Catalog excerpts
PRECISION SUBMERSIBLE PRESSURE TRANSMITTER FOR AGGRESSIVE MEDIA DESCRIPTION ALZ 3742 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 plastic housing make ALZ 3742 a great choice for the agressive(*) and viscous media . Similar model ALZ 3740 in stainless steel housing is available for abrasive media applications. SPECIFICATIONS Ranges: 0.4 mH2O up to 100 mH2O Basic accuracy: ±0.25% Sensor: high precision ceramic capacitive Probe: Ø40 mm, plastic Output signal: 4...20 mA; RS-485 / Modbus RTU; Media temperatures: up to -20…+70 °C Optional: HART®, Pt100 temperature sensor APPLICATIONS Viscous media Agressive media (*) Sewage, waste water, sludge Precise level monitoring in tanks (*) please consult the manufacturer for particular media compatibility 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
Open the catalog to page 1TECHNICAL SPECIFICATIONS MEASURING RANGES P > 0.1 bar Accuracy, % of span* ≤ ±0.25 ≤ ±0.5 Temperature effect, (% of span / 10 °C) ≤ ±0.2 ≤ ±0.3 Compensated range -20…+50 °C 0…+50 °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. OPERATING CONDITIONS Medium temperature (depends on seal) Ambient temperature Storage temperature Service life MECHANICAL SPECIFICATIONS...
Open the catalog to page 2ELECTRICAL 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 power + power – A B ground power + power – ground Cable gland wires white brown yellow-green white brown green yellow-green white brown yellow green yellow-green white brown yellow-green
Open the catalog to page 3ORDERING 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
Open the catalog to page 4ORDERING CODE (CONTINUED) ALZ 3742 FKM NBR EPDM Other (specify when ordering) HOUSING MATERIAL PVC PVDF Other (specify when ordering) Standard 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
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