Bacharach HGM-SZ Installation & Operation Manual

Also see for AGM-SZ: Product catalog Installation & operating instructions

Bacharach HGM-SZ Installation & Operation Manual Manual pdf 26 page image

Single Zone Gas Monitor22 P/N: 3015-4256 Rev 13SQUELCH – Sets a value of between 0.0 and 99.9 ppm that preventsthe display of measurements below that value. Factory default is 0 ppm.For example, if the squelch setting is set to 50 ppm, then the monitor willnot display measurements that are below that value. Use the Keypad toenter the desired value, and then press ENTER to save that value andreturn to the previous screen.ZONETEMP – Used to enter the temperature of the area beingmonitored in °C, thus giving a more accurate ppm reading. The factorydefault is 25°C. Use the Keypad to enter the desired temperature, andthen press ENTER to save that value and return to the previous screen.CAL – Used to change the monitor’s calibration factor. This function isto be used ONLY with instructions from a Bacharach Service Center.Factory default is 1.000.P-CHK – This Pressure Check function displays the current manifoldpressure and the stored ambient pressure in psia, along with thedifference between these two pressures and the current fault code.3.4. Gas Alarms3.4.1. OverviewIf the selected gas ppm level in the area being monitored exceeds its preset Leak, Spill, or EvacuateAlarm level (page 22), the SZ unit will detect this alarm condition and turn ON the front panel ALARMlight. Additionally, an external alarm device may activate and the monitor’s internal audible alarm maysound if those features have been enabled (pages 14 and 22).3.4.2. Clearing / Silencing a Gas AlarmOnce the gas-alarm circuit has been triggered all alarm indicators remain turned ON, even after thedetected gas level returns to normal. Press the SILENCE button to clear all gas-alarm indicators after thecause of the alarm has been cleared and the detected gas level has dropped below all alarm levels.Pressing the SILENCE button while a gas-alarm condition still exists causes the internal audible alarmand all external alarm devices that are connected to the relays to turn OFF for a period of time as set bythe SILENCE function (page 22). This will allow ventilation equipment tied to the SPILL and EVAC relaysto continue operating. The front panel ALARM light remains ON, however, as an indication that an alarmcondition still exists, but will automatically turn OFF once the gas level returns to normal. The alarm circuitwill reactivate at the end of the silence period if the detected gas level is still above an alarm level.3.4.3. Viewing the Gas Alarm LogFrom the Data Display screen, use the Keypad buttons to place the arrow (>) on the display next to theALARMS function. Then press ENTER to display the alarm log.The alarm log shows the type of alarm (LEAK, SPILL, or EVAC), plus the date and time it occurred. IfCLEAR is displayed, this indicates that an alarm was acknowledged at the date and time shown.Immediately after selecting the ALARM function, the most recent alarm event is displayed. In the examplebelow, record #03 shows that a Spill Alarm occurred on 11/10/10 at 15:06. Note that if more than30 alarm events have occurred, then the newest event overwrites the oldest. The Alarm Log can becleared as described on page 25.#03 SPILL @11/10/10 15:0614.72 * AMB14.810.0R134A CALFACTOR1.000TEMP AT ZONE =25 degCSQUELCH BELOW50.0ppm