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1.2 System Hardware – Fig. 1.2 1.3 Principle of Operation– Fig. 1.2 The 4680 and 4685 transmitters are part of the EXFG Oxygen The transmitter unit processes a 4 to 20mA (25% to Analyzer System which measures oxygen content and 0.25% O...
1000m (3281 ft) max. A – Maximum Distance Between Instrument and Interface Unit Fig. 2.1 Checking the Code Number (Model 4680) 2.1.2 Panel-mounted Instruments – Fig. 2.2 55°C Max. –20°C Min.
Information. • The M20 glands ready-fitted to wall-mounted instruments accept cable of between 4 and 7mm diameter. • A spare set of grommets is supplied for cable sizes between 8 and 12mm diameter. 4680 Signal Cable 4685 Mains power cable...
4 ELECTRICAL CONNECTIONS… 4.1.2 Relay Contact Protection and Interference Suppression – Fig. 4.1 If the relays are used to switch loads on and off, the relay contacts can become eroded due to arcing. Arcing also generates radio frequency interference (RFI) which can result in instrument malfunctions and incorrect readings. To minimize the effects of RFI, arc suppression components are required;...
…4 ELECTRICAL CONNECTIONS 4.4 Selecting the Mains Voltage 4.4.1 Wall/Pipe-mounted Instruments – Fig. 4.6 Remove cap and screw Information. Use a small, Remove front panel flat-bladed screwdriver to remove the screw cap from the case. Slacken captive screws and remove protection cover Select the mains voltage required...
5 CONTROLS AND DISPLAYS 5.1 Displays – Fig. 5.1 5.2 Switch Familiarization The display comprises a 5-digit, 7-segment digital upper display line and a 16-character dot-matrix lower display line. The upper Advance to display line shows actual values of oxygen, alarm set points or next page programmable parameters.
6 OPERATION 6.1 Instrument Start-up Ensure all electrical connections have been made correctly and switch on. 6.2 Operating Page The Operating Page is a general use page in which parameters are viewed only and cannot be altered. To alter or program a parameter refer to the programming pages in Section 7.
7 PROGRAMMING Set Up Outputs Page Operating Page Access to Secure Parameters Section 7.3, Page 16 Section 6.2, Page 14 Section 7.1, Page 15 xx. x 00000 ----- ----- % Oxygen SECURITY CODE ELECTRICAL CAL SET UP OUTPUTS xx. x ----- ----- Alarm Setpoint...
…7 PROGRAMMING 7.3 Set Up Outputs Page Set Up Outputs ----- Page header SET UP OUTPUTS Alarm Action ----- Set the required alarm action from the following table. Alarm Action The set point band is defined as the actual value of the set point plus or minus the hysteresis value.
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