Ashcroft ATE-100 Handheld LCD Digital Calibrator - Manual (Page 29)

- 29 -
Revision 4.6 3/2004
UnIT key. Details on engineering unit selection are
provided in Section 8.0 of this manual.
Important Note: The HHC must be set up for pressure
measurement first. With pressure measurement set up,
deactivate the side of the display to remain in pressure
mode prior to setting up the desired flow measurement
parameters. If flow measurement is set up before pres-
sure measurement access to pressure engineering units
will be lost. When set up to measure both pressure and
flow engineering units for both measurements can be
accessed as outlined in Section 8.4.
Step 2 Use the port select key to deselect the displayed
output of pressure from the module which is to be left in
the pressure readout mode of operation. When a module
is deselected the corresponding side of the display on the
HHC will read milliamp (mA), blank “---- ’’ or Volts (V).
Press the port select key one time to deselect the right
module. Press the port select two times to deselect the
left module.
PORT
SEL
Step 3 With the desired pressure module deselected
follow the procedure outlined in Section 14.2 if the flow
measurement is to be flow velocity or Section 14.4 if the
flow measurement is to be a flow volume measurement.
Step 4 As outlined in Section 14.2 for flow velocity or
Section 14.4 for flow volume select the desired engineer-
ing unit.
Step 5 With the display for the active flow measure-
ment correct, reactivate the deactivated port using the
port select function.
PORT
SEL
Note: The units used to express flow measurement may
be changed at any time while the HHC is displaying
any flow measurement data. Simply use the engineering
unit select function as described in Section 14.2 for flow
velocity and Section 14.4 for flow volume.
To Exit Flow Measurement and Return to Basic Pressure
Measurement Press the Clear Entry Key (CE).
Section 14.8 Simultaneous Display of
Measurement Data for Flow
(Volume or Velocity) and
Temperature
The HHC can simultaneously display a flow measure-
ment from one installed Quick Select pressure module
and a temperature measurement from a second installed
Quick Select module. For example, the measurement of
flow can be displayed in ft/min for one installed Quick
Select pressure module and the second installed pres-
sure module can be used to simultaneously display the
temperature measurement value in degrees Celsius or
Fahrenheit. This ability eliminates the need for “on-the-
fly” change between flow and temperature measurement
functions when doing airflow testing.
To set the HHC up to present simultaneous display of
temperature and flow (velocity or volume) data follow
the steps below.
Step 1 With the HHC turned off install the required
differential pressure module and temperature measure-
ment interface module.
Step 2 Turn the HHC on.
Step 3 As outlined in Section 16 or 17 set up the
temperature measurement function via the submenu
accessed via the main Set Up menu. See Section 16 or
17 for instructions on setting up the HHC for tempera-
ture measurement using an RTD temperature probe.
Step 4 With the side of the display to be used for flow
measurement active and reading the measured pressure
from a dual process connection type Quick Select pres-
sure module press the FLOW key.
FLOW
Proceed as directed in Section 14.2 for flow velocity and
14.4 for flow volume measurement.
Note 1: The units used to express flow measurement
may be changed at any time while the HHC is displaying
any combination of flow and temperature measurement
data. Simply use the engineering unit select function as
described in Section 14.2 for flow velocity and Section
14.4 for flow volume.
Note 2: Units for display of temperature measurement
data can be changed at any time via the “RTmodule”
menu in the setup menu of the calibrator.
To Exit Flow Measurement and Return to Basic Pressure
Measurement Press the Clear Entry Key (CE).
Section 14.9 Simultaneous Display of Flow
Volume and Flow Velocity
The HHC can simultaneously display flow measurement
data from two installed differential low pressure Quick
Select modules with one output displayed in terms of
flow volume and the other pressure measurement dis-
played in terms of flow velocity. For example, the measure-
ment of flow can be displayed in ft/min for one installed
Quick Select module and ft
3 /min for the second installed