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Sekonic ST-50A User Manual

Sekonic ST-50A
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Microprocessor-Based
Hygro-Thermograph
ST-50A / ST-50M
Operation Manual
Thank you for purchasing this Microprocessor-Based Hygro-Thermograph.
The essential information for the correct oper ation of the Hygro-Thermograph is described
in this manual. Please be sure to read this manual carefully before using the Hygro-
Thermograph.
CE Approved

Table of Contents

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Sekonic ST-50A Specifications

General IconGeneral
BrandSekonic
ModelST-50A
CategoryMeasuring Instruments
LanguageEnglish

Summary

Safety Information

Pictorial Symbols

Explains warning symbols used in the manual for operator safety.

Examples of Pictorial Symbols

Illustrates common hazard symbols and their meanings for user understanding.

Check Before Use

Chapter 1. Machine Call-outs

Chapter 2. Installation

Chapter 3. Preparation for Measurement

Setting (Replacing) Chart Paper

Instructions for loading or changing the chart paper cassette.

Inserting (Replacing) Dry Batteries

Steps for installing or changing the instrument's batteries.

Setting (Replacing) Recording Pens

Guide for installing or replacing the temperature and humidity pens.

Connecting AC Adapter

Procedure for connecting the external power supply.

Connecting Extension Cable

Instructions for attaching an extension cable for remote sensor placement.

Inserting the SD Card (ST-50M Only)

Steps to insert an SD card for data logging.

Removing the SD Card (ST-50M Only)

Procedure for safely ejecting an SD card.

Chapter 4. Basic Operation

To Start and Stop Recording

How to initiate and terminate data recording.

To Change Chart Speed

Adjusting the speed at which the chart paper moves.

To Select Celsius or Fahrenheit

Setting the temperature display unit.

Power Saving Mode

Activating a mode to conserve battery power.

Chapter 5. SD Card Writing Function (ST-50M Only)

SD Card Writing Function

Overview of storing measurement data on an SD card.

Starting and Stopping Data Writing to SD Card

Procedures to begin and end SD card data saving.

Changing the SD Card Writing Interval

Setting the frequency for data logging to the SD card.

Changing the Date

Updating the instrument's internal date setting.

Changing the Time

Updating the instrument's internal time setting.

Initializing the SD Card

Formatting the SD card to erase all data.

Chapter 6. Setting Recording Range

Setting Temperature Recording Range

Configuring the temperature limits for chart recording.

Setting Humidity Recording Range

Configuring the humidity limits for chart recording.

Chapter 7. Setting Alarm

Function Overview

Explains the purpose of alarm indicators.

Setting Temperature Alarm

Configuring high and low temperature alarm thresholds.

Setting Humidity Alarm

Configuring high and low humidity alarm thresholds.

To Initialize the Alarm

Resetting all alarm settings to default.

Chapter 8. Display Indicators (ST-50M Only)

SD Card Recording Cycle Indicator

Displays the current setting for SD card data saving frequency.

Date Indicator

Shows the current date on the LCD.

Time Indicator

Shows the current time on the LCD.

Normal Measurement Screen

The main display showing current readings and status.

Temperature Recording Range Setting Indicator

Displays the active temperature recording range.

Humidity Recording Range Setting Indicator

Displays the active humidity recording range.

Chapter 9. Useful Function

Pen Trace Offset Compensation (POC)

Adjusting pen positions to align recording traces.

Marking Function

Adding manual marks on the chart paper.

Indicating Dew Point Temperature and Absolute Humidity

Displaying derived humidity metrics.

Chapter 10. Sensor Calibration

Sensor Calibration Status and Operation Menu

Checking calibration status and accessing calibration options.

Calibrating Temperature Sensor

Adjusting the temperature sensor for accuracy.

Calibrating Humidity Sensor

Adjusting the humidity sensor for accuracy.

2-Point Calibration of Humidity Sensor

Performing a two-point calibration for humidity sensor accuracy.

To Initialize the Calibrated Value

Resetting sensor calibration to factory defaults.

Chapter 11. Pen Position Adjustment

Function Overview

Explains the purpose of pen position adjustment.

To Check the Adjustment Status

Verifying the current pen position adjustment.

Adjusting Temperature Recording Pen Position

Fine-tuning the temperature pen's position on the chart.

Adjusting Humidity Recording Pen Position

Fine-tuning the humidity pen's position on the chart.

To Initialize the Adjusted Value

Resetting pen position adjustments to default.

Chapter 12. Maintenance

Periodic Inspection

Regular checks to ensure optimal instrument performance.

Replacement of Sensor (Assembly)

Procedure for replacing the sensor unit.

Replacing the Clock Backup Battery

Steps to replace the internal battery for the clock.

Chapter 13. Data Files (ST-50M Only)

File Names

Describes the naming convention for data files.

Data Content

Details the structure and fields of the saved data files.

Chapter 14. Troubleshooting

Troubleshooting Tips

General guidance for resolving operational issues.

List of Error Messages

Explains specific error codes and their solutions.

Chapter 15. Specifications

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