ALZ 3740
5Pages

PRECISION SUBMERSIBLE PRESSURE TRANSMITTER FOR VISCOUS MEDIA DESCRIPTION ALZ 3740 is based on a high precision capacitive ceramic oil free sensor with ranges starting at 40 mbar for measuring liquid levels as low as 40 cm. High overload capacity of the sensor, flush ceramic diaphragm and stainless steel housing make ALZ 3740 a transmitter of choice for the viscous and abrasive media. For even better compatibility with aggressive media please refer to the similar model ALZ 3742 with the plastic housing. SPECIFICATIONS Ranges: 0.4 mH2O up to 100 mH2O Basic accuracy: ±0.25% Sensor: high precision ceramic capacitive Probe: Ø40 mm, AISI 316L Output signal: 4...20 mA; RS-485 / Modbus RTU; Media temperatures: -20…+70 °C Optional: Ex ia, HART®, Pt100 temperature sensor APPLICATIONS Viscous media Abrasive media Sewage, waste water, sludge Precise level monitoring in tanks Appearance, mounting kit contents and/or specifications are subject to change without prior notice. We are constantly working on further improvement of our products. Delivery is subject to standard terms of delivery. © 2020 Piezus Page 1. Version: 11.0 Date: 20.05.2020

TECHNICAL SPECIFICATIONS MEASURING RANGES Pressure range, bar 0...0.04 0...0.06 0...0.10 0...0.16 0...0.25 0...0.40 0...0.60 P > 0.1 bar Accuracy, % of span* ≤ ±0.25 ≤ ±0.5 Temperature effect, (% of span / 10 °C) ≤ ±0.2 ≤ ±0.3 Compensated range -20…+70 °C 0…+70 °C Power supply effect ≤ ±0.05% of span / 10 V Load resistance effect ≤ ±0.05% of span / kOhm (transmitters with current output) Long term stability ≤ ±0.1% of span / year Response time (10...90%) ≤ 150 ms * Accuracy includes non-linearity, hysteresis and non-repeatability. OPERATIONAL SPECIFICATIONS Medium temperature (depends on...

ELECTRICAL SPECIFICATIONS Output signal Power supply, US Load resistance, R 4…20 mA / 2-wire 12…36 V ≤ [(US – 12 V) / 0,02 A] Ohm* 4…20 mA / HART® 0.5…4.5 V / 3-wire 5 V / 6…15 V RS-485 / Modbus RTU 12…36 V * For output signal 4…20 mA / HART® minimum load resistance for digital communication: 250 Ohm. ELECTRICAL CONNECTIONS / PIN ASSIGNMENT Circuits power + power – ground power + power – signal + ground T+ T– T– power + power – A B ground power + power – ground Cable gland wires white brown yellow-green white brown green yellow-green yellow pink gray white brown yellow green yellow-green...

ORDERING CODE UNIT OF MEASUREMENT CABLE LENGTH OUTPUT SIGNAL PVC PUR FEP Other (specify when ordering) any length in meters (e.g., 010M means 10 meters) 4…20 mA / 2-wire (standard) 0.5…4.5 V / 3-wire RS-485 / Modbus RTU 4…20 mA / HART® (up to 400 kPa) Other (specify when ordering) Page. 4. Ordering code. Version: 11.0 Date: 20.0

ORDERING CODE (CONTINUED) ALZ 3740 FKM NBR EPDM Other (specify when ordering) HOUSING MATERIAL Stainless steel 316L Stainless steel 904L (sea water resistant) Standard Pt100 temperature sensor (incompatible with RS-485 / Modbus RTU) Other (specify when ordering) Anchoring clamp for submersible transmitter PZ 1024 Power supply unit BZ 05 / BZ 10 Dry air junction box for submersible transmitters Page. 5. Ordering code. Version: 11.0 Date: 20.05.2020