Bronkhorst MASS-VIEW Series - Manual (Page 18)

BRONKHORST HIGH‐TECH
Page 18 MASS‐VIEW® series 9.17.051
Mode (FlowDDE parameter 156)
With the “mode” parameter the user can choose if the alarms reset automatically or manually.
When the reset mode is set to automatic, the alarms will be reset when measure reaches the desired
level and the delay time has exceeded.
When the reset mode is manual, the user can reset the alarms in the following ways:
1. With the “reset” option in the alarms menu.
2. Via RS‐232 (or FLOWDDE / FlowView / FlowPlot).
Writing the value “2” to FLOWDDE parameter 114 resets the alarms.
3. When the readout screen is visible and an alarm is active, this will be displayed at the top of the
screen (see chapter 3.4.7). By pressing up at an alarm situation, the user can reset the alarms
from the readout screen.
Relay
The relays parameter sets the output mode of the relays. The user can choose between disabled,
enabled and pulse. When a relay is active, the relay contact will connect to the 0V signal.
3.4.7 Alarm outputs
The status of the alarms can be read in various ways.
For example when the minimum and maximum alarms are enabled this is
made visible in the readout screen with two markers at the left of the
graph (see picture on the right).
When an alarm arises the corresponding marker will be highlighted and
the header will blink and display the alarm.
The MASS‐VIEW
®
meters have two relays which indicate an alarm situation.
The status of the relays depend on the alarm source and status of the
relay parameter (see table below).
disable enable pulse
Relay 1 Relay 2 Relay 1 Relay 2 Relay 1 Relay 2
Min alarm 0 0 1 0 0/1/0/1/0/1… 0
Max alarm 0 0 0 1 0 0/1/0/1/0/1…
Response (min) 0 0 1 1 0/1/0/1/0/1… 0/1/0/1/0/1…
Response (max) 0 0 1 1 0/1/0/1/0/1… 0/1/0/1/0/1…
Counter 0 0 1 1 0/1/0/1/0/1… 0/1/0/1/0/1…
3.4.8 User tag
The User tag can be edited at the menu item info.
3.5 Other gases
The MASS‐VIEW
®
series are calibrated on Air. All other pre‐installed gases are calculated using a
theoretical conversion model which describes the flow curve for other gases which will introduce
additional inaccuracies.
However, as the accuracy of the conversion model also depends on viscosity, pressure and temperature,
special attention should be taken for gases in the heterogeneous gas state where specific heat, density,
thermal conductivity and viscosity can vary tremendously.
3.6 Zeroing procedure
The MASS‐VIEW
®
has a zero procedure for each individual gas. The zero function permits the user to
zero the instrument when needed. Please make sure the instrument is zeroed on the desired gas at the
desired operating temperature and pressure conditions. It is extremely important that all flow be
blocked and the MASS‐VIEW
®
is in a static (NO FLOW) condition. Select from the main Menu Option ‐>
Fluidset ‐> Zero. Pause a few seconds, then press any key to complete the zero procedure.