diff --git a/pytec/pytec/gui/view/param_tree.json b/pytec/pytec/gui/view/param_tree.json
index 64b9839..3beb9d3 100644
--- a/pytec/pytec/gui/view/param_tree.json
+++ b/pytec/pytec/gui/view/param_tree.json
@@ -37,7 +37,7 @@
                    null,
                    [
                       "pwm",
-                      "ch",
+                      "$ch",
                       "pid"
                    ]
                 ],
@@ -58,7 +58,7 @@
                       "compactHeight":false,
                       "param":[
                          "pwm",
-                         "ch",
+                         "$ch",
                          "i_set"
                       ],
                       "tip": "Set current through output",
@@ -78,7 +78,7 @@
                       "compactHeight":false,
                       "param":[
                          "pid",
-                         "ch",
+                         "$ch",
                          "target"
                       ],
                       "tip": "Set target temperature",
@@ -106,7 +106,7 @@
                       ],
                       "param":[
                          "pwm",
-                         "ch",
+                         "$ch",
                          "max_i_pos"
                       ],
                       "tip": "The maximum cooling (+ve) current through the output pins",
@@ -126,7 +126,7 @@
                       ],
                       "param":[
                          "pwm",
-                         "ch",
+                         "$ch",
                          "max_i_neg"
                       ],
                       "tip": "The maximum heating (-ve) current through the output pins",
@@ -146,7 +146,7 @@
                       "compactHeight":false,
                       "param":[
                          "pwm",
-                         "ch",
+                         "$ch",
                          "max_v"
                       ],
                       "tip": "The maximum voltage across the output pins",
@@ -177,7 +177,7 @@
                 "compactHeight":false,
                 "param":[
                    "s-h",
-                   "ch",
+                   "$ch",
                    "t0"
                 ],
                 "tip": "The origin temperature for the B-Parameter equation",
@@ -193,7 +193,7 @@
                 "compactHeight":false,
                 "param":[
                    "s-h",
-                   "ch",
+                   "$ch",
                    "r0"
                 ],
                 "tip": "The origin resistance for the B-Parameter equation",
@@ -209,7 +209,7 @@
                 "compactHeight":false,
                 "param":[
                    "s-h",
-                   "ch",
+                   "$ch",
                    "b"
                 ],
                 "tip": "The B-Parameter",
@@ -222,7 +222,7 @@
                 "value":16.67,
                 "param":[
                    "postfilter",
-                   "ch",
+                   "$ch",
                    "rate"
                 ],
                 "limits":{
@@ -253,7 +253,7 @@
                 "compactHeight":false,
                 "param":[
                    "pid",
-                   "ch",
+                   "$ch",
                    "kp"
                 ],
                 "tip": "Proportional gain",
@@ -268,7 +268,7 @@
                 "compactHeight":false,
                 "param":[
                    "pid",
-                   "ch",
+                   "$ch",
                    "ki"
                 ],
                 "tip": "Integral gain",
@@ -283,7 +283,7 @@
                 "compactHeight":false,
                 "param":[
                    "pid",
-                   "ch",
+                   "$ch",
                    "kd"
                 ],
                 "tip": "Differential gain",
@@ -309,7 +309,7 @@
                       "compactHeight":false,
                       "param":[
                          "pid",
-                         "ch",
+                         "$ch",
                          "output_min"
                       ],
                       "tip": "Minimum PID output",
@@ -328,7 +328,7 @@
                       "compactHeight":false,
                       "param":[
                          "pid",
-                         "ch",
+                         "$ch",
                          "output_max"
                       ],
                       "tip": "Maximum PID output",
@@ -353,7 +353,7 @@
                       "compactHeight":false,
                       "pid_autotune":[
                          "target_temp",
-                         "ch"
+                         "$ch"
                       ],
                       "tip": "The target temperature to autotune for"
                    },
@@ -371,7 +371,7 @@
                       ],
                       "pid_autotune":[
                          "test_current",
-                         "ch"
+                         "$ch"
                       ],
                       "tip": "The testing current when autotuning"
                    },
@@ -386,7 +386,7 @@
                       "compactHeight":false,
                       "pid_autotune":[
                          "temp_swing",
-                         "ch"
+                         "$ch"
                       ],
                       "tip": "The temperature swing around the target"
                    },
@@ -400,7 +400,7 @@
                      "compactHeight":false,
                      "pid_autotune":[
                         "lookback",
-                        "ch"
+                        "$ch"
                      ],
                      "tip": "Amount of time to lookback"
                   },
diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index 248fe04..bfd39b0 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -271,7 +271,7 @@ class MainWindow(QtWidgets.QMainWindow):
                         data /= 1000  # Given in mA
 
                     thermostat_param = inner_param.opts["param"]
-                    if thermostat_param[1] == "ch":
+                    if thermostat_param[1] == "$ch":
                         thermostat_param[1] = ch
 
                     if inner_param.name() == "rate" and data is None:
@@ -284,7 +284,7 @@ class MainWindow(QtWidgets.QMainWindow):
 
                 if inner_param.opts.get("pid_autotune", None) is not None:
                     auto_tuner_param = inner_param.opts["pid_autotune"][0]
-                    if inner_param.opts["pid_autotune"][1] != "ch":
+                    if inner_param.opts["pid_autotune"][1] != "$ch":
                         ch = inner_param.opts["pid_autotune"][1]
                     self.autotuners.set_params(auto_tuner_param, ch, data)
 
@@ -293,7 +293,7 @@ class MainWindow(QtWidgets.QMainWindow):
                         inner_param.reverse[0].index(data)  # ListParameter.reverse = list of codename values
                     ]
                     if activater is not None:
-                        if activater[1] == "ch":
+                        if activater[1] == "$ch":
                             activater[1] = ch
                         await self.client.set_param(*activater)