I have started a SenseMon instance running on the dewhitened H1:OAF-CAL_DARM_DQ channel. The lock detection uses the guardian ISI lock channel as recommended by Jamie. I have set up a dmtviewer configuration to plot both the L1 and H1 ranges. The dmtviewer file is in 

   /opt/rtcds/userapps/release/isc/h1/scripts

and is called HL-Range.xml. I also added a script to set the DMTWEBSERVER environment variable so that it can find the web servers at both observatories. This is in the same directory and can be run from bash with 

   cd /opt/rtcds/userapps/release/isc/h1/scripts
  source dmtvsetup 

Then run dmtviewer with e.g.

  dmtviewer HL-Range.xml &

Note that this requires kerberos authentication so you must kinit and supply a key tab or username/password.