Yoshitake STC-1 is a simple checker that diagnoses the condition of steam traps. It is equipped with automatic steam trap diagnosis, operation auscultation, and steam piping surface temperature sensor functions, enabling speedy and accurate evaluation in various environments.

Features

• Easy to handle: Realizes diagnosis with simple 2-step operation. Consecutive diagnosis is possible under the same conditions.
• Short diagnosis time: Takes only 2 or 8 seconds for automatic diagnosis.
• Vibration function: Start and completion of diagnosis is notified by a vibrator, reducing misdiagnosis and enabling use in blind situations like dark or narrow places.
• LED function: Diagnosis result can be confirmed on a large LCD screen and LED display. LED turns on when diagnosis completes.
• Switchable functions: Surface temperature sensor function and auscultation function can be used arbitrarily. Leakage and clogging of other steam valves besides the steam trap can also be detected.

Specifications

Specification	Value
Model	STC-1
Steam trap automatic diagnosis time	2 seconds or 8 seconds
Working pressure for automatic diagnosis	0.05 - 8.0 MPa
Working temperature for surface sensing	0 - 300 °C
Ambient temperature	0 - 40 °C (Non-Freezing)
Automatic power off	After 5 minutes (while in diagnosis mode and not in operation)
Where to use	Inside and outside (should not be exposed to rain water)
Battery	DC1.5V AAA alkaline batteries 2pcs
Continuous operating time	Approximately 8 hours
Weight	214g (including batteries) / 235g (without batteries in some regions)
Accessories	Storage case, sensor cap, earphones

Dimensions and Weight

Mode (Function)

Mode (Function)	Overview
Steam trap automatic diagnosis mode	Automatically diagnoses the conditions of steam traps.
Surface temperature sensor mode	Indicates the surface temperature of steam piping.
Auscultation mode	Listens to the conditions of the steam trap.

Results of Automatic Diagnosis

Result	Working conditions of steam trap	LED color
GOOD	Good condition	Green
CAUTION	Hard to judge whether GOOD or LEAK. Caution required for the possibility of LEAK.	Yellow
LEAK	High possibility of steam leakage	Red
LOW TEMP.	High possibility of clogged, not in service, or inadequately low capacity, because the surface temperature is low.	Yellow

Name of the Parts

Manual operation button	Operation description
POWER/MODE button	Power ON/OFF: Press down the button for 2 seconds or more. Switch the mode: Steam trap automatic diagnosis → Surface temperature sensor → Auscultation
TRAP Button	Select a steam trap type: DISC → BUCKET → FLOAT → THERMO → OTHERS
▲·▼ Button	Select a pressure range. Adjust Volume. Back light ON/OFF.
START Button	Start steam trap automatic diagnosis.

WARNING

STC-1 cannot be used to check steam traps for tracing lines.

Structural Breakdown

No.	Name of Parts	Materials	Q.TY
1	Body	Synthetic Resin etc	1
2	Sensor Cap	Synthetic Resin	1
3	Battery Cover	Synthetic Resin	1
4	Battery Cover Gasket	Silicone Rubber	1
5	Rubber Cap	Silicone Rubber	1
6	Product Label	-	1
7	Serial Number Label	-	1
8	Earphone	-	1
9	Alkaline Battery	-	2
10	Carry Case	-	1

Procedures for Steam Trap Automatic Diagnosis Mode

1. Choose "Steam trap automatic diagnosis mode" by pressing the "POWER/MODE" button.
2. Select the type of steam trap by pressing the "TRAP" button.
3. Select the pressure range by pressing the "▲ · ▼" button.

Table 1: Pressure range

No	Pressure Range
1	0.05 MPa or more and less than 0.1 MPa
2	0.1 MPa or more and less than 0.5 MPa
3	0.5 MPa or more and less than 1.0 MPa
4	1.0 MPa or more and less than 2.0 MPa
5	2.0 MPa or more and less than 3.0 MPa
6	3.0 MPa or more and less than 4.0 MPa
7	4.0 MPa or more and less than 5.0 MPa
8	5.0 MPa or more and less than 6.0 MPa
9	6.0 MPa or more and less than 7.0 MPa
10	7.0 MPa or more and less than 8.0 MPa

4. Press the sensor tip vertically against the inlet side (flat surface) of the steam trap.

TIP

During the steam trap diagnosis, press the sensor tip as vertically as possible. If the sensor tip is pressed from an angle, the contact condition will change and accurate measurement will not be possible. It is recommended to create a flat surface by sanding the measurement surface.

5. Press the "START" button to start the steam trap diagnosis. Vibration will notify you of the starting of the measurement.
6. The diagnosis completes with vibrator operation (after 2 seconds or 8 seconds).
7. The screen displays the diagnosis result, and the LED turns on for about 5 seconds.