Wahl Digi-Stem DST600 Series User manual

DST600 Series
Digi-Stem®Thermometers
User Manual
Wahl Instruments, Inc.
234 Old Weaverville Road
Asheville, NC 28804
Toll Free 800-421-2853
Phone [phone]
Fax [phone]
www.palmerwahl.com
04/12/12
WD1032 Rev L (05/24/16)
For use with models:
DST600
DST610, DST611, DST620 & DST621
DST640
DST650, DST651, DST660, DST661
Including “I”, “R” and “P” versions

DST600 Series USER MANUAL
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Index
1.!Applications, Key Features, and Models __________________________________ 2!
2.!CE Approval ________________________________________________________ 4!
3.!Installation _________________________________________________________ 4!
4.!Battery Installation / Replacement / Battery Life ____________________________ 7!
5.!Operation __________________________________________________________ 8!
6.!Calibration ________________________________________________________ 10!
7.!Specifications – DST600 / DST640 Series ________________________________ 12!
8.!DST610/650, DST611/651, DST620/660, and DST621/661___________________ 13!
9.!Specifications – DST650, DST651, DST660, DST661 _______________________ 17!
10.!Service ___________________________________________________________ 18!
11.!Panel Mount Instructions_____________________________________________ 18!
12.!13516 Panel Mount Drawing__________________________________________ 19!
13.!See Addendum – WD1053 Battery Install & Shipping Instructions ____________ 20!
1. Applications, Key Features, and Models
The Wahl DST6xx series is designed for temperature monitoring applications,
specifically in the food, dairy and pharmaceutical markets, however it is well
suited for any application requiring a high degree of accuracy and reliability.
To achieve this objective the DST6xx Series incorporates the following features:
•High reliability, 4-wire, 100 ohm, .00385Ω/Ω/°C, thin-film platinum RTD
sensor per DIN EN 60751, Class A.
•High accuracy 24-bit Delta-Sigma Analog/Digital Converter.
WARRANTY & CALIBRATION
REGISTRATION at
www.palmerwahl.com/register
Registration is fast and easy. In about a minute you
can have your product automatically registered for
Warranty Protection and our Calibration Reminder
service. Let Palmer Wahl help you protect your
investment, and maintain product accuracy and
compliance with ISO and other quality standards.
Questions? Call Customer Service
at 1-800-421-2853 or 828-658-3131
Or email: [e-mail]

DST600 Series USER MANUAL
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•Self-checking Electronic Circuitry: Meter repetitively checks the electronics
accuracy by measurement of on-board ultra-stable, low ppm precision
resistors against embedded firmware values and displays “err” in the event
the electronics is out by more than ±0.5°F (0.3°C). The self-checking
electronic circuit may be tested by rapidly changing the temperature of the
sensor, such as placing from room temperature into ice bath or heated
process. Unit will display “err” occasionally when going through rapid
changes and will return to normal as temperature begins to stabilize (usually
within 10°of final temperature). This serves as a test and indicator that the
self-checking circuitry is functioning properly.
•Probe Error checking: Checks for open wire, open sensor, shorted sensor,
incorrect wiring.
•Probe ID feature: Alerts the operator that the probe has been changed and
the calibration may be void. Requires the use of calibration software to
calibrate and associate the new probe with the meter. Available on fixed
stem and remotes less than 25 meters.
•Programmable R0: Allows programming of the sensing probes specific R0
value into the meter for accurate temperature calibration.
•Optional versions include “I” version for International shipping using a AA
battery, “R” version with adjustable resolution and “P” version for panel mount
option.
Models:
DST600 – Temperature Indicating Device – Nema 4X rated Stainless Steel
enclosure
DST610/611 – Temperature Indicating Device with independent secondary
RTD sensor and terminal block connection
DST620/621 – Temperature Indicating Device with independent secondary
RTD sensor and 4-20mA transmitter
DST640 – Harsh environment Temperature Indicating Device – All Stainless
Steel enclosure and increased RFI protection.
DST650/651 – Harsh environment Temperature Indicating Device - with
independent secondary RTD sensor with terminal block connection
DST660/661 – Harsh environment Temperature Indicating Device - with
independent secondary RTD sensor with 4-20mA transmitter
DST600
DST640
All Stainless Steel
Housing with Stainless
Steel H Frame
Stainless Steel
Housing with
Polycarbonate H
Frame

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2. CE Approval
The DST600 Model only carries CE approval per EN61326: 2006 for Radiated
Electromagnetic Field Immunity, Electrostatic Discharge Immunity and Radiated
Emissions Disturbances. See sections 3.4 and 3.5 for detailed installation
instructions.
3. Installation
Caution! See important information regarding Lithium Metal Batteries in
Wahl document #WD1053, before proceeding!
Your unit was shipped partially assembled. Installation of the battery by the end-
user is necessary as transportation regulations prohibit shipping units with the
battery installed. Units with long probes or remote cables may be shipped
unassembled. After installation of the battery, verify the display is operational
and remove the protective film from the window. In the event the display is not
operational, check that the battery is installed properly by following the battery
installation procedure, section 4.
3.1. Meter Mounting – Fixed Probe
Fixed probes may be mounted by the threaded fitting or sanitary clamp into
the process. Apply thread sealing compound or Teflon tape to the threaded
fitting as required. Units with swivel nut fittings or adjustable angle stems
may be adjusted after installation for best viewing angle.
Caution! Do not rotate Digi-Stems with adjustable angles more than 360°in
one direction as wire breakage may occur. See 3.7 for adjustment procedure.
Caution! Do not use the Digi-Stem enclosure to tighten meter. Use a wrench
on the coupling nut for tightening.
3.2. Meter Mounting – Remote Probe
An optional mounting bracket is available for mounting remote meters to
walls, panels, pipes, etc. The mounting bracket may be attached by the top
or rear surface with user provided mounting screws, U-bolts, clamps, etc.
The mounting bracket is available in 2 styles, p/n DSA3030, without ground
lug and DSA3031, which includes a grounding lug for grounding of the meter
when the probe will not be grounded.
3.2.1. For remote mounting: Mount the bracket with the Digi-Stem
mounting screw towards the bottom (Fig. 1). The Digi-Stem’s
coupling nut should be inserted from the top, with the display facing
out and secured with the Digi-Stem mounting screw. Loosen or
remove the Digi-Stem mounting screw.
3.2.2. For remote cables, thread the cable through the slotted sections of
the mounting bracket holes, so the cable moves freely. Insert the
meter’s coupling nut through the top hole of the mounting bracket and
secure with the large slotted Digi-Stem mounting screw.

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3.3. Meter Mounting – Panel mount version (designated by “P” suffix)
3.3.1. Panel mount versions are equipped with the probe and secondary
sensor connections mounted on the rear of the enclosure. They are
also equipped with two threaded studs on the rear with a U-bracket,
wing nuts and washers. An additional gasket is placed on the rear
facing surface of the H-frame to seal the panel opening.
3.3.2. For detailed installation instructions see Wahl document WD1100
and reference Wahl drawing 13615, both included in section 11 of
this manual.
3.4. Wire Connections – In the event that your probe was shipped
disconnected from the meter, the following describes the probe wiring and
installation process.
3.4.1. Loosen the four Phillips head screws in the front cover until the
cover is removed. Note: The screws are held captive by retaining
washers and should not be removed completely.
3.4.2. Remove the 6 pin pluggable terminal strip connector (J1) from the
PCB mating connector and connect probe wires per the following
table and as shown in Fig. 4.
Probe Connection Wiring
Wire Color
P1 Pin
Signal Name
Fixed Probe
Remote Probe
1
Excite +
White
Brown
2
RTD +
White
White
3
RTD -
Black
Blue
4
Excite -
Black
Black
5
Probe ID Ground
Brown
Gray
6
Probe ID Signal
Orange
Pink
3.4.3. Connect the pluggable terminal strip to PCB connector J1.
Fig. 1
Digi-Stem
Mounting Screw
Bracket Mounting
Holes

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3.4.4. Install the battery with polarity as indicated on battery holder.
3.4.5. Replace cover on Digi-Stem enclosure and secure with four screws
tightened to a force of 4 to 5 in-lbs. of torque.
3.5. Ferrite Installation
The Wahl DST600 CE compliance requires installation of 2 clamp-on
ferrites around the internal wiring. For other DST6xx series, 2 clamp-on
ferrites are included to minimize RFI susceptibility. These ferrites should
be placed around the internal wiring. These are normally installed when
the system is delivered, however on units with extremely long probes or
when meters are shipped without a probe, these may need to be installed
by the end-user.
There is 1 large ferrite and 1 small ferrite that are required to comply with
the CE directive on model DST600, and are recommended to be installed
for EMI immunity. See Fig. 2 for reference. The wires coming from the
probe should be passed through the large ferrite, looped around once and
passed through again. Also, route the green/yellow PCB ground lead
through the ferrite once, with the connector toward the probe end of the
ferrite. The large ferrite can then be snapped closed, making sure that the
wires are not pinched. The small ferrite is then installed on the remaining
length of all wires, toward the connector with it passing through the ferrite
only once. The wire does not have to loop through the small ferrite. The
small ferrite can then be snapped closed, making sure that the wires are
not pinched. Cable ties can then be installed as shown (see Fig. 3) to
secure the ferrites in place.
Ground Wire Not
Looped
Probe Wire Loop 1 Time
Connector P1
Small Ferrite
Large Ferrite
Note:
Ferrites Shown
Open
Fig. 2
Fig. 3

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3.6. Grounding
3.6.1. The DST600 should be grounded for CE compliance and optimum
noise immunity.
3.6.2. The DST640/65x/66x should be grounded for optimum noise
immunity.
3.6.3. Grounding on DST6xx’s with rigid probes is accomplished by
grounding the probe shank. Typically, the equipment that the probe
shank is installed in will be grounded, which will also ground the
DST6xx meter assembly.
3.6.4. Grounding on most DST6xx’s with remote probes is accomplished
in the same manner as the rigid probes. If the remote probe or the
meter bracket are not grounded, optional meter mounting bracket,
DSA3031, should be used. This mounting bracket includes a ground
lug that allows the connection of a ground wire for grounding the unit
for CE compliance (DST600 only) and for optimum noise immunity.
3.6.5. Be certain the PCB ground wire is connected to the housing’s
ground lug, after servicing.
3.7. Ventilation
3.7.1. The DST6xx should be installed in an area of adequate air
exchange so that the specified ambient conditions are not exceeded.
3.8. Adjustable Angle Probe – Adjustment
3.8.1. For rotational adjustment, loosen the two long Phillips head screws
on the ends of the bracket and rotate the bracket around the coupling
nuts. Tighten screws when position is set to the desired location.
Caution! Do not rotate Digi-Stems with adjustable angles more than
360°in one direction as wire breakage may occur.
3.8.2. Angular adjustment, loosen the two short Phillips head screws in
the center slots and pivot the bracket to desired angle. Tighten
screws.
4. Battery Installation / Replacement / Battery Life
The DST6xx Series use a single 3.6V C-cell Lithium Thionyl Chloride battery,
Wahl Catalog # DSA3062. The DST6xxI uses a single 3.6V AA-cell Lithium
Thionyl Chloride battery, Wahl part number 12234-03. Low battery is indicated
by “LOW BATT” displaying in the lower right corner of the display. This indicates
approximately 2-6 weeks of battery life left. Actual time will vary dependent on
Display Update Rate Setting. See section 4.2 for additional information on
update rate and battery life.
4.1. Procedure
4.1.1. For installation or replacement, loosen the four Phillips-head
screws in the front cover until the cover is removed. Note: The
screws are held captive by retaining washers and should not be
removed completely.

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4.1.2. Remove old battery and dispose of in accordance with local, state
and federal regulations.
4.1.3. Insert new battery with polarity as indicated on battery holder.
Positive terminal should be at the top of the PCB.
4.1.4. Replace cover on Digi-Stem enclosure and secure with four screws
tightened to a force of 4 to 5 in-lbs. of torque.
4.2. Battery Life – Battery life is a function of the display update rate and may
be changed to fit the user’s needs. See section 5.3 for details on display
update rate. The following table shows approximate battery life for a
given display update rate.
Display update
rate in seconds
DST6xx w/ DSA3060 battery
approximate life in months
DST6xxI w/ 12234-03 battery
approximate life in months
1
15.7
5.2
2
32.2
10.7
4
60.7
20.2
5
73.8
24.6
10
129.3
43.1
5. Operation
5.1. Scale Selection °F/°C - Temperature scale is user selectable via jumper
J8 (Fig. 5) on the Printed Circuit Board (PCB). The scale is indicated in
the upper right corner of the display (Fig. 4).
5.2. Resolution Selection – DST6xxR offers the user the capability of
changing the displayed resolution by selecting either 0.1° or 1° resolution.
Resolution is selectable via jumper J7 (fig. 5) on the PCB, located to the
left of the F/C selection jumper. Selecting 1° will display the truncated
value, so a temperature of 255.9°F would display as 255°F.
NOTE: If using this feature, it is advised to set the meter to 0.1° resolution
for doing calibration measurements, as using 1° can add up to 0.9° of
error to the displayed reading.
5.3. Making measurements and display update rate - With the batteries
installed and probe connected the meter automatically updates the
display with the most recent measurement. Factory default for display
update rate is once every 2 seconds. Display update rate is settable from
.25 seconds to 10 seconds in .25 second increments, using optional
DSTCAL software.
Fig. 4

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5.4. Error Codes - During normal operation, the DST6xx continually performs
diagnostic testing on the sensor lines. Errors are indicated by the
following error codes:
Error Code
Description
HI
Reading is above meters usable range
LO
Reading is below meters usable range or sensor is shorted
CbL1
Indicates cable 1 is open (J1 pin 1)
CbL2
Indicates cable 2 is open (J1 pin 2)
CbL3
Indicates cable 3 is open (J1 pin 3)
CbL4
Indicates cable 4 is open (J1 pin 4), or open sensor
CbL5
Indicates a short between pins 2 & 3
err
Indicates accuracy error detected. Will also display during rapid
changes of temperature to the RTD sensor.
Prb
Indicates probe ID does not match probe ID programmed in meter
- - -
Indicates Low Battery Shutdown Mode
Pin 1
°F/°C Jumper
J8
Calibration
Port
Battery Positive
Terminal
PCB
Ground Wire
Probe ID
Signal
Probe ID
Ground
Exc-
Exc+
RTD -
.
RTD +.
J1
1°/0.1°Jumper
J7 DST600R
Only
Fig. 5 (DST600R Shown)

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6. Calibration
As with all electronic RTD thermometers, there are two main components to the
system. The first component is the electronics, which measures the resistance of
the sensing element and then converts this resistance value to a temperature
indication. The second component is the probe, also referred to as the sensor.
The probes sensor resistance changes as its temperature changes. This change
is in conformance to the DIN EN 60751 Class A standard. As in all manufactured
goods, there are slight variations in the finished parts. A key variable of an RTD
sensor is its resistance at 0°C, referred to as “R0” value. Once this value is
measured, it may be programmed into the meter to correct the temperature
conversion algorithm. Programming and/or calibration require the use of the
DSTCAL software package. This package includes the USB cable, USB/DST
Interface Box and DST calibration cable. DSTCAL programming software
includes the ability to set the Sample Rate, R0, associate a new probe with the
meter, calibration of the meter and/or calibration of the system (probe with
meter). The DST6xx uses the following techniques for calibration. For details of
the calibration, see the DSTCAL user manual, Wahl document # WD1037.
6.1. Ohm Meter calibration – Ohm Meter calibration is a 2-point calibration,
which calibrates the DST6xx’s electronics. It requires a NIST traceable
precision resistance source with a known accuracy of ±0.03 ohms at 90
and 194.1 ohms. Resistors used should have a temperature coefficient
of <5.0-ppm.
6.2. Probe (system) calibration - Probe calibration is a single point calibration
that is performed by placing the probe into an ice bath and following the
on screen prompts of the DSTCAL software. The DST6xx and software
will measure the probes R0 value and program it into the DST6xx’s
memory. The system is then calibrated. After system calibration is
completed, the calibration should be checked at the temperatures of
interest to the end user, using calibrated measuring equipment and
calibration baths. If traceability to a National Standard, such as NIST is
required, this check should be performed using traceable instruments,
performed and documented in compliance to documented procedures.
6.3. Adjusting for Negative Error Only – Low Acid Canned Food
While 21CFR Part 113.40 requirements for accuracy of a Temperature
Indicating Device (TID) are specified to be “accurate to 1° F (0.5°. C)”,
some manufacturer’s Quality Control System requires either “no positive
error” or a lesser amount of positive error, for example, +0.2°F maximum
error. It is possible on the Wahl DST6xx series thermometer to offset the
error to achieve this accuracy. It should be noted that in doing this, there
may be a slightly larger negative error at some temperatures; however it
typically should be within the mandated accuracy of 1°F.

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To achieve this we will be using the programmable RO value in the
DST6xx Series TID, which is accessed using the DSTCAL program. The
R0 value (R0 stands for resistance at 0°C), is a variable in the equation
for converting resistance to temperature for platinum RTD’s and is factory
set to match the specific value of the probe connected to the DST6xx.
Without going into great detail of the equation and its variables, the R0
variable essentially serves as an offset control, shifting the response
curve up or down the scale. Since the slope of the curve is controlled by
other variables that are not programmable, different meters may have
slightly different response to the same change in R0.
The process for performing this type of adjustment is as follows:
1) Measure the system error by putting the meter and probe into a stable
liquid bath monitored by an appropriate standard instrument (Reference
Device) and record. This should be measured at a temperature
representative of your process temperatures.
2) Determine the error and note if it is positive (TID > Ref. Dev.) or
negative (TID < Ref Dev.).
3) If error is negative, no action is needed.
4) If error is positive, R0 will need to be increased to lower the
temperature displayed. A good starting point is:
A + .03 ohm adjustment to R0, will drop the reading by about 0.2 to 0.3°F
A + .06 ohm adjustment to R0, will drop the reading by about 0.4 to 0.5°F
5) After adjustment, repeat step 1. If the results meet your requirements,
record this data on your calibration form and this will be your new
calibration record. Be certain to record your results and mark your
equipment in accordance with 21CFR part 113.100.
6) If the results still do not meet your requirements, then increase R0
slightly and repeat step 5.

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5
Wahl®
DST600
PW1201
01/09 Rev K
Revised 07/15
Continued Innovation Since 1836
ISO9001:2008 CERTIFIED
Meter Specifications and
Accessories
DST600 / DST640 S ERIES RTD M ETER S PECIFICATIONS
Standard Series
DST600 DST600R DST600I
All Stainless Steel, Upgraded
Board, RFI Protection Series
DST640 DST640R DST640I
Model Standard Selectable Resolution AA Battery for International shipments
Meter Range / Scale -50° to 500°F (-45.5° to 260°C) / User Selectable for °F or °C
Meter Accuracy ± 0.1°F/C, over 1-year period (@ Tamb = 23°C ± 5°C)
Meter and Probe Accuracy Temp ≤300°F (148.8°C) = ± 0.3°F (± 0.2°C), Temp > 300°F (148.8°C) = ± 0.25% of reading
Display 1.0" 4-digit LCD display with icons for °F, °C and Low Battery, Readable up to 30 ft.
Display Resolution 0.1°F/C User Selectable 1/0.1°F/C 0.1°F/C
Sample/Display Rate 2 seconds standard, adjustable in .25
second intervals from .25 to 10 seconds
3 seconds standard, adjustable in .25
second intervals from .25 to 10 seconds
Ambient Operating Environment -40° to 158°F (-40° to 70°C) / 10% to 100% RH non-condensing
Ambient Temperature Coefficient Maximum of 0.003°/°C over Ambient Operating Temperature Range from 23°C ± 5°C
Sensor/Probe
• Sensor - 4-wire RTD, R0 = 100 Ω , Alpha = .00385 Ω / Ω / °C with serial ID chip
• 304 or 316L Stainless Steel Probe construction
• Adjustable Angle Stem Probes
• Rigid Stem Probes
• Remote Probes with rugged IP68 connection system.
• Sanitary Fittings in compliance with 3A Sanitary Standard 74-06
Sensor Cables PVC insulation, shielded, 6 conductor, 105°C rating
Power 1 Lithium Thionyl Chloride “C” Battery, User Replaceable 1 AA Battery, User Replaceable
Battery Life 2 years nominal at 2 second update interval 1 year nominal at 3 second update interval
NIST Calibration Optional NIST Traceable Certificate of Conformance at 3 points: 180°F, 220°F, 250°F
(For User Specified Fixed Points please contact Customer Service)
Programming & Calibration Software Optional: DSTCAL Calibration Software
Enclosure DST600 Series: Stainless Steel Enclosure with Polycarbonate H Frame and Window (NEMA 4X)
DST640 Series: All Stainless Steel Enclosure with Polycarbonate Window (NEMA 4X)
Enclosure Dimensions/Weight Dimensions: 5.3" W x 4.3" H x 2.7" D (13.5 x 10.9 x 6.9 cm). Weight: 2 lbs. (1kg)
Complete Calibration Services Available
[phone] • FAX [phone] • www.palmerwahl.com
DSTCAL DST600 Series Calibration Software Kit
12370-002 DST600 Series Interconnect Calibration Cable - 2 meter length, 6 conductor
13500-03 DST600 Series Fixed Probe Calibration Cable
DSA3030 Wall Mount Bracket (for Remote Mount units)
DSA3031 Wall Mount Bracket (for Remote Mount units) with Grounding Lug
DSA3032 Security Screw Kit (Screws, washers, security wire seal, instructions. Installed when purchased with meter)
DSA3033 Security Wire Seals, Tamper-Resistant, 10/pack, Toolless, 8", SS Wire
DSA3062 Spare Lithium Thionyl Chloride “C” Battery, 3.6V, for all DST meters except FM version
12234-03
DS-M Calibration & Firmware Upgrades (Upgrades if applicable, included in price)
DST6NIST
NIST Traceable Certificate of Conformance of System & Firmware Upgrades*Standard Set Test Points
DST6NIST-1
NIST Traceable Certificate of Conformance of System & Firmware Upgrades*User Specified Test Points
13146X 90 Degree Elbow for Rigid stem units, Specify X: Back Connection(B), Left(L) or Right Side(R) Mount
Specifications subject to change
without notice
*Upgrades if applicable, are included in price
7. Specifications – DST600 / DST640 Series

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8. DST610/650, DST611/651, DST620/660, and DST621/661
Models DST610/650, DST611/651, DST620/660 and DST621/661 are variations
of the DST600/640 that include an isolated secondary sensor housed in the
same probe shank. This enables the user to have an independent signal from
the same probe for use by a controller or recorder.
8.1. DST610/650 – Consists of DST600/640 meter with an isolated secondary
sensor and terminal block. The DST610/650 provides an isolated
secondary RTD for independent external use allowing the user to have an
additional measuring circuit located in the same probe shank. This
reduces the number of penetrations made into the process and reduces
error due to non-uniformity of the process.
8.1.1. Connection is made via a 4-circuit terminal strip (see Fig. 4). A ½”
NPT female fitting on the side of the enclosure allows access to
connections. This connection should be sealed to prevent moisture,
water or dust entry. We recommend using a liquid-tight conduit fitting
or cable gland for wire entry. User may use in a 2, 3 or 4 wire
configuration as shown in Figure A1.
8.1.2. Secondary RTD specifications are as follows:
R0
100 ohms per DIN EN 60751
Accuracy
Class A per DIN EN 60751
Temperature coefficient
TCR = 3850 ppm/K
Connection
Factory wired for 4-wire, user selectable 2,
3, or 4-wire connection
Self-heating
0.4 K/mW at 0°C
Measuring current
0.3 to 1.0 mA, self-heating must be
considered
Terminal Block type
Euro style
Maximum wire size
10 AWG
Fig. 6 – DST610/650 Terminal Block Wiring

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8.2. DST611/651 - All the features of the DST610/650, and includes a pre-
wired Turck 4-pin connector mounted in the side enclosure fitting. This
allows convenient user connection/disconnection. This option requires
the use of a connecting cable or connector (ordered separately).
Connector wiring are shown in Figure A2.
8.2.1. Optional IP68 rated field wireable connectors and cables:
Wahl P/N Description
12075-07 Straight field wireable connector, 4-6 mm cable gland
12075-08 Straight field wireable connector, 6-8 mm cable gland
12075-09 Right angle field wireable connector, 4-6 mm cable gland
12075-10 Right angle field wireable connector, 6-8 mm cable gland
Cable assemblies are single-ended and feature a molded IP68 rated
connector. Opposite end is left un-stripped. Insulation is PVC and rated
to 105°C.
Wahl P/N Description
12361-xxx xxx denotes length in meters, i.e. 12361-010 is 10-meter
cable, 12361-120 is 120-meter length.
Connections for 12361 cable for DST611/651 are as follows:
Wire Color
Connection
Signal
Brown
Pin 1
Excite +
White
Pin 2
RTD +
Blue
Pin 3
RTD -
Black
Pin 4
Excite -
Non-insulated
Coupling nut
Shield*
*Shield lead should not be terminated if either meter housing or
probe shank is grounded, to avoid ground loops.
Fig. 7 – DST611/651 connector wiring

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8.3. DST620/660 – Consists of DST600/640 meter with an isolated secondary
sensor and 4-20 mA programmable transmitter. Transmitters are
programmed at the factory. The DST620/660 provides an isolated
current output from the same probe shank. This reduces the number of
penetrations made into the process and reduces error due to non-
uniformity of the process.
8.3.1. Connection is made by hardwiring to the transmitter power supply
terminals as shown in Figure 8. A ½” NPT female fitting on the side
of the enclosure allows access to connections. This connection
should be sealed to prevent moisture, water or dust entry. We
recommend using a liquid-tight conduit fitting or cable gland for wire
entry.
8.3.2. Secondary RTD/transmitter specifications are as follows:
R0
100 ohms per DIN EN 60751
Accuracy
Class A per DIN EN 60751
Temperature coefficient
TCR = 3850 ppm/K
Connection
4-wire
Programming
PC programming (optional cable required)
Power Supply Req.
10 to 35 VDC
Range
-58°F to 500°F (-50 to 260°C)
Accuracy
Greater of ±0.4°F or .1% ±(0.2°C or .1%)
Fault monitoring
Programmable Hi (>21.6 mA) or Low (<3.5 mA)
8.4. DST621/661 - All the features of the DST620/660, and includes a Turck
4-pin connector mounted in the side enclosure fitting that is pre-wired to
the transmitter. This allows convenient user connection/disconnection.
This option requires the use of a connecting cable or connector (ordered
separately). Connector wiring and cable wiring are shown in Figure 9.
See below for connectors and cables:
Fig. 8 – DST620/660 transmitter connection
Programming
Port
IOUT +
IOUT -
OR
RTD Input

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8.4.1. Optional IP68 rated field wireable connectors and cables:
Wahl P/N Description
12075-07 straight field wireable connector, 4-6 mm cable gland
12075-08 straight field wireable connector, 6-8 mm cable gland
12075-09 right angle field wireable connector, 4-6 mm cable gland
12075-10 right angle field wireable connector, 6-8 mm cable gland
Cable assemblies are single-ended and feature a molded IP68 rated
connector. Opposite end is left un-stripped. Insulation is PVC and rated
to 105°C.
Wahl P/N Description
12361-xxx xxx denotes length in meters, i.e. 12361-010 is 10-meter
cable, 12361-120 is 120-meter length.
Connections for 12361 cable for DST621/661 are as follows:
Wire Color
Connection
Signal
Brown
Pin 1
Current out + (+V DC)
White
Pin 2
Current out – (-V DC)
Blue
Pin 3
N/C
Black
Pin 4
N/C
Non-insulated
Coupling nut
Shield*
*Shield lead should not be terminated if meter housing or probe shank is
grounded, to avoid ground loops.
Figure 9 – DST621/661

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WARRANTY
DST610 - 620 S ERIES / DST650 - 660 S ERIES RTD M ETER S PECIFICATIONS
Standard Series DST610 DST611 DST620 DST621
All Stainless Steel Series, Increased
RFI Protection DST650 DST651 DST660 DST661
Model RTD Meter with Local Display and Isolated Second RTD Sensor
Isolated Secondary Sensor
Internal Terminal Block 4-20mA Transmitter
1/2" NPT Female Connector Turck 4 pin Connector 1/2" NPT Female Connector Turck 4 pin Connector
DISPLAY SPECIFICATIONS
Meter Range / Scale -50° to 500°F (-45.5° to 260°C) / User Selectable for °F or °C
Meter Accuracy ± 0.1°F/C, over 1-year period (@ Tamb = 23°C ± 5°C)
Meter and Probe Accuracy Temp ≤300°F (148.8°C) = ± 0.3°F (± 0.2°C), Temp > 300°F (148.8°C) = ± 0.25% of reading
Display 1.0" 4-digit LCD display with icons for °F, °C and Low Battery, Readable up to 30 ft.
Display Resolution 0.1°F/C
Sample/Display Rate 2 seconds standard, adjustable in .25 second intervals from .25 to 10 seconds
Ambient Operating Environment -40° to 158°F (-40° to 70°C) / 10% to 100% RH non-condensing
Ambient Temperature Coefficient Maximum of 0.003°/°C over Ambient Operating Temperature Range from 23°C ± 5°C
Sensor/Probe
• Sensor - 4-wire RTD, R0 = 100Ω, Alpha = 0.00385 Ω/Ω/°C w/ serial ID chip
• 304 or 316L Stainless Steel Probe construction
• Adjustable Angle Stem Probes
• Rigid Stem Probes
• Remote Probes with rugged IP68 connection system
• Sanitary Fittings (3A Sanitary Std 74-06)
• Models 610/650, 611/651, 620/660, 621/661 - 3/8" & 1/2" OD Shank & Tapered Bulbs only
Sensor Cables PVC insulation, shielded, 6 conductor, 105°C rating
SECONDARY RTD SPECIFICATIONS
RO 100 ohms per DIN EN 60751 100 ohms per DIN EN 60751
Accuracy Class A per DIN EN 60751 Class A per DIN EN 60751
Temperature Coefficient TCR = 3850 ppm/k TCR = 3850 ppm/k
Connection Factory wired for 4-wire,
user selectable 2, 3 or 4 wire 4-wire
Self-Heating 0.4 K/mW at 0°C NA NA
Measuring Current 0.3 to 1.0 mA, self-heating
must be considered NA NA
Terminal Block Type Euro Style NA NA
Maximum Wire Size 10 AWG NA NA
TRANSMITTER SPECIFICATIONS
Programming NA NA PC Programming*
Power Supply Requirements NA NA 10 to 35 Volts DC
Range NA NA -58° to 500°F (-50° to 260°C)
Accuracy NA NA Greater of 0.1°C or 0.05% of input span
Fault Monitoring NA NA Programmable High (> 21.6 mA),
Programmable Low (< 3.5 mA)
Power One Lithium Thionyl Chloride “C” Battery, User Replaceable
Battery Life 2 years nominal at 2 second update interval
NIST Calibration Optional NIST Traceable Certificate of Conformance at 3 points: 180°F, 220°F, 250°F
(For User Specified Fixed Points please contact Customer Service)
Programming & Calibration Software Optional: DSTCAL Calibration Software
Enclosure DST610/DST620 Series: Stainless Steel Enclosure with Polycarbonate H Frame and Window (NEMA 4X)
DST650/DST660 Series: All Stainless Steel Enclosure with Polycarbonate Window (NEMA 4X)
Dimensions/Weight 5.3" W x 4.3" H x 2.7" D (13.5 x 10.9 x 6.9 cm). / 2 lbs. (1kg)
*Factory Programmable or optional programmimg kit required. Specifications subject to change without notice.
9. Specifications – DST610/650, DST611/651, DST620/660, DST621/661

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10. Service - For calibration, service or technical support, contact Wahl
Instruments at: Toll Free: 800-421-2853, or Phone: [phone], or email
[email protected].
11.Panel Mount Instructions
The Panel Mount system for Wahl Digi-Stem is designed for use with panels from
1/8” to 3/8” thickness. The system uses a square O-ring to seal around the
meters H-Frame and the panel. The unit is secured by a U-bracket with 2 #8
wing nuts and lock washers.
For Panel cutout dimensions and installation reference Wahl Drawing 13615.
(see below)
1) Remove Hardware and bracket from mounting studs on rear of meter
enclosure.
2) Ensure the square O-ring is installed flat against the H-frame and is not
twisted.
3) Slide the meter from the front surface of the panel through the panel opening.
4) Install the U bracket over the mounting studs with the short arms facing the
rear side of the panel.
5) Install a lock washer and wing nut onto the studs.
6) Gently tighten the wing nuts until they just start tightening. The bracket should
not be deflected more than 0.020” (approximately ¾to 1 turn after touching).
CAUTION: Excessive force may result in bending and fracturing the U bracket or
damaging the mounting studs.

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12. 13516 Panel Mount Drawing

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ISO 9001:2008
CERTIFIED QUALITY
MANAGEMENT SYSTEM
13. See Addendum – WD1053 Battery Install & Shipping Instructions
234 Old Weaverville Road, Asheville, NC 28804
Toll Free: 800-421-2853 • Phone: [phone] • Fax: [phone]
www.palmerwahl.com
[e-mail]