diff --git a/tecs/make_crv b/tecs/make_crv
index 7b9ad87..76cddf5 100644
--- a/tecs/make_crv
+++ b/tecs/make_crv
@@ -365,6 +365,12 @@ $(CFGDIR)x50991.crv: ccrv inp/x50991.inp
 $(CFGDIR)x51079.crv: ccrv inp/x51079.inp
 	$Q -p$(CFGDIR)
 
+$(CFGDIR)x55606.crv: ccrv inp/x55606.inp
+	$Q -p$(CFGDIR)
+
+$(CFGDIR)x55918.crv: ccrv inp/x55918.inp
+	$Q -p$(CFGDIR)
+
 $(CFGDIR)z030114.crv: ccrv inp/z030114.inp
 	$Q -p$(CFGDIR)
 
@@ -491,6 +497,8 @@ all_crv: dev.list \
   $(CFGDIR)x50923.crv \
   $(CFGDIR)x50991.crv \
   $(CFGDIR)x51079.crv \
+  $(CFGDIR)x55606.crv \
+  $(CFGDIR)x55918.crv \
   $(CFGDIR)z030114.crv \
 
 ALLINP= \
@@ -616,5 +624,7 @@ inp/x50921.inp \
 inp/x50923.inp \
 inp/x50991.inp \
 inp/x51079.inp \
+inp/x55606.inp \
+inp/x55918.inp \
 inp/z030114.inp \
 
diff --git a/tecs/make_gen b/tecs/make_gen
index 4c28d37..4c6dacf 100644
--- a/tecs/make_gen
+++ b/tecs/make_gen
@@ -21,6 +21,8 @@ TECLI_OBJ =tecs_client.o tecs_plot.o str.o instr_hosts.o \
 
 HARDSUPLIB = ../hardsup/libhlib.a
 
+OBJ       = $(SERV_OBJ) $(TECLI_OBJ)
+
 libtecsl.a: $(CLI_OBJ)
 	rm -f $@
 	$(AR) $(ARFLAGS) $@ $Q
@@ -82,4 +84,4 @@ pg_plus/libpgplus.a:
 	cd pg_plus; make $(MFLAGS) 
 
 clean:
-	rm -f *.o *.a six keep_running TecsServer TecsClient
+	rm -f *.o *.a *.d six keep_running TecsServer TecsClient
diff --git a/tecs/makefile_linux b/tecs/makefile_linux
index c47cbe5..7d62e17 100644
--- a/tecs/makefile_linux
+++ b/tecs/makefile_linux
@@ -11,7 +11,7 @@ SICS=..
 
 CC       = gcc
 FC       = g77
-CFLAGS   = -DLINUX -g $(DFORTIFY) -I../.. -I. -Wall -Wno-missing-braces
+CFLAGS   = -DLINUX -g $(DFORTIFY) -I../.. -I. -Wall -Wno-missing-braces -MMD
 FFLAGS   = -Wimplicit -g
 ARFLAGS  = cr
 
@@ -38,3 +38,6 @@ F=$<
 C=$<
 
 include make_gen
+
+-include $(OBJ:.o=.d)
+
diff --git a/tecs/tecs.c b/tecs/tecs.c
index 8b480e4..0593aaf 100644
--- a/tecs/tecs.c
+++ b/tecs/tecs.c
@@ -29,6 +29,8 @@
 #define LSC_CODES "lsc.codes"
 #define LOGLIFETIME 24*3600
 
+#define CELSIUS 2
+
 static SerChannel *ser=NULL;
 static char binDir[256]="";
 static char logDir[256]="";
@@ -109,6 +111,7 @@ static Plug
 static float
   set, /* set T */
   setH, /* set T on heat exchanger */
+  set2, /* set T of seconds loop in two loop mode */
   htr, power=DATA_UNDEF,   /* heater current percentage, heater power */
   tLimit, /* temperature limit */
   tMaxLimit, /* maximal temperature limit */
@@ -170,6 +173,7 @@ static int
   ibuf, /* temporary int. buffer */
   htrst, htrst0, /* heater status */
   loop=1, /* active loop */
+  twoloops=0, /* two active loops */
   touched, /* user touched keys */
   tim0, /* msec Time */
   per, /* effective period */
@@ -181,6 +185,7 @@ static int
   swRangeOn=60, /* when not happen several times within less than 60 sec. delay,
                    switch heater range on when controller switched it off */
   initMaxPower=0, /* set MaxPower for the first time */
+  unit=1, /* 1: Kelvin, 2: Celsius */
   lockAlarm,
   cntError;
 
@@ -444,7 +449,7 @@ int InstalCurve(SensorT *sensor, char *devArg) {
     if (!LscEqPar(buf1, intype) || atoi(buf2)!=num || buf3[0]!='1') {
       ERR_P(LscCmd(ser, "ANALOG 2:0,3;INSET [chan],1"));
       if (chan[1]<='1') ERR_P(LscCmd(ser, "RANGE:0;INTYPE [chan]:[intype]"));
-      ERR_P(LscCmd(ser, "INCRV [chan]:[num];MNMX [chan]:1,1"));
+      ERR_P(LscCmd(ser, "INCRV [chan]:[num];MNMX [chan]:1,[unit]"));
       logfileOut(LOG_MAIN, "curve %d on channel %s selected\n", num, chan);
     } else {
       logfileOut(LOG_MAIN, "curve %d on channel %s is already selected\n", num, chan);
@@ -494,7 +499,7 @@ int InstalCurve(SensorT *sensor, char *devArg) {
 
     /* write header, select curve */
     str_upcase(head, chead);
-    ERR_P(LscCmd(ser, "CRVHDR [num]:[head];INCRV [chan]:[num];MNMX [chan]:1,1"));
+    ERR_P(LscCmd(ser, "CRVHDR [num]:[head];INCRV [chan]:[num];MNMX [chan]:1,[unit]"));
     logfileOut(LOG_MAIN, "curve %d selected on channel %s\n", num, chan);
     saveTime=tim+30;
   }
@@ -502,7 +507,7 @@ int InstalCurve(SensorT *sensor, char *devArg) {
 
   if (sens->scale != 1.0 || sens->kink != 0.0) { /* scaling for display */
     fbuf = sens->kink * (1.0 - sens->scale);
-    ERR_P(LscCmd(ser, "LINEAR [chan]:1,[sens.scale],1,1,[fbuf]"))
+    ERR_P(LscCmd(ser, "LINEAR [chan]:1,[sens.scale],[unit],1,[fbuf]"));
   }
   if (settingsFlag==0) sens->present=1;
   /*
@@ -631,9 +636,11 @@ again:
     keepT=0;
     swRangeOn=60;
     loop=1;
+    twoloops=0;
     initMaxPower=1;
     resist=10;
     nScan=0;
+    unit=1;
   } else {
     InitSensor(&sensC);
     InitSensor(&sensD);
@@ -1038,7 +1045,11 @@ int ReadTemp(void) {
         }
       }
       ibuf = iScan-1;
-      ERR_P(LscCmd(ser, "KRDG?[chan]>fbuf;DOUT 3,[ibuf];XSCAN 1,[iScan];DISPFLD [sens.dispfld],[chan],1"));
+      if (unit == CELSIUS) {
+        ERR_P(LscCmd(ser, "CRDG?[chan]>fbuf;DOUT 3,[ibuf];XSCAN 1,[iScan];DISPFLD [sens.dispfld],[chan],[unit]"));
+      } else {
+        ERR_P(LscCmd(ser, "KRDG?[chan]>fbuf;DOUT 3,[ibuf];XSCAN 1,[iScan];DISPFLD [sens.dispfld],[chan],[unit]"));
+      }
       lastRead = now;
       s->t = fbuf;
     }
@@ -1068,6 +1079,8 @@ int ReadTemp(void) {
         buf[1]='D';
         buf[2]='A';
         buf[3]='T';
+      } else if (unit == CELSIUS) {
+        buf[0]='C'; /* change KRDG to CRDG */
       }
       doit=1;
     }
@@ -1152,6 +1165,8 @@ int ReadTemp(void) {
         if (s->scale > 1.0 && s->kink != 0) {
           if (s->t > s->kink) {
             dispfmt='4';
+          } else if (unit == CELSIUS) {
+            dispfmt='2';
           } else {
             dispfmt='1';
           }
@@ -1321,9 +1336,11 @@ int SetTemp(int switchOn) {
   if (switchOn) {
     /* switch off other loop */
     if (loop==1) {
-      ERR_P(LscCmd(ser, "CSET 2:[chan],1,0,0"));
+      if (twoloops==0) {
+        ERR_P(LscCmd(ser, "CSET 2:[chan],[unit],0,0"));
+      }
     } else {
-      ERR_P(LscCmd(ser, "CSET 1:[chan],1,0,0"));
+      ERR_P(LscCmd(ser, "CSET 1:[chan],[unit],0,0"));
     }
     if (ramp > 0 && set != 0) {
       /* take ramp from actual temperature if more than 10 % deviation */
@@ -1337,31 +1354,43 @@ int SetTemp(int switchOn) {
         fbuf = ctlSens->t;
         tr = TrueScale(ctlSens, fbuf);
         ERR_P(LscCmd(ser, "SETP [loop],[fbuf];RAMP [loop],0,0;SETP [loop],[fbuf]"));
+        if (twoloops) {
+          ERR_P(LscCmd(ser, "SETP 2,[fbuf];RAMP 2,0,0;SETP 2,[fbuf]"));
+        }
       }
     }
   }
   if (set==0) {
     mout=0;
-    ERR_P(LscCmd(ser, "CSET [loop]:[chan],1,1,[keepT];MOUT [loop],0"));
+    ERR_P(LscCmd(ser, "CSET [loop]:[chan],[unit],1,[keepT];MOUT [loop],0"));
+    if (twoloops) {
+      ERR_P(LscCmd(ser, "CSET 2:D,[unit],1,[keepT];MOUT [loop],0"));
+    }
     if (loop==1) {
       ERR_P(LscCmd(ser, "RANGE:0"));
       jRange=0;
+      if (twoloops) {
+        ERR_P(LscCmd(ser, "ANALOG 2:0,0"));
+      }
     } else {
       ERR_P(LscCmd(ser, "ANALOG 2:0,0"));
     }
     setH=0;
   } else if (switchOn) { /* switch on also when bad heater message and no alarms: || (htrst>=5 && !relay))  */
-    ERR_P(LscCmd(ser, "CSET [loop]:[chan],1,1,[keepT]"));
+    ERR_P(LscCmd(ser, "CSET [loop]:[chan],[unit],1,[keepT]"));
     if (loop==1) {
       ERR_P(LscCmd(ser, "RANGE:[iRange]"));
       jRange=iRange;
+      if (twoloops) {
+        ERR_P(LscCmd(ser, "ANALOG 2:0,3"));
+      }
     } else {
       ERR_P(LscCmd(ser, "ANALOG 2:0,3"));
     }
   } else {
     ERR_P(LscCmd(ser, "CSET?[loop]>,buf1,"));
-    if (buf1[0] != '1') {
-      ERR_P(LscCmd(ser, "CSET [loop]:[chan],1"));
+    if (buf1[0] != ('0' + unit)) {
+      ERR_P(LscCmd(ser, "CSET [loop]:[chan],[unit]"));
     }
   }
   showSet=(0!=strcmp(ctlSens->ch, controlChannel) || switchOn);
@@ -1370,10 +1399,16 @@ int SetTemp(int switchOn) {
     ERR_P(LscCmd(ser, "RAMP?[loop]>buf1,"));
     if (buf1[0] != '0') {
       ERR_P(LscCmd(ser, "RAMP [loop]:0,[ramp]"));
+      if (twoloops) {
+        ERR_P(LscCmd(ser, "RAMP 2:0,[ramp]"));
+      }
     }
     ERR_P(LscCmd(ser, "SETP?[loop]>fbuf"));
     if (fabsf(setH-fbuf) >= (fbuf+setH)*1.0e-5) {
       ERR_P(LscCmd(ser, "SETP [loop]:[setH]"));
+      if (twoloops) {
+        ERR_P(LscCmd(ser, "SETP 2:[set2]"));
+      }
       if (!doubleControl && !showSet) {
         logfileOut(LOG_MAIN, "set %g (on %s) (was changed %g -> %g)\n", set, ctlSens->ch, fbuf, setH);
       }
@@ -1400,6 +1435,9 @@ int SetTemp(int switchOn) {
     fbuf = fbuf / ctlSens->scale;
     if (fbuf<0.1) fbuf=0.1;
     ERR_P(LscCmd(ser, "RAMP [loop]:1,[fbuf];SETP [loop],[setH]"));
+    if (twoloops) {
+      ERR_P(LscCmd(ser, "RAMP 2:1,[fbuf];SETP 2,[set2]"));
+    }
     ERR_P(LscCmd(ser, "SETP?[loop]>fbuf"));
     tr=TrueScale(ctlSens, fbuf);
     if (showSet) {
@@ -1617,6 +1655,9 @@ int SetMaxPower(void) {
     cod1=1;
   }
   ERR_P(LscCmd(ser, "CDISP 1:[loop],[resist],1;MOUT [loop]:0;CMODE [loop]:[cod1]"));
+  if (twoloops) {
+    ERR_P(LscCmd(ser, "CDISP 2:3,[resist],1;MOUT 2:0;CMODE 2:[cod1]"));
+  }  
   mout=0;
   jRange=0;
   if (slope<0) slope=-slope;
@@ -1630,6 +1671,9 @@ int SetMaxPower(void) {
       prop=prop*lastCurrent/maxCurrent;
     }
     ERR_P(LscCmd(ser, "CLIMIT 1:[fbuf],[slope],0,[iAmp],[iRange];PID [loop],[prop]"));
+    if (twoloops) {
+      ERR_P(LscCmd(ser, "CLIMIT 2:[fbuf],[slope],0"));
+    }
   } else {
     ERR_P(LscCmd(ser, "CLIMIT 2:[fbuf],[slope],0"));
   }
@@ -1655,7 +1699,7 @@ int ConfigAlarms(float genLimit) {
     if (s->customAlarm==0 && genLimit>0.0) s->alarm=genLimit;
     if (s->present==1 && s->alarm>0) {
       r1=FakeScale(s, s->alarm);
-      ERR_P(LscCmd(ser, "ALARM [buf1]:1,1,[r1],0,1,1"));
+      ERR_P(LscCmd(ser, "ALARM [buf1]:1,[unit],[r1],0,1,1"));
       alarmList[k]=s->ch;
       k++;
     } else if (i != 4) { /* do not switch off A0 alarm */
@@ -1687,7 +1731,7 @@ int DisplayFmt(SensorT *s, SensorT *fields[], int *dispfld) {
     s->dispfmt='4';
   } else {
     if (s->scale == 1.0 || s->kink > 0.0) {
-      s->dispfmt='1';
+      s->dispfmt='0' + unit;
     } else {
       s->dispfmt='4';
     }
@@ -3391,6 +3435,7 @@ int main(int argc, char *argv[]) {
   CocDefFlt(integ,    RW); CocHdl(PidHdl);
   CocDefFlt(deriv,    RW); CocHdl(PidHdl);
   CocDefFlt(set,  RW); CocHdl(SetHdl);
+  CocDefFlt(set2, RW); CocHdl(SetHdl);
   CocDefFlt(ramp, RW); CocHdl(SetHdl);
   CocDefFlt(still, RW); CocHdl(StillHdl);
   CocDefFlt(power, RW); CocHdl(PowerHdl);
@@ -3476,6 +3521,7 @@ int main(int argc, char *argv[]) {
   CocDefInt(manual, RW); CocHdl(ManualHdl);
   CocDefInt(htrst, RD);
   CocDefInt(loop, RW);
+  CocDefInt(twoloops, RW);
   CocDefInt(rdTim, RD);
   CocDefInt(tim0, RD);
   CocDefInt(ibuf, RD);
@@ -3492,6 +3538,7 @@ int main(int argc, char *argv[]) {
   CocDefInt(keepT, RW);
   CocDefInt(swRangeOn, RW);
   CocDefInt(doubleControl, RW);
+  CocDefInt(unit, RW);
 
   CocDefStr(controlSensor, RW); CocHdl(SetHdl);
 
@@ -3638,6 +3685,7 @@ int main(int argc, char *argv[]) {
   ERR_P(DataCreateSet(NULL, "ScanChan", &scanChan, logPeriod, LOGLIFETIME, tim));
   DataUndef(0);
   ERR_P(DataCreateSet(NULL, "Set", &set, logPeriod, LOGLIFETIME, tim));
+  ERR_P(DataCreateSet(NULL, "Set2", &set2, logPeriod, LOGLIFETIME, tim));
   ERR_P(DataCreateSet(NULL, "shiftUp", &shiftUp, logPeriod, LOGLIFETIME, tim));
   ERR_P(DataCreateSet(NULL, "shiftLow", &shiftLow, logPeriod, LOGLIFETIME, tim));
   ERR_P(DataCreateSet(NULL, "state", &state, logPeriod, LOGLIFETIME, tim));