the foam.

The level measurement is independent of the liquid conductivity, so the dipstick is self-calibrating and can be used with different liquids without any re-calibration.

The PD 940 Dipstick is mounted on the vessel using a clamp connection, with a special flange welded onto the vessel.

The minimum distance from the dipstick (including the tip) to the tank is 50 mm. The tip must be fully submerged in liquid to get an accurate measurement.

The dipstick can be used as a sensor where the level is represented an analogue output (4-20 mA) or it can communicate level, conductivity and temperature with the control system via a standard P-NET RS485 interface.
The dipstick includes a digital I/O which can be setup to e.g. control a pump in the measurement system, depending on the measured level.
The dipstick is programmable in COPP, which means that a part of, or complete automation application can run in the dipstick.
The program can make use of ready-made components to control and monitor any process – or machine application, both locally in the dipstick and via the network interacting with other devices.

 

Technical Specification

Analogue Current Output
Signal range (source) 0 – 22 mA
Calibration error @ Tamb. 20 °C Max. +/- 0.1 % of full scale
Temperature coefficient Tc Max. +/- 150 ppm / °C
Resolution: 0.06 % of full scale

Digital Input (referenced to -24 Vin)
Frequency. Max. 1 kHz @ 50 % duty cycle
Input On: Vin < 4.5 V, Off: Vin > 6.5 V
Hysteresis: Typ. 1 V
Line check: (*
Line open voltage: >0.75 * Vin
Line short circuit voltage: < 2 V
Input pull down resistance: 6.8 kΩ
Input active pull up (configurable) 3 mA

Digital Output (source)
Oneshot and Dutycycle time resolution 417 µs
Internal resistance Typ. 0.5 Ω
Output start current (duration max 200 ms) Typ. 5 A
Load current at ON (Source only) Max. 0.5 A
Short circuit cutoff delay time (current > 5A) 104 µs
Leak current at OFF Max. 500 µA

Temperature Measurement
Process temperature range 0-100 °C
Calibration error @ 20 °C +/-0.2 °C
Resolution Typ. 0.2 °C

Power Specifications
Supply voltage nominal 24 VDC
Supply voltage 12 – 32 VDC
Typ. internal power consumption (@ 24 VDC) 0.5 W

Environmental Conditions
Operation temperature -25 °C to +70 °C
Storage temperature -40 °C to +85 °C
Protection class IP67

(* Use shielded cable

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