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4" Temperature Chart Recorder Manual

Product Applications

This manual applies to : DRG350 ; SK4100 & SL4100/490

These units are self-contained temperature recorders. The SK4 & SL4 recorders are portable, easy-to-use and provide a permanent record of temperatures. These recorders have locking door and built-in slot for an 
optional tie-down cable and lock.

The SK4 was designed for use in applications where recording long term temperature trends is most important. The SL4 was built to give you the best of both worlds: a permanent record of long term temperature recording combined with an easy-to-read, digital display.

Useful Features

  • Battery Powered, operates on a single AA battery for up to 3 years
  • 2.5 more readable than a 3 inch chart recorder
  • Totally self-contained and easy-to-use (place directly in the environment to be monitored)
  • Battery access
  • Portable and compact
  • SL4 features easy to read LCD display

Product Specifications

Sk4 1 635

Getting Started

  • Set the switch on the back of the unit to the appropriate motor speed: 7 day or 24 hour.
  • Place a new chart on the recorder.
  • Set the time by inserting a coin into the chart hub and turning clockwise until the current hour is referenced by the time indicator. (Time Indicator is directly to the right and below the pen tip.)
  • Remove protective pen cap.

Pen Replacement

Slide the used pen cartridge off and slide the new one on. Typical pen life is one year.

Battery Replacement

  • The battery compartment is located on the back of the recorder. The recorder uses a standard “AAA” battery for up to two years of battery life.
  • Insert new battery with the positive end down


Sk4 2 643


Sk4 3 645

Calibration Services - New Units

  • N100 - NIST Traceable Calibration 1-Point: Includes documentation to one Dickson pre-selected point on new units only.

  • N300 - NIST Traceable Calibration 3-Point: Includes documentation of three Dickson pre-selected points (a high, medium, and low) on new units only.

The Importance and Benefits of Regular Calibrations

Once you begin to use your precision Dickson instrumentation, regular  calibrations are necessary to ensure accurate readings.

The following Calibration Services are available:

  • N150 - NIST Traceable Calibration 1-Point: Includes documentation to one Dickson pre-selected point after re-calibration.

  • N350 - NIST Traceable Calibration 3-Point: Includes documentation of three Dickson preselected points (a high, medium, and low) after re-calibration

Why should I recalibrate my instrumentation?

Over time dirt, dust and normal handling can throw your precision instrumentation out of calibration. Regular calibrations ensure that you receive the most accurate readings possible. 

How often should I recalibrate my instrumentation?

Depending on the environment your instrument is used in and how often it is handled you will want to recalibrate your instrument every 6 to 12 months. Instruments in environments where there are extreme temperatures, wide temperature ranges, humidity or pressure variations, high condensation, dirt, dust and other debris will require calibration at least every 6 months. Instruments that are frequently moved or in locations with heavy machinery that cause vibrations should also be calibrated at least every 6 months. 

Why should I return my instrument to Dickson for calibration?

Dickson calibrates your instrument at the factory using proprietary production/calibration software that guarantees proper calibration.

Our Capabilities

Dickson is the first manufacturer of humidity and temperature instrumentation to receive A2LA accreditation. We are also NIST Traceable; our procedures conform to MIS-STD-45662A, ANSI/NCSL 2540-1-1994, 
ISO/IEC Guide 25 and ISO10012. We are experts in the manufacture and calibration of humidity and temperature instruments.

Fast Service: Our turnaround time is 3 days or less so you receive not only expert service but fast service as well. 

Easy: We make it easy for you! No phone calls for Return Authorization Numbers are required. We remind you when your instrument is due for calibration. You simply send in the completed Calibration Order Form with your unit for calibration with freight prepaid to Dickson. 

User Calibration

Periodically check accuracy with a test gauge. If pen adjustment is required, use the adjusting screw located inside the door on the upper left corner of the dial plate. Check two points on the scale when adjusting the pen to make sure recorder calibration is maintained.

Note: When no signal (no pressure) is being applied to the recorder, the pen may not rest exactly on the zero chart line. It is possible for the allowable 2% of scale error to occur at zero, while upscale readings are increasingly more accurate.


For troubleshooting information, visit


Dickson warrants that the products it sells will be free from defects in material and workmanship under normal use and service for a period of twelve months after delivery. In the event of a claim under this warranty, the product or part must be returned to the factory for repair or replacement (shipping pre-paid) with a Return Authorization Number (see Return Information above). It will be repaired at Dickson’s option without charge. This warranty DOES NOT cover routine calibration, pen, chart and battery replacement. The foregoing warranty and remedy are exclusive and in lieu of all other warranties either expressed or implied. Dickson shall not be liable for consequential or incidental damages resulting from failure or malfunction of its products. Dickson makes no warranty for products not manufactured by it or for any products modified by buyer, or subject to misuse or neglect.

Factory Service & Returns

Contact the factory (630-543-3747) for a Return Authorization (RA) Number before returning any instrument. The model number, serial number and a purchase order number will be requested before an RA number is issued.

  • Carefully repack the instrument, label the outside of the box with the RA# and return the instrument (freight pre-paid) to Dickson.
  • All instruments that do not have the RA# clearly marked on the outside of the box will be refused. 
  • When returning instruments for credit, please include all accessories in shipment. Calibration/Freight charges are non-refundable.
NOTE: Dickson shall not be liable for consequential or incidental damages resulting from failure or malfunction of its products

Customer Satisfaction

Dickson takes pride in providing you, the customer, with the highest quality instrumentation. We welcome the opportunity to help you in any way possible. Whether it be a question or a new idea in documentation, 
the Dickson Company would like to hear your response. Please call our Customer Service Department at 1-800-323-2448 or (630) 543-3747 (in Illinois).

Software Return Policy

IMPORTANT-Read your Software License Agreement carefully before installing software. DIckson will accept returns for replacement of defective disks and CDs only