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2 manual relay mode, Anual relay mode – Thermo Fisher Scientific Alpha pH 2000D User Manual

Page 34

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7.2

Manual relay mode

In manual relay mode, you can manually turn “on” and “off” the control devices connected to Relay A,
Relay B or Wash relay.

1. While in Measurement mode press the MODE key.

2. The display prompts you to enter the security code. Press the

▲ or ▼ key to set security code to “22”.

3. Press the ENT key. The Manual relay mode is activated and the relay mode LED “Manu” lights.

Note: Pressing ENT key at a value other than “22” will cause the transmitter to revert to
Measurement mode, and the relays will remain in automatic mode.

4. Press the REL key to select either Relay A, Relay B or Wash relay. The corresponding LED (A, B, or W)

turns to red.

The manual control options now available depend on the control type (limit, pulse frequency, or pulse
length) you selected and set in section 6.5.

pH

off

SETUP

HOLD

off

If you selected Limit control: The display shows the current measured value
and “OFF” or “ON” depending on the relay status of the currently selected
relay.

pH

SETUP

HOLD

o

If you selected Pulse length control: The display shows the current
measured value (upper value) and the on time as a percentage of the
current duration set in the CNTR sub-function in setup mode (lower value).

If you selected Pulse frequency control: The display shows the current
measured value (upper value) and the pulse frequency (lower value).

pH

SETUP

HOLD

o

5. Press the

▲ or ▼ key to change the Relay on/off status, pulse length, pulse frequency or wash function.

The relay status LED at the right of the transmitter will also change from Red to Green.

Note: Note: If you wish to manually change the status of relays, press the REL key at this
point and repeat step 5 for the other two relays. The relay(s) will remain under manual
control while you are setting a relay.

6. Press the MODE key to return to Measurement mode. The relays are now back to automatic control.

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