Extech SD750 Operating Manual

User Manual

3-Channel Pressure Datalogger

Model SD750

Additional User Manual Translations available at www.extech.com

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Introduction

Congratulations on your purchase of the Extech SD750 Pressure Datalogger for use with 2-wire
pressure transducers (optionally available). This meter displays and stores pressure measurement
data over time and stores the information on a SD card which can be downloaded to a PC. This
meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable
service. Please visit our website (www.extech.com) to check for the latest version of this User
Guide, Product Updates, and Customer Support.

Features

 Monitor Pressure Levels from three separate sources
 Datalogger date/time stamps and stores readings on an SD card in Excel® format for easy

transfer to a PC

 RS232 serial 16-bit output stream
 Selectable data sampling rate: 5, 10, 30, 60, 120, 300, 600 seconds and AUTO
 Low power consumption, long battery life
 AC power adaptor (included)
 For use with 2-wire pressure transducers (optionally available)

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Meter Description

1. LCD Display

2. Channel 1 Pressure Reading

3. Channel 2 Pressure Reading

4. Channel 3 Pressure Reading Display

5. Unit of measure for all channels

6. Protective compartment door (side)

7. LOG (ENTER) button

8. SET button

9.

▼

down arrow button

10.

▲

(TIME) up arrow button

11. Channel 1 transducer input (4-20mA)

12. Channel 2 transducer input (4-20mA)

13. Channel 3 transducer input (4-20mA)

Left side view (behind protective door)

14. AC power adaptor jack for supplied adaptor

15. Reset button (press if display locks)

16. RS-232 16-bit data stream output

17. SD memory card socket

Note:

The battery compartment, tilt stand, and wall mount access holes, not pictured, are

located on the rear of the meter.

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Getting Started

Meter Power Notes:

o The internal batteries (6 x 1.5V AAA) maintain the clock time/date accuracy.
o The AC adaptor powers the unit for all other operation.
o Time and Date is kept accurate even when the AC adaptor is disconnected as long as

fresh batteries are installed.

o For normal operation, please install batteries AND connect the unit to an AC source via

the AC adaptor.

o The unit does not have a power switch.

Battery Warning, Installation and Replacement

1. When the low battery icon appears in the display, the batteries are weak and should

be replaced as soon as possible.

2. To replace or install batteries, remove the Philips head screw that secures the rear

battery cover and lift off the cover.

3. Replace the six (6) ‘AAA’ batteries (use alkaline, heavy duty type), observing polarity.

4. Replace and secure the cover.

Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate
collection sites, the retail store where the batteries were purchased, or wherever
batteries are sold.

Disposal: Do not dispose of this instrument in household waste. The user is
obligated to take end-of-life devices to a designated collection point for the disposal
of electrical and electronic equipment.

Other Battery Safety Reminders

o Never dispose of batteries in a fire. Batteries may explode or leak.
o Never mix battery types. Always install new batteries of the same type.