HM 1400 TRX Total Mercury Analyser - Webshop, Gas Analysis ...

4. Theoretical foundationsThe cooler setpoint temperature is fixed on the cooler. The PLC monitors thecontrol hysteresis within pre-programmable temperature limits. The measuringgas then passes through the condensate collector, which has the function of agas/liquid separator.The condensate produced is conveyed into a condensate tank with levelmonitoring using a hose pump. A liquid monitor with emergency shutdown forthe gas pump is installed between the cooler and the photometer.Figure 4.6: Function level of cooler and gas conditioning4.8 Other electronics, control and measuring value calculationThe control, measuring value calculation and status monitoring of themeasuring device are undertaken by the internal PLC. Use of the measuringdevice is described in Chapter Operation (page 47). All possible functions andthe function descriptions are clearly shown. Apart from the "Condensate inmonitor" error message, which instantly switches the measuring device toStandby status, the other limit value infringements cause a system shut-downafter 2 minutes. Limit value infringements mean that the measuredtemperatures, system pressure and volume flow pass outside theirprogrammed permissible ranges. Another exception is the "Condensatecontainer full" error message, which only switches the measuring device toStandby status after 12 hours. Actual, nominal and limit values as well asstatus messages can be queried on the interactive display. The event memorycan also be activated via the display. For service purposes, it is helpful to be38 HM 1400 TRX