I/O pH ORP
Overview
SKU: ISXSTK-IOPH-1
Connect pH and ORP probes for sensing water quality. Has one configurable input for liquid flow sensor (pulse counting) and two relay outputs that can switch up to 700 mA loads at up to 60V, typically used to control valves. Sensor probes not included. Outputs integer 0-1000 for probes, 10 bit resolution.
Technical Specifications
| Connector | 10 position terminal block; screw clamp; Wire Gauge 16-26 AWG (0.5-1.5mm) |
| Processor | ARM Cortex microcontroller. 80MHz 128k Flash 32K Ram |
| I/O | pH+, pH-, ORP+, ORP-, Digital input (5V), 2 switched relay outputs (60V Max) |
| A-D Resolution | 10 bits |
| Modes | Sample on demand, send on compare above below change, send on change based on configurable hysteresis value, sample at fixed rate (max 1KHz) |
| Power Output | Software selectable 3.3V or 5V (500 mA) |
Pinout
| pH- | pH+ | ORP- | ORP+ | IO 3 | Relay1 | Relay Comm | Relay2 | DC Out | GND |
Relay Connection Wiring Guide
When using the relay outputs, connect the ground for the power supply powering your loads (solenoids, valves, etc) to the Relay Common terminal. Connect one end of your loads to the positive voltage of your power supply and the other end of your loads to the Relay 1 and Relay 2 terminals. The relay outputs are rated at 0 – 60 V DC max and 700 mA current max. If you need to switch higher voltages or AC power, you can connect inexpensive external relay adapters to the Interstacks I/O Expander block.
