Hart Tm; Basic Setup And Initial Pressure Generation; Measuring Pressure - WIKA Wally Box III CPH7600 Betriebsanleitung

6 Commissioning, operation
TM
6.4.8 HART -Resistor
An internal 250 Ω HART
measure-24V" mode. This allows a HART Communicator to be connected across the mA terminals
and eliminates the need for adding an external resistor.
GB
When the HART
6.5

Basic Setup and initial pressure generation

1. The CPH7600 is supplied with a special low-volume calibration hose to enable faster pressure
generation and quick pressure stabilisation. Included in delivery are "Quick-fit" hose connectors
and various adapters. It is recommended that this hose is used in order to achieve the best
results. As soon as the fittings are installed and the calibrator is connected to the test item the
calibrator is ready for use.
2. The pressure calibrator must be configured for the appropriate application (see chapter 6).
3. Set the pressure/vacuum selection knob to the desired function
(+ for pressure and - for vacuum).
4. Close the vent knob.
5. Press the pump key and monitor the pressure rise (or vacuum generation) until you reach the
desired pressure.
The motor speed will start slowly while the pressure is low (< 1 bar) to enable better
control at low pressures.
6. The fine pressure adjustment enables the pressure to be set precisely.
7. To reduce or bleed off the pressure entirely slowly rotate the vent knob to the open position.
The pressure reduction is best controlled if this step is carried out carefully and it makes
reading the pressure easier.
6.6

Measuring pressure

For pressure calibration, connect the calibrator with an appropriate adapter. Select the pressure
setting for the display being used. The calibrator is equipped with an internal sensor and optional
external sensors are available. Choose a sensor that is suitable for the pressure range and
accuracy.
CAUTION!
Pressure sensors may be damaged and/or injuries may occur to the personnel due to
improper application of pressure. For a better understanding with respect to
overpressure and burst pressure, follow the specifications laid down in these operating
instructions (see chapter "3. Specifications"). The calibrator display will indicate "OL"
when an inappropriate pressure is applied. As soon as "OL" is observed on any
pressure display, the pressure should be reduced immediately to prevent damage or
possible physical injury. "OL" is displayed if the pressure exceeds the nominal range
by 110 %. Use the ZERO key to zero the pressure sensor once it is vented to
atmospheric pressure.
24
TM
resistor can be enabled when the CPH7600 is operated in the "mA
TM
resistor is enabled, the maximum load driving capability is 750 Ω.
WIKA Operating Instruction, Model CPH7600