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Mode of operationThe freely programmable, self-monitoring limit monitors made by J. Dittrich Elektronic evaluate the signals measured by the connected measuring systems (e.g. for toxic or explosive gases, oxygen, carbon dioxide, temperature) and trigger an alarm or other subsequent functions when the values rise above or fall below a certain limit value.
An alphanumeric display constantly shows the measured values.
Different measuring systems can be connected to a limit monitor via 4-20 mA interfaces; altogether at most 2 measuring systems with type GWZ-S2, 4 with type GWZ-S4 and 6 with type GWZ-S6. | |  | | | Output of the signalsThe limit monitor outputs its signals via 4 relays:
- Two limit indicating relays signal when the values rise above or fall below the limit values; hence, they can, for example, trigger a preliminary or main alarm visually or acoustically or switch a ventilator on and off.
- A horn relay is provided additionally for controlling the horn.
- Since the limit monitor checks itself for any cable breaks, short-circuits and power failure, the alarm relay system indicates any malfunctions in the device.
| | | | | Freely programmable parametersThe following parameters and settings can be programmed freely for every sensor in the limit monitor (by means of keys or laptop and RS232 interface):
- the limit values,
- the end value of the measuring range,
- the unit of measurement, i.e. LEL, ppm, % by volume, °C etc.
- Alarm: Is triggered optionally when the values rise above or fall below the limit value.
- Alarm output: It is optionally saved, not saved or output as an impulse.
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