Due to continuous improvement, TRIATEK reserves the right to change product specifications without notice.
Due to continuous improvement, Triatek reserves the right to change product specifications without notice.
an accurate face velocity reading. This sidewall sensor comes pre-
configured and pre-calibrated with the fume hood controller. However,
it must be calibrated to the fume hood it has been installed in to be
monitored and/or controlled. If a sash position sensor was included with
the HMS-1655L, then it must also be recalibrated following installation.
The field calibration menu options can be found on the
Fume Hood
Setup
menu as shown in Figure 4.
Calibrating the Sidewall Sensor
To calibrate the sidewall sensor, perform the initial zeroing procedure
followed by the gain and offset setting step.
Initial Zeroing
Enter the HMS-1655L user menus and select the
Unit Setup
option from
the
Main Setup
menu. Select the
Hood Setup
menu. After the sidewall
sensor and the controller have been installed, the first field calibration
may require that the sensor output be zeroed relative to its associated
controller. This would not necessarily be required for future calibrations
of the same sensor / controller pair. To do this select the
Zero Calibration
option on the second page of the menu. This will require that the sensor
be capped off to prevent any air movement or pressure from being
measured, just the zero output value.
The sensor must be capped inside the hood, and if the sensor is not
directly attached to the side of the hood with the sensor “nipple” inside
the hood, but uses tubing to connect the sensor to the inside of the
hood, then both the tube end inside the hood and the tube end at the
reference plate must be capped or sealed to get an accurate zero
reading. Follow the onscreen instructions and wait the required settling
delays to take a Zero sensor reading.
Gain and Offset Setting
Following this, and for subsequent field calibrations, select the
Field
Calibration
menu item under the
Hood Setup
menu. The on screen
instructions will direct you to cap the sensor inside the hood. The
capping procedure should be the same as per the zero calibration
procedure, in that both ends of the sensor tubing will need to be
capped if the sensor is not directly attached to the hood sidewall with
the sensor “nipple” inside the hood.
Wait at least 10 seconds for the sensor output and the filtered value in
the controller to settle. Tap the
Next
button to accept this and move to
the next step in the calibration. Be sure to remove the cap(s) from the
sensor and set the sash to the operating height (18 inches typically).
Do a traverse of the hood face, directly in the same plane as the sash,
and accumulate an accurate indication of the actual hood face velocity
using a accurate velocity meter. If the hood valve is not at a position
to give sufficient air or gives too much air to get an accurate actual air
flow reading, adjust the
Override
slider to position the valve to a better
setting. Tap the
Next button
and enter the actual air velocity value on
the display screen by using the input slider. Tap the
Finish
button to
complete the calibration.
QUICK START GUIDE
-
28
-
HMS-1655L
Figure 3. When the
face velocity drifts
outside the normal
operating range,
the main display
background turns
yellow to indicate a
warning condition.
Figure 4. This menu
provides options
for recalibrating the
sidewall sensor and
sash position sensor,
as well as configuring
the target setpoints for
each operating mode.
HMS-1655L Quick Start Guide
Triatek reserves the right to change product specifications without notice.
