Node-HIU GSM Boiler Monitor
The Node-HIU GSM Boiler Monitor provides stand-alone monitoring and alarm functions for boilers or pipework systems, based on two (or more) simple to fit temperature sensors. It is the quickest way to gather basic operational data on systems.
Included as standard
- GSM Modem with IoT SIM Card
- Raspberry Pi 3 running Node-HIU
- 2 x Digital Temperature Sensors
- Power Supply and cable
All that is required to operate is a plug socket.
Basic function
The system monitors all temperatures to provide an alarm if temperatures drop too low for too long.
Alarms are forwarded by email, with the option to repeat alarm emails, and to send an email when the alarm clears.
Changes in readings are sent to a remote MQTT server for dashboards and remote alarm logic, as well as to cloud storage where all historical readings are saved and can be graphed.
Setup
The system is typically supplied with a SIM card, and is linked to our heatweb.info site for data storage.
The setup screen can be accessed by logging onto the WiFi hot spot provided by the system (using a laptop or mobile phone) and navigating to http://boiler:1880/ui in a browser.
| Description | The name of the system and alarm. |
| Enabled | If the alarm is turned on. |
| Sensor | All sensors is used for low level alarms, and will trigger once both sensors have dropped below the alarm setpoint. Any sensor is used for high level alarms, and will trigger if any sensor passes setpoint. |
| Condition | Less than, or greater than, representing low temperature or high temperature alarms. |
| Setpoint | The temperature the alarm triggers at. |
| For Longer Than | The time in seconds that the condition for an alarm must be met to trigger the alarm. This is to avoid nuisance alarms for brief events. If the system is supplying instantaneous hot water systems (HIUs) without a buffer tank, then the time should be set below 30 seconds. |
| Repeat | Resend the alarm every day. |
| Reset after Ok for | This is used to avoid repeating alarms where temperatures are cycling above and below setpoint, and should be set to longer than the typical cycle time of the system. |
Optional Extras
- Additional temperature sensors
- Differential Pressure Sensor, for pump alarming
- Static Pressure Sensor, for leak alarming
- Relay Outputs for alarms, pump control, pressurisation controls, or boiler sequencing
As the system is programmed using Node-RED, it is possible to update software to perform just about any BMS functionality.
