diff --git a/site_ansto/instrument/sans/config/hmm/ordela_detector_config.tcl b/site_ansto/instrument/sans/config/hmm/ordela_detector_config.tcl
index 01d50e3e..c46e1d01 100644
--- a/site_ansto/instrument/sans/config/hmm/ordela_detector_config.tcl
+++ b/site_ansto/instrument/sans/config/hmm/ordela_detector_config.tcl
@@ -15,15 +15,20 @@ fileeval $cfPath(hmm)/sct_orhvps_common.tcl
 #dhv1 lower 19
 #dhv1 upper 59
 
-# 22/6/2011
+# MJL 30/7/13 NOTE:  Settings below reflect the manufacturer-recommanded voltages set at last service by Ordela.
+
+# S/N 006 last serviced 23 Apr 2012, recommended voltage 2100V.
 set dhv1Max_SN006 2405
 set upper_SN006 55
 
-set dhv1Max_SN003 2600
-set upper_SN003 57
+# S/N 003 last serviced 31 May 2011, recommended voltage 2300V.
+# Observed a setting of 61 gives 2294V on the voltage monitor, implying a max voltage of 2370V.
+set dhv1Max_SN003 2370
+set upper_SN003 61
 
-set dhvMax   $dhv1Max_SN006
-set dhvUpper $upper_SN006
+# At 30/7/13, S/N 003 is installed on Quokka (S/N 006 electronics failed, being repaired at ANSTO)
+set dhvMax   $dhv1Max_SN003
+set dhvUpper $upper_SN003
 
 set host [dict get $::HISTMEM_HOSTPORT ORDELA HOST]
 set port [dict get $::HISTMEM_HOSTPORT ORDELA PORT]