diff --git a/succbone/succd/process.go b/succbone/succd/process.go
index b285fab..a62c261 100644
--- a/succbone/succd/process.go
+++ b/succbone/succd/process.go
@@ -28,71 +28,6 @@ type daemon struct {
 	daemonState
 }
 
-// momentaryOutput is an output that can be triggered for 500ms.
-type momentaryOutput struct {
-	// output of the block.
-	output bool
-	// scheduledOff is when the block should be outputting false again.
-	scheduledOff time.Time
-}
-
-func (m *momentaryOutput) process() {
-	m.output = m.scheduledOff.After(time.Now())
-}
-
-func (m *momentaryOutput) trigger() {
-	m.scheduledOff = time.Now().Add(time.Millisecond * 500)
-}
-
-// thresholdOutput outputs true if a given value is above a setpoint/threshold.
-// It contains debounce logic for processing noisy analog signals.
-type thresholdOutput struct {
-	// output of the block.
-	output bool
-	// debounce is when the debouncer should be inactive again.
-	debounce time.Time
-	// threshold is the setpoint of the block.
-	threshold float64
-}
-
-func (t *thresholdOutput) process(value float64) {
-	if time.Now().Before(t.debounce) {
-		return
-	}
-	new := value > t.threshold
-	if new != t.output {
-		t.output = new
-		t.debounce = time.Now().Add(time.Second * 5)
-	}
-}
-
-// ringbufferInput accumulates analog data up to limit samples, and calculates
-// an average.
-type ringbufferInput struct {
-	data  []float32
-	limit uint
-	avg   float32
-}
-
-func (r *ringbufferInput) process(input float32) {
-	// TODO(q3k): use actual ringbuffer
-	// TODO(q3k): optimize average calculation
-	// TODO(q3k): precalculate value in mbar
-	r.data = append(r.data, input)
-	trim := len(r.data) - int(r.limit)
-	if trim > 0 {
-		r.data = r.data[trim:]
-	}
-	avg := float32(0.0)
-	for _, v := range r.data {
-		avg += v
-	}
-	if len(r.data) != 0 {
-		avg /= float32(len(r.data))
-	}
-	r.avg = avg
-}
-
 // process runs the pain acquisition and control loop of succd.
 func (d *daemon) process(ctx context.Context) {
 	ticker := time.NewTicker(time.Millisecond * 100)
diff --git a/succbone/succd/process_blocks.go b/succbone/succd/process_blocks.go
new file mode 100644
index 0000000..39d7886
--- /dev/null
+++ b/succbone/succd/process_blocks.go
@@ -0,0 +1,75 @@
+package main
+
+import "time"
+
+// momentaryOutput is an output that can be triggered for 500ms.
+type momentaryOutput struct {
+	// output of the block.
+	output bool
+	// scheduledOff is when the block should be outputting false again.
+	scheduledOff time.Time
+}
+
+func (m *momentaryOutput) process() {
+	m.output = m.scheduledOff.After(time.Now())
+}
+
+func (m *momentaryOutput) trigger() {
+	m.scheduledOff = time.Now().Add(time.Millisecond * 500)
+}
+
+// thresholdOutput outputs true if a given value is above a setpoint/threshold.
+// It contains debounce logic for processing noisy analog signals.
+type thresholdOutput struct {
+	// output of the block.
+	output bool
+	// debounce is when the debouncer should be inactive again.
+	debounce time.Time
+	// threshold is the setpoint of the block.
+	threshold float64
+}
+
+func (t *thresholdOutput) process(value float64) {
+	if time.Now().Before(t.debounce) {
+		return
+	}
+	new := value > t.threshold
+	if new != t.output {
+		t.output = new
+		t.debounce = time.Now().Add(time.Second * 5)
+	}
+}
+
+// ringbufferInput accumulates analog data up to limit samples, and calculates
+// an average.
+type ringbufferInput struct {
+	data  []float32
+	limit uint
+	// avg is the mean average of the samples in data, or 0.0 if no data is
+	// present yet. This is the main output of the block.
+	avg float32
+}
+
+func (r *ringbufferInput) process(input float32) {
+	// TODO(q3k): use actual ringbuffer
+	// TODO(q3k): optimize average calculation
+	// TODO(q3k): precalculate value in mbar
+	r.data = append(r.data, input)
+	trim := len(r.data) - int(r.limit)
+	if trim > 0 {
+		r.data = r.data[trim:]
+	}
+	avg := float32(0.0)
+	for _, v := range r.data {
+		avg += v
+	}
+	if len(r.data) != 0 {
+		avg /= float32(len(r.data))
+	}
+	r.avg = avg
+}
+
+// saturated returns true if the number of samples is at the configured limit.
+func (r *ringbufferInput) saturated() bool {
+	return len(r.data) >= int(r.limit)
+}
diff --git a/succbone/succd/process_state.go b/succbone/succd/process_state.go
index 8ed1c41..c7ab5eb 100644
--- a/succbone/succd/process_state.go
+++ b/succbone/succd/process_state.go
@@ -50,7 +50,7 @@ func piraniVoltsToMbar(v float32) float32 {
 
 // piraniDetection guesses whether the pirani gauge is connected.
 func (d *daemonState) piraniDetection() piraniDetection {
-	if len(d.piraniVolts3.data) < int(d.piraniVolts3.limit) {
+	if !d.piraniVolts3.saturated() {
 		return piraniDetectionUnknown
 	}
 	mbar := piraniVoltsToMbar(d.piraniVolts3.avg)