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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.
  • Designed for top mounting in vessel
  • Flexible configurations to suit your specific application
  • Reliable continuous level measurement
  • Conductivity sensor
  • Temperature sensor, process temperature range 0 °C to 100 °C
  • Analogue current output: 4-20 mA
  • Digital I/O
  • Programmable in COPP
  • Watchdog function available
  • P-NET via RS485

APPLICATION

The PD 940 DIPSTICK is a solid state level sensor device.
The level in the vessel is measured as the part of the stick that is submerged in liquid.

In addition to the level sensor capability, the Dipstick also measures the temperature and the conductivity of the liquid.
The Dipstick communicates with the control system via a standard P-NET RS485 interface.
The Dipstick offers an analogue output (4-20 mA) which can be setup to transmit either the level or the conductivity. The digital output can be setup to e.g. control a pump in the measurement system.

The fast reacting temperature sensor is mounted at the very end of the Dipstick

The device is programmable in COPP, which means that a part of, or complete automation application can be built and downloaded by the user. The program can make use of ready-made components to control and monitor any process or machine application, both locally in the device but also via the network interacting with other devices.

The PD 940 Dipstick only works when mounted on a metal vessel. The foot flange on the Dipstick electronic housing must have good electrical connection to the vessel wall.
The electric connection is achieved by the clamp used to affix the Dipstick foot flange to the flange welded onto the vessel.

Both level and conductivity measurement depend on the shape of the vessel, the distance from the dipstick to the tank wall, the product temperature, and the electrical characteristics of the product. Recommended minimum distance from the tip to the tank: 50 mm.

Due to these dependencies both the level and conductivity have to be calibrated to the actual construction and the different liquids.

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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