3 of 14 2 Designated Use The GMH 3611 is measuring dissolved oxygen in Water. The measuring is performed by means of a suitable oxygen sensor (included in supply in standard instrument) connected to the Mini-DIN socket, the sensor measures at the membrane at the tip of the sensor.
H74.0.04.6C-06 Operating Manual GMH 3611 page 4 of 14 4 Product Description 4.1 Scope of supply The scope of supply includes: GMH 3651 with 9V-battery Operating Manual The necessary oxygen sensor is chosen separately due to application. 4.2 Operation and maintenance advice 1.
H74.0.04.6C-06 Operating Manual GMH 3611 page 5 of 14 4.4 Connections Output: Operation as interface for t he connection of galvanically isolated adapters (accessories: GRS 3100, USB 3100) Attention: The mode of operation has to be configured (p.r.t Chapter 5) and influences the power consumption.
H74.0.04.6C-06 Operating Manual GMH 3611 page 6 of 14 4.7 Pop-up clip Handling: • Pull at label “open” in order to swing open the pop-up clip. • Pull at label “open” again to swing open the pop-up clip further. Pop-up clip closed Pop-up clip at position 90°...
H74.0.04.6C-06 Operating Manual GMH 3611 page 7 of 14 5 Configuration Some menu points depend on current device settings. To change device settings, press „Menu“ Store for 2 seconds. This will activate the configuration menu (main Menu Quit Store display: “Set”). Pressing „Menu“...
H74.0.04.6C-06 Operating Manual GMH 3611 page 8 of 14 6 The Oxygen Sensor 6.1 Design of Sensor GWO 3600 General information The oxygen electrode is an active electrode consisting of a silver cathode and a lead anode with the electrolyte being potassium hydroxide (KOH). In case of oxygen being present it will be reduced at the silver cathode, i.e.
H74.0.04.6C-06 Operating Manual GMH 3611 page 9 of 14 Oxygen Measuring - please note Please observe the following points when measuring dissolved oxygen: - For measuring remove the protective flask. - Do not disconnect electrode from device. If electrode has been disconnected, wait 2 - 3 hours till the final electrode signal has settled before carrying out measurements or a calibration.
H74.0.04.6C-06 Operating Manual GMH 3611 page 10 of 14 Air calibration without accessories ('Cal Air') 100% The electrode will be exposed to ambient air. To protect it 5 °C 1.007 1.005 1.003 1.002 1.00 from draughts, wrap electrode in a paper towel. (before 10 °C...
H74.0.04.6C-06 Operating Manual GMH 3611 page 11 of 14 9 Inspection of the accuracy / Adjustment Services The instrument can be sent to the manufacturer for adjustment and function test. Only the manufacturer can check all systems on correct them if necessary.
H74.0.04.6C-06 Operating Manual GMH 3611 page 12 of 14 11 Error and System Messages Display Meaning Remedy low battery voltage, device will continue to work replace battery for a short time If mains operation: wrong voltage replace power supply, if fault continues to...
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