Thermo Fisher Scientific Alpha DO 1000 User Manual

Page 32

5. Press

the ENTER key to confirm your selection.

6. Proceed to 7.6.5, or return to Measurement mode by pressing the

▲ and

▼ keys simultaneously (escape).

7.6.5

Maximum Pulse Length (tPL) or Maximum Frequency (FPF)

Note: If the controller type “oFF” is set, the parameters listed in 7.6.3,

7.6.4, and 7.6.5 are blanked out.

This mode lets you set the maximum pulse length or the maximum frequency at
which the relay will operate.

1. Follow directions in 7.6.1 to enter Controller mode.

2. Press

the ENTER key. Scroll until the lower display

shows “t.PL” or “F.PF”.

3. In PLC (pulse length) mode: The lower display

shows “t.PL” to indicate pulse length. The upper
display shows your current pulse length. You can
select any value from 0.5 to 20 seconds.

4. In PFC (pulse frequency) mode: The lower display

shows “F.PF” to indicate pulse frequency. The
upper display shows your current maximum pulse
rate. You can select any value from 60 to 120
pulses per minute. When the measured value
exceeds the Proportional Band in 7.4.4, the
controller will pulse the relay at this rate.

5. Press

the

▲ or ▼ key to choose the period

duration or maximum frequency, depending on your mode.

6. Press

the

ENTER key to confirm your selection and to return to Advanced

Set-up mode, or return to Measurement mode by pressing the

▲ and ▼

keys simultaneously (escape).

Note: The alarm contact is always of the fail-safe type. In the event of

power failure the alarm is triggered.

HOLD

SETUP

10.0

f.pf

Pulse Length (PLC) mode

Pulse Frequency (PFC) mode