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Hydran* 201i Instruction Manual
4. Digital Display Circuit Board Cover: This cover protects the display circuit board,
which includes the digital voltmeter and the connections of the two push-buttons.
5. Electronic Circuit Board: The circuit board incorporates all the electronic functions
of the H201Ci-1: H201Ti TDM pulse decoder, alarm relay drivers, configurable
analog output amplifiers, display signal conditioning, supervisory link supply,
communication ports and modem (optional) management, enclosure heater
control, and ac supply voltage selector. See Appendix C.3 for a simplified block
diagram of the circuit.
6. Main Terminal Block: The ac power supply, the analog output, the three alarm
relays (Alarm 1 = Gas High, Alarm 2 = Gas High-High, and System OK), the
supervisory link cables and the RS-485 LAN are connected to this 40-screw
terminal block. For wiring details, see Table D - 11 in Appendix D.
WARNING
MA-033
Rev. 14.0, 12-Nov-18
Figure 4-6: Internal View of Hydran 201Ci-1
Voltage of 115 or 230VAC is present on several
connecting screws of this terminal block.
Page 51
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