Ashcroft ATE-100 Handheld LCD Digital Calibrator - Manual (Page 33)

- 33 -
Revision 4.6 3/2004
of the HHC.
LEAK
The HHC will display:
Timing eng unit
sec xxxxx
where:
Timing indicates that the HHC is timing the desired
monitoring interval.
sec = the remaining time left to be monitored.
eng unit = the engineering unit in use for the selected
module.
xxxxx = the current pressure measured by the selected
pressure module.
For Pressure Decay Testing – at the end of the test the
HHC will display the following:
Eng Unit Decay
cccc xxxx
where:
Eng Unit = the engineering unit of the measured value.
cccc = current pressure measurement for the
selected pressure module.
xxxx = the measured pressure change during pres-
sure decay test.
For Leak Rate Testing – at the end of the test the HHC
will display the following:
Eng Unit cc/sec
cccc xxxx
where:
Eng Unit = the engineering unit of the current pressure
measurement value.
cccc = current pressure measurement for the
selected pressure module.
xxxx = the measured leak rate over the test interval.
To resume basic pressure measurement press the clear
entry (CE), enter (E) key or any of the four arrow keys.
Pressing any function key will activate that selection.
For example, pressing the engineering unit select key
(EnG UnIT) will activate the engineering unit selection
program.
Important Note: After completing leak testing the HHC
will display pressure measurement data for the module
that was used in the testing process and will display “--
--- “ on the other side of the display. If a second module
is installed in the other sensor bay it can be re-selected
using the port select function (PORT SEL) as detailed in
Section 5.0.
Section 16.0 Temperature Measurement using
RTD Probes
The HHC can be used with most standard RTDs (Resis-
tance Temperature Detectors) to provide precision tem-
perature measurements. An GQS-RT type Quick Select
module is needed in order for the HHC to perform
temperature measurement with an RTD. The GQS-RT
provides the interface between the calibrator base unit
and the RTD probe. There are two GQS-RT Quick
Select modules available in order to provide support for
the most common RTD resistance levels.
The capabilities of the modules are summarized below:
GQS-RT1 Quick Select Module
Pt 100
(385 & 392):
–200 to 550° C: +0.15° C
550 to 850° C: +0.2° C
Ni 120: 80 to 260° C: +0.1° C
Cu 10: 70 to 150° C: +0.6° C
Ohms: +0.01% reading +0.02 ohms
GQS-RT2 Quick Select Module
Pt 1000: 184 to 275° C: +0.15° C
Ohms: +0.01% reading +0.2 ohms
Engineering Units:
Fahrenheit, Celsius, Kelvin, Rankine
or ohms
Ohms Measurement Range:
GQS-RT1 module: 0/400 ohms
GQS-RT2 module: 0/4000 ohms
The interface module incorporates a Switchcraft TA4M
type connector and requires an RTD with the appropriate
Switchcraft TA4F meeting connector. The connector is
available through the supplier of your calibrator.
Section 16.1 Setting Up the Calibrator for
RTD Temperature Measurement
Step 1 With the instrument off install the appropriate
GQS-RT Quick Select RTD interface module. Instruc-
tions for installation of a Quick Select module
Step 2 Connect the desired RTD probe to the Switch-
craft connector on the module
Step 3 Turn the calibrator on by pressing the On/Off key.