Pressure transmitter DPT-MOD

for environmental analysis

The DPT-MOD differential pressure transmitter for air conforms to Modbus over serial line protocol using RTU transmission mode and RS485 interface. The digital output signal is sent over Modbus enabling the DPT-MOD to connect directly to a field communications network. DPT-MOD requires less wiring than the traditional 3-wire transmitters since multiple devices can be connected on serial line. The DPT-MOD includes an Input terminal that enables reading of multiple other signals such as temperature or control relays over Modbus. The Input terminal has two input channels designed to accept 0−10 V, ntc10k, Pt1000, Ni1000/(-LG), and BIN IN (potential free contact) signals. For example, DPT-MOD can read values from one differential pressure measurement point and two temperature measurement points. Hence, the DPT-MOD does the work of three transmitters. Applications DPT-MOD series devices are commonly used in HVAC/R systems for: • fan, blower and filter monitoring • pressure and flow monitoring • valve and damper control • pressure monitoring in cleanrooms Technical specifications Suitable media: Air and non-aggressive gases Communication: MODBUS RTU, over RS485 8 data bits, parity bit: selectable, 1 stop bit, baud rate: selectable Response Time: 1…20 s selectable via menu Measuring element: Piezoresistive Max pressure: 400 kPa Accuracy (from applied pressure): ±1,5 % +1 Pa (including: general accuracy, temperature drift, linearity, hysteresis and repetition error) Electrical interface: • Supply voltage: 24 VAC or VDC ± 10 % • Power consumption: < 1.3 W • Output signal: via Modbus Materials: • Housing: ABS • Cover: PC • Pressure connections: Brass • Tubing: PVC