catch the case when sensirion is not working

- add use_pressure to nv control for selecting whether nv control
  is using the flow from the sensirion sensor or the pump pressure
- this is triggered when sensirion is reading 0 (incl. stddev)

tcl/startup/ccu4make.tcl

@@ -20,13 +20,14 @@ proc makeCCU4 {args} {
   set badargs [list]
   set cfgdev "0"
   set hepump 0
+  set sensirion [silent 0 result instconfig sensirion]
   foreach arg $args {
     switch $arg {
       nv - nv_release_blocked {
         if {$arg eq "nv_release_blocked"} {
-          makenv nv -driver ccu4flow release_blocked
+          makenv nv -driver ccu4flow release_blocked $sensirion
         } else {
-          makenv nv -driver ccu4flow
+          makenv nv -driver ccu4flow $sensirion
         }
 #        GraphAdd cc.f mbar nv_flow red
         GraphAdd nv.flow ln/min nv_flow magenta
@@ -117,6 +118,7 @@ proc makeCCU4 {args} {
   }
   if {$hepump} {
     makeHePump
+    hsetprop /nv hepump /hepump
   }
   set cfg [ccu4_get_device_config $cfgdev codesfile]
   if {$cfg eq "" || [llength $badargs] > 0} {