Thermo Fisher Scientific Alpha RES 1000 - Manual (Page 21)

Operating Instructions Alpha RES 1000
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Example: Set point 1 (Lo) is at 1.00 m Ω and hysteresis limit value is at 0.20 mΩ. If measured value
undershoots low set point of 1.00 m Ω, relay activates, which in turn activates an external device such as a
pump or valve. Actions of the external device will cause the value to rise above 1.00 m Ω. When the value has
increased to 1.20 m Ω, relay, and hence the pump will switch off.
1) Follow directions in 7.3.1 to enter Control Relay mode.
20
HYS
HOLD SETUP 2) Push the ENTER key. The upper display shows the hysteresis (dead
band) value and the lower display shows “HYS”.
μS
3) Press Δ or ∇ keys to enter hysteresis value for Set point 1 (Set point 2).
Controller will activate at the value selected. Note: All settings for SP1 and
SP2 are completely independent of each other.
4) Press ENTER key to confirm your selection.
5) Proceed to 7.3.5, or return to Measurement mode by pressing the
Δ and ∇ keys simultaneously (escape).
NOTE: Please refer to Appendix 4 for a graphical representation of the Hysteresis .
7.3.5 Setting an on-delay time lag
You can set as time delay for each relay, which stops the relay from switching on the moment the set point is
exceeded. This controller lets you set a 0 to 1999 seconds time delay before the relay activates.
1) Follow directions in 7.3.1 to enter Control Relay mode.
0
On.d
HOLD SETUP
2) Push the ENTER key. The upper display shows “0” time and the lower
display shows “On.d”.
3) Press the Δ or ∇ keys to enter on-delay time for Set point 1 (Set point
2). The controller will delay activation for the number of seconds (0 to
1999) you select.
4) Press the ENTER key to confirm your selection.
5) Proceed to 7.3.6, or return to Measurement mode by pressing the
Δ and ∇ keys simultaneously (escape).