AutoLog® Cathodic Protection RTU (Enhanced WRMU)
Pipeline CP monitoring · AutoLog 10SP +70 °C · IP65 stainless
Specialized RTU for pipeline cathodic-protection monitoring. Built on the AutoLog 10SP +70 °C controller with a five-channel 16-bit analog input front-end calibrated for CP measurement: rectifier voltage, current via shunt, reference potential and auxiliary inputs. Two on-board temperature sensors. Four digital inputs and four digital outputs for valve / contactor commands. IP65 / NEMA4 stainless-steel enclosure. ZRM +70 °C radio modem standard; Modbus TCP, GSM, TETRA or RS232/485 cable available as options. Normal or Redundant operation modes. Used by oil & gas pipeline operators worldwide.
Inputs & outputs
- Analog inputs
- 5× 16-bit, software-selectable per point: 0-800 mV DC, 0-3.2 V DC, 0-50 V DC, 0-100 V DC, plus 4..20 mA via external shunt; surge-protected and opto-isolated; external fuse protection
- Temperature sensors
- 2× on-board
- Digital inputs
- 4× 12/24 VDC, max 8 mA, PNP, opto-isolated
- Digital outputs
- 4× 12/24 VDC, max 1 A, NPN, opto-isolated
- Serial ports
- 2× Modbus RTU master/slave
- HMI (I²C port)
- Keypad & display (+70 °C variant)
Communication
- OPT1 — Radio modem
- AutoLog ZRM +70 °C, up to ~40 km line-of-sight at 5 W, bands 138-175 / 406-512 / 869-870 / 820-950 MHz
- OPT2 — TCP/IP
- Modbus TCP
- OPT3 — GSM
- GSM GPRS and SMS
- OPT4 — TETRA
- TETRA SDS
- OPT5 — RS232/485
- Wired, max 1 200 m
Power & data
- Powering
- 12/24 VDC or 10/18 VAC, max 5 VA; voltage-drop alarm
- UPS
- 12 VDC backup with voltage-drop alarm
- Programming
- Remote via radio network, or local via programming cable
- Data logging
- E.g. 16 time-stamped measurements × 3 000 records
SCADA
- Software
- Indusoft Web Studio SCADA, or any 3rd-party SCADA over Modbus
- Operation modes
- Normal or Redundant
- Web support
- Control-room views accessible from any Intranet PC; configurable user levels and firewall security
Environmental & physical
- Operating range
- −30 to +70 °C (Enhanced variant — all components rated)
- Storage range
- −40 to +80 °C
- Enclosure
- IP65 / NEMA4, stainless steel
- Made in
- Finland