Digi-Sense 91428-05 Instruction Manual

Instruction Manual

Single-Input Thermistor

Thermometer

(Model 91428-05)

68X001349 Rev0 0717 1065DGMAN_91428-05

TABLE OF CONTENTS

1. QUICK-START GUIDE ........................... 1

2. INTRODUCTION .................................... 2

3. SAFETY PRECAUTIONS ....................... 3

4. SPECIFICATIONS ................................. 4

5. BATTERY INSTALLATION AND

REPLACEMENT .................................... 5

6. INSERTING AND REMOVING

OPTIONAL RUBBER ARMOR ............... 6

7. ASSEMBLING OPTIONAL HANDS-

FREE ACCESORIES ............................. 7

8. CONNECTING A THERMISTOR............ 8

9. KEY FUNCTIONS .................................. 9

10. DISPLAY OVERVIEW ........................... 10

11. MEASUREMENT MODE .......................11

12. SELECTING TEMPERATURE SCALE ..12

13. MIN AND MAX FUNCTION ...................12

14. AUTO OFF FUNCTION .........................13

15. CALIBRATION ......................................13

16. CLEAR FIELD CALIBRATION ...............14

17. FIELD CALIBRATION UNLOCK ............15

18. FIELD CALIBRATION LOCKOUT .........16

19. MAINTENANCE ....................................17

20. CLEANING ............................................17

21. BATTERIES ..........................................17

22. TROUBLESHOOTING ..........................18

23. ACCESSORIES ....................................19

24. WARRANTY .........................................20

25. PRODUCT RETURN .............................20

26. INNOCAL® CALIBRATION AND REPAIR

SERVICES (NORTH AMERICA) ..........21

- 1 -

1. QUICK-START GUIDE

To ensure best results please read the
complete manual.

1. Connect probe.

2. Press the on/off key.

Press again to turn on backlight.

3. Select °C or °F display using °C/°F key.

4. Insert probe in sample.

Allow adequate time for reading to
stabilize.
Response time will vary depending on
probe.

5. Take reading.

Press hold key to freeze display.
Press min/max to display minimum or
maximum temperature.

6. Press and hold the on/off key for three

seconds to turn meter off.

- 2 -

2. INTRODUCTION

Thank you for choosing the
Single-Input Thermistor
Thermometer. This sturdy
handheld thermometer
provides highly accurate
temperature measurements
using thermistor probes. The
instrument is easy to use and
includes the following
features:

• Operator selection of Celsius or Fahrenheit

scale

• Resolution of 0.1° C/F

• Large backlit LCD with two lines of

four-digit display

• Hold feature for temporarily retaining

a reading

• Min and max readings display

•

Field calibration capability

•

Auto power off with Enable/Disable function

• Low-battery warning

• Standard ¼ inch (6.3mm) phone jack

connector input

• Operates with a wide selection of probes

- 3 -

3. SAFETY PRECAUTIONS

Voltages present at the thermistors may
also be present at the battery terminals.
Always disconnect the thermistor when
changing batteries.

This instrument is designed to accept low
level signals supplied by standard 400
series thermistors. Under no
circumstances should the input voltage
exceed the specified 10 v rms.

1. Do not use or store this instrument in

microwave ovens or any abnormally hot or
cold areas.

2. Weak batteries should not be left in the

instrument. Dead batteries can leak and
cause damage to unit.

WWARNING

- 4 -

4. SPECIFICATIONS

Range

–40 to 150°C
(–40.0 to 302.0°F)

Resolution

0.1°C (0.1°F)

Accuracy

±0.2°C (±0.4°F) from
–40 to 125°C (-40 to 257°F)

±0.5°C (±0.9°F) from
125 to 150°C (257 to 302°F)

LCD display

4+4 digit, 58 x 40mm dual-line
display with backlight

Out-of-range
display

“Ur” or “OPEN”

Display update rate

0.5 sec per update

Input

One probe with ¼ inch (6.3mm)
phone jack connector

Input protection

10 v rms

Battery

Three AA, 1.5V alkaline

Battery life

700 hours continuous, typical

Auto shutoff

17 minutes after last key press

Stability criteria

“STABLE” will display upon
5 seconds of stability

Stated accuracy

18 to 28°C (64 to 82°F)

Useful range

0 to 40°C (32 to 104°F)

Storage

–40 to 65°C (–40 to 149°F)

Humidity

10% to 90% RH (noncondensing)

Dimensions
(L x W x H)

Without armor:

175mm x 97mm x 42mm

With armor:

180mm x 102mm x 52mm

Weight with
batteries

Without armor: 267g
With armor: 362g

Ingress protection

Meets IEC-529 IP-54 for dust and
water-resistant enclosures

Compliance
(for CE mark)

EN61326-1/A1: 1998
(EU EMC Directive)

- 5 -

5. BATTERY INSTALLATION AND

REPLACEMENT

Voltages present at the thermistors may
also be present at the battery terminals.
Always disconnect the thermistor when
changing batteries.

Weak batteries should not be left in the
instrument. Dead batteries can leak and
cause damage to unit.

The typical battery life is about 700 hours.
Selected settings

are

stored in

memory and

will remain in memory

even after

power is

turned

off, or

while

batteries

are being

replac

ed.

1. Before

changing

battery, tur

n instrume

nt

off

and disconnect probe

.

2.

Loosen screw and

lift battery

cover

off

the

back

of case.

3.

Remove

the t

hree

AA batteries.

4. Insert three

new

batteries

observing

pol

arity.

5.

Install

cover and

tighten

screw

.

- 6 -

6. INSERTING AND REMOVING

OPTIONAL RUBBER ARMOR

1. To insert thermometer into the optional

rubber armor, slide in from the top of
meter before pushing the bottom edges
of meter down to set it into position. Lift
up the stand at the back of meter for
benchtop applications if necessary.

2. To remove thermometer from armor,

push out from the bottom edges of
meter until it is completely out of boot.