Siemens HydroRanger 200 Instruction Manual download pdf (Page 49)

7ML19981FC01 HydroRanger 200 – INSTRUCTION MANUAL Page 35

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Relays

Temperature

In high alarm, the function goes on when the temperature rises to the ON setpoint and

goes off when the temperature lowers to the OFF setpoint. In low alarm, the function

goes on when the temperature lowers to the ON setpoint and goes off when the

temperature rises to the OFF setpoint.

Loss of Echo

The function goes on when the fail-safe timer expires. The function goes OFF when a

valid echo is received (fail-safe timer is reset).

Pump

Level

In pump down, the function goes on when the level rises to the ON setpoint and goes off

when the level lowers to the OFF setpoint. In pump up, the function goes on when the

level lowers to the ON setpoint and goes off when the level rises to the OFF setpoint.

Miscellaneous

Totalizer and Samplers

Refer to

Totalizing Pumped Volume

on page 58. Relays are normally de-energized, contact

closure is approximately 200 mSec duration.

Setpoint - ON / OFF

If the ON setpoint is higher than the OFF setpoint, the relay operates as:

• high alarm

• pump down control

If the ON setpoint is lower than the OFF setpoint, the relay operates as:

• low alarm

• pump up control

The ON and OFF setpoints can not be the same on an individual relay but may be common

to other relays. The dead band or hysteresis is the difference between the ON and OFF

setpoints. For in and out of bounds level alarms, the hysteresis is set at ±

2 % of span

from either boundary.

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Siemens HydroRanger 200 Instruction Manual Page 49