User Guide
Operating Instructions αlpha-RES1000
14
4) Proceed to 7.3.4, or return Measurement mode by pressing ∆ and ∇ keys simultaneously
(escape).
7.3.4 Selecting a hysteresis (dead band) value (0.000 to 0.200 mΩ or 0.00 to 2.00 mΩ)
Hysteresis prevents rapid contact switching if the value is fluctuating near the set point. It does this by
overshooting the set point value to a specified hysteresis value (default is 0.20 mΩ). You can set the
hysteresis value from 0.000 to 0.200 mΩ or 0.00 to 2.00 mΩ.
Example: Set point 1 (Lo) is at 1.00 mΩ and hysteresis limit value is at 0.20 mΩ. If measured value
undershoots low set point of 1.00 mΩ, 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 mΩ. When
the value has increased to 1.20 mΩ, relay, and hence the pump will switch off.
1) Follow directions in 7.3.1 to enter Control Relay mode.
2) Push the ENTER key. The upper display shows the hysteresis
(dead band) value and the lower display shows “HYS”.
3) Press ∆ 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 ∆ 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.
2) Push the ENTER key. The upper display shows “0” time and
the lower display shows “On.d”.
3) Press the ∆ 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 ∆ and ∇ keys simultaneously
(escape).
20
µS
HYS
HOLD SETUP
0
On.d
HOLD SETUP