Det-Tronics UD20 User manual

4.1 Rev: 6/15 95-8620
Instructions
FlexVu®Explosion-Proof
Universal Display Unit
Model UD20

Table Of Contents
APPLICATION ..............................1
DESCRIPTION ..............................1
HART Communication .....................1
Magnetic Switches........................2
Device Enclosure.........................2
Device Display ...........................2
Logging ................................2
Output Test .............................2
IMPORTANT SAFETY NOTES .................3
INSTALLATION .............................3
Identication of Vapor(s) to be Detected .......3
Identication of Detector Mounting Locations ...4
Device Mounting Orientation ................4
Sensor Separation ........................4
WIRING ...................................4
Power Supply Requirements ................4
Wiring Cable Requirements.................5
Wiring Procedure .........................5
CALIBRATION ..............................9
General Calibration Information..............9
Calibration Procedure ....................10
Input Trim ..............................11
SPECIFICATIONS ..........................11
DEVICE REPAIR AND RETURN ...............14
ORDERING INFORMATION ..................14
APPENDIX A —HART COMMUNICATION
WITH GT3000 .............................15
APPENDIX B — HART COMMUNICATION
WITH PIRECL..............................17

INSTRUCTIONS
FlexVu®Explosion-Proof
Universal Display Unit
Model UD20
Im porta n t
Be sure to read and understand the entire
instruction manual before installing or operating
the gas detection system. The Model UD20 is to
be used with GT3000 or PIRECL gas detectors
to provide early warning of the presence of a gas
mixture. Proper device installation, operation,
and maintenance is required to ensure safe and
effective operation. If this equipment is used in
a manner not specied in this manual, safety
protection may be impaired.
ApplicAtion
The FlexVu®Model UD20 Universal Display Unit is
designed to be used with the GT3000 Toxic Gas
Detector or PIRECL Combustible Gas Detector.
The UD20 functions as a pass through device, reading
the linear 4-20 mA dc output signal from the gas
detector. The detected gas concentration is indicated
on an alpha-numeric display. The UD20 automatically
detects the gas type and operating range of the sensor
to which it is connected via the HART signal.
All electronics are enclosed in an explosion-proof
aluminum or stainless steel housing. The display unit
is used with a single gas detector, which may be either
directly coupled to the display unit, or remotely located
using a sensor termination box. The UD20 features
non-intrusive calibration, which can be performed by
using a handheld magnet to activate internal magnetic
switches on the faceplate. Calibration can also be
performed by activating the gas detector’s internal
magnetic reed switch with a magnet.
Description
The UD20 provides display and control capabilities for the
GT3000 or PIRECL detector, and uses the following I/O:
Signal Inputs: 4-20 mA loop with HART,
from the gas detector
User Inputs: Magnetic switches (4),
on the display panel
Visible Outputs: LCD display
Signal Pass Through: 4-20 mA loop with HART,
from the gas detector
HART COMMUNICATION
The UD20 is a HART primary master and communicates
with the gas detector, which is a HART slave device.
Upon power-up, the UD20 requests the gas type,
measurement range, and unit of measure from the gas
detector. During normal operation, the UD20 continually
polls the gas detector for status information. Because
the UD20 is a primary master, a secondary master can
also be used to communicate with the gas detector at
the same time. If an Asset Management System (AMS)
is used, it should be configured as a secondary master
to avoid communication conflicts with the UD20.
4.1 ©Detector Electronics Corporation 2016 Rev. 6/15 95-8620

4.1 95-86202
MAGNETIC SWITCHES
Four internal magnetic switches provide a non-intrusive
user interface that allows adjustment of configuration
parameters and calibration in the field without the use
of a HART handheld device. The switches are labeled
as follows:
Cancel, Escape
Enter, Select
Previous
Next
DEVICE ENCLOSURE
The housing for the UD20 consists of a multi-port
aluminum or stainless steel explosion-proof junction
box with a clear viewing window. Available conduit
entry sizes include 3/4” NPT and M25.
DEVICE DISPLAY
The UD20 is provided with a 160 x 100 dot matrix
LCD display. See Figure 1. During normal operation,
the UD20’s LCD display indicates the gas type and
units measured. The UD20 communicates with the
sensor and allows easy access to various operating
parameters. Refer to Appendix A or B for details.
GAS LEVEL INDICATION
The UD20 display shows “100+” to indicate an over-
range condition. For an under-range condition, the
gas level indication is 0%. Actual gas level can be
determined using the UD20 menu: “PROCESS VARS”
> ANALOG INPUT XX.XX mA.
SPECIAL STATES
Special states other than normal operation and warm-
up require user action for activation. These include
Calibration, Display / Sensor Configuration, Display /
Sensor Status, and Fault indication. Refer to Appendix
A (UD20 with GT3000) or Appendix B (UD20 with
PIRECL) for details regarding the HART menu structure.
WRITE PROTECT
The write protect function in the sensor can be accessed
by the UD20.
LOGGING
The UD20 has no logging capability of its own, but
reads the logs that are stored in the gas detector and
displays them on the LCD screen. If an AMS is used,
it communicates directly with the gas detector and not
with the UD20.
GT3000 or PIRECL
GAS
DETECTOR
UD20
CONTROL
SYSTEM
Operating and history logs that are stored in the gas
detector and displayed by the UD20 include:
•Calibration
•Sensorrunninghours
•Sensortemperature
•Events
OUTPUT TEST
The UD20 can start and stop a 4-20 mA Loop Test for
checking correct operation of system output devices.
CANCEL / ESCAPE
ENTER / SELECT
PREVIOUS
NEXT
B2426
Figure 1—Faceplate of UD20

4.1 95-86203
FAULT CONDITIONS WHEN USED WITH PIRECL
When the UD20 is connected to the PIRECL, it
automatically programs the PIRECL for “User Defined
Fault Mode” upon power-up and sets the following
default output levels:
Calibration = 3.8 mA
Warm-up, General Fault, Blocked Optics = 3.0 mA
This is done to ensure that the loop current stays high
enough to keep the UD20 powered. The UD20 is a loop
powered device and requires a minimum of 2.6 mA to
operate properly. Setting the fault level to a value other
than default is not recommended.
If the UD20 is unable to change the mode, an “ANALOG
CODE FLT” fault is annunciated.
Refer to the PIRECL instruction manual, number 95-
8526, for complete information regarding fault detection
and fault modes.
Zero Drift Condition
Zero Drift Faults are not specifically indicated by the
UD20. When the process variable drops between 3.9
and 3.1 mA, no fault is indicated by the UD20. When the
process variable reaches 3.0 mA, the UD20 will display
a FAULT. If a FAULT condition is indicated, the user can
interrogate UD20 and PIRECL fault conditions within
the UD20 menu. If no specific fault is indicated, use the
menu to determine the PIRECL process variable. If that
value is ≤3.9 mA, the PIRECL is experiencing zero drift
and should be re-calibrated.
importAnt sAfety notes
CaUtIon
The wiring procedures in this manual are intended
to ensure proper functioning of the device under
normal conditions. However, because of the
many variations in wiring codes and regulations,
total compliance to these ordinances cannot be
guaranteed. Be certain that all wiring complies
with the NEC as well as all local ordinances. If
in doubt, consult the authority having jurisdiction
before wiring the system. Installation must be
done by a properly trained person.
CaUtIon
This product has been tested and approved
for use in hazardous areas. However, it must
be properly installed and used only under the
conditions specied within this manual and
the specic approval certicates. Any device
modication, improper installation, or use in a
faulty or incomplete conguration will render
warranty and product certications invalid.
CaUtIon
The device contains no user serviceable
components. Service or repair should never be
attempted by the user. Device repair should be
performed only by the manufacturer or trained
service personnel.
LIabILItIes
The manufacturer’s warranty for this product is
void, and all liability for proper function of the
Display is irrevocably transferred to the owner or
operator in the event that the device is serviced or
repaired by personnel not employed or authorized
by Detector Electronics Corporation, or if the
device is used in a manner not conforming to its
intended use.
CaUtIon
Observe precautions for handling electrostatic
sensitive devices.
CaUtIon
Unused entries must be closed with suitably
certied blanking elements upon installation.
instAll Ation
NOTE
The UD20 housing must be electrically connected
to earth ground. A dedicated earth ground
terminal is provided on the UD20.
Install gas detectors in the appropriate locations
following the guidelines below. The UD20 should be
located where it can be easily viewed by personnel. The
GT3000 can be attached directly to the UD20 housing,
or it can be mounted remotely using a Det-Tronics STB
termination box (see the “Sensor Separation” section
for additional information). The Model PIRECL should
be mounted as described in the PIRECL instruction
manual, number 95-8526. Detectors must always be
installed per local installation practices.
Always define the following application details:
IDENTIFICATION OF VAPOR(S) TO BE DETECTED
It is necessary to always identify the vapor(s) of interest
at the job site. In addition, the fire hazard properties
of the vapor, such as vapor density, flashpoint, and
vapor pressure should be identified and used to assist
in selecting the optimum detector mounting location
within the area.

4.1 95-86204
IDENTIFICATION OF DETECTOR MOUNTING
LOCATIONS
Identification of the most likely leak sources and
leak accumulation areas is typically the first step in
identifying the best detector mounting locations. In
addition, identification of air current / wind patterns
within the protected area is useful in predicting gas leak
dispersion behavior. This information should be used to
identify optimum sensor installation points.
If the vapor of interest is lighter than air, place the sensor
above the potential gas leak. Place the sensor close to
the floor for gases that are heavier than air. Note that air
currents may cause a gas that is slightly heavier than
air to rise under some conditions. Heated gases may
also exhibit the same phenomenon.
The most effective number and placement of detectors
varies depending on the conditions at the job site. The
individual designing the installation must often rely on
experience and common sense to determine the detector
quantity and best locations to adequately protect the
area. Note that it is typically advantageous to locate
detectors where they are accessible for maintenance.
Locations near excessive heat or vibration sources
should be avoided if possible.
Final suitability of possible gas detector locations
should be verified by a job site survey.
For locations with expected periodic temperature
conditions from –20°C to –40°C, a certified heater jacket
system must be applied, and the installation should be
accepted by the local authority having jurisdiction.
DEVICE MOUNTING ORIENTATION
The GT3000 detector must be mounted in a vertical
position only, with the sensor pointing down. See Figure
2. For details on mounting the PIRECL detector, refer to
manual number 95-8526.
Im porta n t
The GT3000 must be oriented with the LEDs
facing forward so they are easily visible to
personnel within the area. To ensure correct
orientation (the LEDs are not visible when power
is off), position the GND lug on the left hand side
and the calibration notch to the front. Note that the
LEDs are located directly above the calibration
notch.
SENSOR SEPARATION
Det-Tronics sensor termination boxes (Model STBs)
enable the installation of the GT3000 separately from
the UD20 Universal Display Unit. Two-conductor
shielded cable is required to prevent possible nuisance
EMI/RFI.
The PIRECL contains its own termination box for sensor
separation from the UD20.
The maximum cable length between the termination
box and the UD20 is 2000 ft.
WirinG
POWER SUPPLY REQUIREMENTS
Calculate the total gas detection system power
consumption rate in watts from cold start-up. Select a
power supply with adequate capability for the calculated
load. Ensure that the selected power supply provides
regulated and filtered 24 Vdc output power for the
entire system. If a back-up power system is required,
a float-type battery charging system is recommended.
If an existing source of 24 Vdc power is being utilized,
verify that system requirements are met.
NOTE
The UD20 and GT3000/PIRECL communicate
using HART protocol, which requires a power
supply with low noise levels for proper operation.
(For detailed information regarding power supply
specications, refer to the HART Communication
Foundation’s document “FSK Physical Layer
Specication” HCF_SPEC-54.)
GREEN LED
CALIBRATION NOTCH
B2436
GND LUG
Figure 2—Correct Mounting Orientation

4.1 95-86205
WIRING CABLE REQUIREMENTS
Always use proper cabling type and diameter for input
power as well as output signal wiring. 22 to 14 AWG
shielded stranded copper wire is recommended.
Always install a properly sized, master power fuse or
breaker on the system power circuit.
For ambient temperatures below –10°C, use field wiring
suitable for the expected conditions. For ambient
temperatures above +60°C, use field wiring and cable
glands suitable for 15°C above the maximum expected
conditions.
NOTE
The use of shielded cable in conduit or shielded
armored cable is required. In applications where
the wiring is installed in conduit, dedicated
conduit is recommended. Avoid low frequency,
high voltage, and non-signaling conductors to
prevent nuisance EMI problems.
CaUtIon
The use of proper conduit installation techniques,
breathers, glands, and seals is required to prevent
water ingress and/or maintain the explosion-proof
rating.
JUNCTION BOX ENTRIES, PLUGS, & FITTINGS
WarnInG
All entries must contain appropriately rated
plugs or ttings. It is required that each plug or
tting be wrench-tightened to an appropriate
installation torque and meet the minimum thread
engagement requirements per the applicable
local standards, codes, and practices in order
to retain the dened ratings. PTFE sealant or
equivalent should be used on NPT threads.
WIRING PROCEDURE
UD20 with GT3000
Refer to Figures 3 and 4 for wiring illustrations.
UD20 with PIRECL
No separate power lines are required for the UD20.
The device can be powered off the PIRECL detector in
a two-wire configuration. Figures 5 through 8 illustrate
the Eclipse wired to a UD20 with the 4-20 mA output
shown in various wiring schemes.
A 250 ohm, 3 watt HART resistor must be installed.
The current loop resistance must not exceed 440 ohms
for correct functioning of the detector mA output and
HART signal.
Figure 9 shows the UD20 with the optional Bartec Self-
Regulating Heating Cable System.
+
–
24 VDC
UD20 DISPLAY UNIT
B2406
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
J2
NOTE 1 CONNECT THE GREEN SENSOR LEAD TO THE CHASSIS GROUND LUG
ON THE INSIDE BOTTOM OF THE UD20 DISPLAY UNIT ENCLOSURE.
NOTE 2 250 OHM, 3 WATT RESISTOR REQUIRED (INCLUDED).
NOTE 3 EXTERNAL HART COMMUNICATION DEVICES CAN BE CONNECTED ACROSS
THE 250 OHM RESISTOR, ACROSS J2-5 AND J2-6, OR ACROSS J2-2 AND J2-3.
NOTE 4 JUNCTION BOX MUST BE ELECTRICALLY CONNECTED TO EARTH GROUND.
NOTE 5 GROUND THE SHIELD AT THE POWER SOURCE END ONLY.
SEE NOTES 2 AND 3
SEE NOTE 5
GT3000
GAS DETECTOR
+
+
–
–
SHIELD
SHIELD
SENSOR
LOOP
POWER
LOOP
BLACK
RED
GREEN SEE NOTE 1
HAZARDOUS LOCATION NON-HAZARDOUS LOCATION
Figure 3—Basic Wiring for Explosion Proof UD20 with GT3000

4.1 95-86206
B2688
24 VDC –
24 VDC –
24 VDC +
24 VDC +
CALIBRATE
+ 4-20 MA
– 4-20 MA
1
2
3
4
5
6
7
PIRECL
POINTWATCH ECLIPSE
NOTE 1 JUNCTION BOXES MUST BE ELECTRICALLY CONNECTED TO EARTH GROUND.
NOTE 2 THE TOTAL LOOP RESISTANCE = 250 OHMS MINIMUM, 440 OHMS MAXIMUM.
UD20
DISPLAY UNIT
SENSOR +
POWER +
SENSOR –
POWER –
SHIELD
SHIELD
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
V +
V –
SIGNAL
250Ω
3 WATT
ANALOG INPUT / POWER
Figure 5—PIRECL Detector Wired to UD20 (Non-Isolated 4-20 mA Output, Sinking, 4-Wire)
+
–
24 VDC
UD20 DISPLAY UNIT
B2483
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
J2
NOTE 1 GROUND THE SHIELD AT THE POWER SOURCE END ONLY.
NOTE 2 250 OHM, 3 WATT RESISTOR REQUIRED (INCLUDED).
NOTE 3 EXTERNAL HART COMMUNICATION DEVICES CAN BE CONNECTED ACROSS
THE 250 OHM RESISTOR, ACROSS J2-5 AND J2-6, OR ACROSS J2-2 AND J2-3.
NOTE 4 JUNCTION BOXES MUST BE ELECTRICALLY CONNECTED TO EARTH GROUND.
BLACK
RED
SEE NOTE 1
SEE NOTES 2 AND 3
SEE NOTE 1
GT3000
GAS DETECTOR
SENSOR TERMINATION BOX
RED
RED
BLACK
BLACK
GREEN +
+
–
–
SHIELD
SHIELD
SENSOR
LOOP
POWER
LOOP
HAZARDOUS LOCATION NON-HAZARDOUS LOCATION
Figure 4—Basic Wiring for Explosion Proof UD20 and GT3000 with Terminal Box

4.1 95-86207
B2689
24 VDC –
24 VDC –
24 VDC +
24 VDC +
CALIBRATE
+ 4-20 MA
– 4-20 MA
1
2
3
4
5
6
7
PIRECL
POINTWATCH ECLIPSE
NOTE 1 JUNCTION BOXES MUST BE ELECTRICALLY CONNECTED TO EARTH GROUND.
NOTE 2 THE TOTAL LOOP RESISTANCE = 250 OHMS MINIMUM, 440 OHMS MAXIMUM.
UD20
DISPLAY UNIT
SENSOR +
POWER +
SENSOR –
POWER –
SHIELD
SHIELD
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
V +
V –
SIGNAL
250Ω
3 WATT
ANALOG INPUT / POWER
Figure 6—PIRECL Detector Wired to UD20 (Non-Isolated 4-20 mA Output, Sourcing, 4-Wire)
B2690
24 VDC –
24 VDC –
24 VDC +
24 VDC +
CALIBRATE
+ 4-20 MA
– 4-20 MA
1
2
3
4
5
6
7
PIRECL
POINTWATCH ECLIPSE
NOTE 1 JUNCTION BOXES MUST BE ELECTRICALLY CONNECTED TO EARTH GROUND.
NOTE 2 THE TOTAL LOOP RESISTANCE = 250 OHMS MINIMUM, 440 OHMS MAXIMUM.
UD20
DISPLAY UNIT
SENSOR +
POWER +
SENSOR –
POWER –
SHIELD
SHIELD
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
V +
V –
SIGNAL
250Ω
3 WATT
ANALOG INPUT / POWER
V +
V –
POWER SUPPLY
Figure 7—PIRECL Detector Wired to UD20 (Isolated 4-20 mA Output, Sinking, 4-Wire)

4.1 95-86208
B2691
24 VDC –
24 VDC –
24 VDC +
24 VDC +
CALIBRATE
+ 4-20 MA
– 4-20 MA
1
2
3
4
5
6
7
PIRECL
POINTWATCH ECLIPSE
NOTE 1 JUNCTION BOXES MUST BE ELECTRICALLY CONNECTED TO EARTH GROUND.
NOTE 2 THE TOTAL LOOP RESISTANCE = 250 OHMS MINIMUM, 440 OHMS MAXIMUM.
UD20
DISPLAY UNIT
SENSOR +
POWER +
SENSOR –
POWER –
SHIELD
SHIELD
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
V +
V –
SIGNAL
250Ω
3 WATT
ANALOG INPUT / POWER
V +
V –
POWER SUPPLY
Figure 8—PIRECL Detector Wired to UD20 (Isolated 4-20 mA Output, Sourcing, 4-Wire)
Figure 9—UD20 with Bartec Self-Regulating Heating Cable System
A2693
NON-HAZARDOUS LOCATION CLASS I, DIV. 2 HAZARDOUS LOCATION
HEATER
POWER SUPPLY
GAS DETECTOR
POWER SUPPLY
GAS DETECTOR
CONTROL
GAS
DETECTOR
BARTEC HEATER
JUNCTION BOX
UD20
HEATER CABLE
HEATER JACKET
TEMP CONTROL LIMIT
MAXIMUM = 20°C

4.1 95-86209
cAlibrAtion
The calibration process is automatic, with the exception
of gas delivery. LEDs on the gas detector and messages
on the UD20 faceplate guide the operator when to apply
and remove the calibration gas. See Tables 1 and 2.
NOTE
The UD20 allows the operator to adjust the
calibration gas concentration within the range of
30 to 90% full scale. The default value for all gas
sensors except oxygen is 50% full scale. Oxygen
sensors use a default value of 20.9%.
GENERAL CALIBRATION INFORMATION
All GT3000 and PIRECL Gas Detectors provide a two-
point calibration — zero and span.
The calibration process can be initiated using the
magnetic switch on the gas detector or using the
magnetic switches on the UD20 faceplate. All sensors,
including oxygen, should be in clean air (20.9% oxygen)
when the calibration sequence is initiated.
Once calibration is initiated, the process proceeds
automatically. The yellow LED on the gas detector and
the digital display on the UD20 are used to inform the
operator of the progress of the calibration procedure,
and also signal when to apply and when to remove the
calibration gas.
The calibration can be aborted after zero calibration by
activating the magnetic switch on the gas detector or
navigating the UD20 menu.
Device Status Green LED Yellow LED
Normal Steady On Off
Waiting for Zero Off Steady On
Waiting for Gas Off Blinking
Waiting for Span Off Blinking
Remove Cal Gas Off Off
Normal Steady On Off
Table 1— GT3000 LEDs During Calibration
Table 2—PIRECL LEDs and Current Output Status During Normal Calibration Procedure
Description Indicating LED
(on-board/PIRTB)
Operator Action
Normal-ready to calibrate steady green/off Purge with clean air if required
Initiate Calibration steady red/on-steady Apply Magnet for 2 seconds min.
Zero Calibration complete flashing red/on-flashing Apply Calibration Gas to device
Span Calibration in progress flashing red/on-flashing Continue cal gas flow
Span Calibration complete off/on-steady Remove Calibration Gas
Output Returns to Normal steady green/off Calibration Completed
Normal Operation steady green/off None

4.1 95-862010
If the calibration sequence is aborted or not completed
successfully, the detector reverts back to the previous
calibration values and signals a calibration fault. If
a successful calibration cannot be performed, the
calibration fault can be cleared by activating the
magnetic switch on the gas detector for one second.
For help assessing when a fault has occurred see
Tables 3 and 4.
The calibration process can fail for the following causes:
•Zeroisoutofrange
•Spanisoutofrange
•Time-Out.
The time and date of calibration events are logged
in the GT3000’s non-volatile memory along with the
calibration outcome. Possible calibration scenarios
include the following:
•SuccessfulCalibration
•AbortedCalibration
•FailedCalibration
NOTE
The calibration procedure must be completed
within a ten minute period. If the calibration is not
completed, a calibration fault will be generated
and the previous calibration data will be used.
NOTE
To ensure reliable protection, it is important to
check and calibrate the detection system on a
regularly scheduled basis. The frequency of these
checks is determined by the requirements of the
particular installation – typically 30, 60, or 90 day
intervals, depending on the ambient conditions.
CALIBRATION PROCEDURE
1. Clean air must be present at the sensor prior
to initiating calibration. The use of bottled air is
recommended.
2. Calibration can be initiated in one of two ways:
A. Hold the calibration magnet against the
designated location on the sensor module
(see Figures 10 and 11) until the green LED
turns off and the yellow LED turns on steady
(approximately one second).
B. Initiate calibration via the magnetic switches on
the UD20. Select Main Menu > Device Cal >
Calibration > Execute.
The UD20 indicates “Waiting for Zero.” The
transmitter immediately begins taking zero readings.
LED
PLACE MAGNET HERE
TO ACTIVATE INTERNAL
MAGNETIC SWITCH
A2452
Figure 10—Location of Magnetic Switch on GT3000 Detector
Table 3— GT3000 LEDs and 4-20 mA Output
During Various Status Conditions
Function Green
LED
Yellow
LED
Analog
4-20 mA
Signal
Warm-up Off Steady On 3.5
Normal
Operation Steady On Off 4-20
Fault
Condition Off Steady On 3.5
Calibration See Table 1 3.8
CALIBRATION MAGNET
CALIBRATION NOZZLE
WEATHER BAFFLE
MULTICOLOR LED
HART COMMUNICATION PORT
(COVER INSTALLED)
PLACE CALIBRATION MAGNET
HERE TO ACTIVATE INTERNAL
REED SWITCH
C2058
EARTH GND LUG
Figure 11— Location of Magnetic Switch on PointWatch Eclipse

4.1 95-862011
3. When the zero calibration is complete, the yellow
LED changes from steady to blinking and the UD20
indicates “Waiting for Gas.” Apply the calibration
gas to the sensor. When gas is detected, the UD20
indicates “Waiting for Span.”
4. When the yellow LED turns off and the UD20
indicates “Remove Cal Gas”, remove the calibration
gas. The gas level at the sensor gradually returns to
zero. The green LED turns on steady to indicate that
the device has returned to normal operation, using
the new calibration data.
INPUT TRIM
The input current loop of the UD20 is trimmed at the
factory. However, it can also be trimmed in the field
using the following automated process.
Navigate through the menu to “Input Loop Cal.”
Main Menu
Process Vars
Display Status
Device Status
Display Setup
Device Setup
Device Cal
Device Test
Display Setup
Contrast Control
Input Loop Cal
Upon entering Input Loop Cal, the UD20 commands
the detector to output 4 mA, and then automatically
calibrates its own input. The UD20 then commands the
detector to output 20 mA, and subsequently calibrates
its own input.
specificAtions
UD20 UNIVERSAL DISPLAY UNIT
OPERATING VOLTAGE—
24 Vdc nominal, operating range is 19 to 30 Vdc.
UD20 maximum loop voltage drop (Vd) 5.0 volts.
Maximum loop supply 30.0 Vdc.
OPERATING POWER—
0.8 watt maximum.
OPERATING CURRENT—
A minimum of 3.5 mA.
CURRENT OUTPUT—
Linear 4-20 mA
(with HART output directly from detector).
250 ohm, 3 watt termination resistor required (included).
OPERATING TEMPERATURE—
–20°C to +70°C.
STORAGE TEMPERATURE—
–40°C to +70°C.
HUMIDITY RANGE—
5 to 95% RH (Det-Tronics verified).
SENSOR COMPATIBILITY—
The UD20 can be used with any of the Det-Tronics
GT3000 line of gas detectors, or the Det-Tronics Model
PIRECL hydrocarbon gas detector.
WIRING TERMINALS—
Terminals can handle wire sized from 22 to 14 AWG.
CONDUIT ENTRIES—
3/4” NPT or M25.
(Five conduit entries standard.)
ENCLOSURE MATERIAL—
Epoxy coated aluminum or 316 stainless steel.
SHIPPING WEIGHT—
Aluminum: 4.15 pounds (1.88 kilograms).
Stainless steel: 10.5 pounds (4.76 kilograms).
DIMENSIONS—
See Figures 12 and 13.
ELECTRO-MAGNETIC COMPATIBILITY—
EMC Directive 2004/108/EC
EN55011 (Emissions)
EN50270 (Immunity)
WARRANTY—
12 months from date of installation or 18 months from
date of shipment, whichever occurs first.
Table 4— PIRECL LEDs and 4-20 mA Output
During Various Status Conditions
Function Green
LED
Yellow
LED
Analog
4-20 mA
Signal
Warm-up Off Steady On 3.0
Normal
Operation Steady On Off 4-20
Fault
Condition Off Steady On 3.0
Blocked
Optics Off Steady On 3.0
Calibration See Table 2 3.8

4.1 95-862012
11.28
(28.7)
6.48
(16.5)
3.46
(8.8)
4.7
(11.9)
5.2
(13.2)
R0.175
5.86
(14.9)
A2442
Figure 12—Dimensions of UD20 with GT3000 in Inches (Centimeters)

4.1 95-862013
UD20 CERTIFICATIONS—
FM: Class I, Div. 1, Groups B, C & D;
Class I, Div. 2, Groups B, C & D (T4);
Class I, Zone 1/2 AEx d IIC T6;
Class II/III, Div. 1/2, Groups E, F & G.
Tamb –20°C to +70°C
NEMA/Type 4X, IP66
Conduit seal not required.
Performance verified in accordance with:
ANSI/ISA-92.00.01
FM 6340
ANSI/ISA 60079-29-1
FM 6320
CSA: CSA 08 2162793.
Class I, Div. 1, Groups B, C & D;
(Tamb = –20°C to +70°C).
Class II/III, Div. 1/2, Groups E, F & G;
(Tamb = –20°C to +70°C).
Class I, Div. 2, Groups A, B, C & D (T4);
(Tamb = –40°C to +70°C) with
Bartec Self-Regulating Heating
Cable System. (Install per Figure 9.)
Type 4X, IP66.
Conduit seal not required.
ATEX: 0539
FM
APPROVED
II 2 G
Ex db IIC T6
Tamb –20°C to +70°C
FM08ATEX0044X
IP66
Performance verified in accordance with:
EN 60079-29-1.
IECEx: Ex db IIC T6
Tamb –20°C to +70°C
IECEx FMG 08.0010X
IP66
Performance verified in accordance with:
IEC 60079-29-1.
INMETRO UL-BR 15.0469X
Ex d IIC T6 Gb IP66
T6 (Tamb –20°C to +70°C)
All cable entry devices shall be Brazil certified in the
type of explosion protection, flameproof enclosure “d,”
suitable for the conditions of use and correctly installed,
with an ingress protection rating of IP66.
A screw or cover lock is provided for a secondary
means of fastening the cover.
FM
APPROVED
®
Figure 13—Dimensions of Model STB Termination Box
in Inches (Centimeters)
3.77
(9.6)
1.28
(3.3)
3.46
(8.8)
4.7
(11.9)
2.7
(6.9)
5.2
(13.2)
5.86
(14.9)
C2281
FM
APPROVED

4.1 95-862014
DeVice repAir AnD retUrn
Prior to returning devices, contact the nearest local
Detector Electronics office so that a Return Material
Identification (RMI) number can be assigned. A
written statement describing the malfunction must
accompany the returned device or component to
assist and expedite nding the root cause of the
failure.
Pack the unit properly. Always use sufficient packing
material. Where applicable, use an antistatic bag as
protection from electrostatic discharge.
NOTE
Inadequate packaging that ultimately causes
damage to the returned device during shipment
will result in a service charge to repair the damage
incurred during shipment.
Return all equipment transportation prepaid to the
factory in Minneapolis.
NOTE
It is highly recommended that a complete spare
be kept on hand for eld replacement to ensure
continuous protection.
orDerinG informAtion
Sensor module, Transmitter module, and termination
boxes (if used) must be ordered separately.
Refer to the UD20 Model Matrix for ordering details.
REPLACEMENT PARTS/ACCESSORIES
Part Number Description
009700-001 Magnetic Tool
009793-002 Electronics Module
010253-001 250 ohm Terminating Resistor Kit
101197-001* Stop Plug, 3/4" NPT, AL
101197-004* Stop Plug, 3/4" NPT, SS
101197-005 Stop Plug, M25, AL, IP66
101197-003 Stop Plug, M25, SS, IP66
010816-001 Stop Plug, 20PK, 3/4" NPT, AL, EX D
010817-001 Stop Plug, 20PK, 3/4" NPT, SS, EX D
010818-001 Stop Plug, 20PK, M25, AL, IP66, EXDE
010819-001 Stop Plug, 20PK, M25, SS, IP66, EXDE
104190-001 Stop Plug, M25, AL, INMETRO
104190-002 Stop Plug, 3/4” NPT, AL, INMETRO
104190-003 Stop Plug, M25, SS, INMETRO
104190-004 Stop Plug, 3/4” NPT, SS, INMETRO
102804-001 Reducer, M25 to M20, AL
102804-003 Reducer, M25 to M20, SS
103922-001 475 Field Communicator
005003-001 Lubriplate grease, 1 oz.
107427-040 O-ring - Viton
104371-001 Bartec Self-Regulating Heating
Cable System
*NEMA 4/IP66 rating requires addition of non-hardening
thread sealant or Teflon tape.
MODEL DESCRIPTION
UD20 Universal Display Unit
TYPE MATERIAL
AAluminum
SStainless Steel (316)
TYPE THREAD TYPE
5M 5 PORT, METRIC M25
5N 5 PORT, 3/4” NPT
TYPE OUTPUTS
26 Pass-Through 4-20 mA, HART
TYPE APPROVAL
WFM/CSA/ATEX/IECEx
BINMETRO (Brazil)
TYPE CLASSIFICATION (Div/Zone)
2Ex d (Flameproof)
UD20 MODEL MATRIX

4.1 95-862015
AppenDix A
HART COMMUNICATION – UD20 WITH GT3000
menU strUctUre
This section displays the menu trees for the UD20 connected to the GT3000. The menu tree shows the primary
commands and options available when using menu selections.

4.1 95-862016
MAIN MENU
PROCESS VARS  DISPLAY STATUS  DEVICE STATUS  DISPLAY SETUP  DEVICE SETUP  DEVICE CAL  DEVICE TEST 
PROCESS VARS
GAS NAME XXXX GAS VALUE X.XX ANALOG INPUT XX.XX MA URV X.XX LRV X.XX FAULT Y/N
DEVICE STATUS
GENERAL INFO  FAULT/STATUS  TX INFO  SENSOR INFO  HISTORY  DEBUG MENU 
March 1, 2013
UD20
GT3000
Detector Electronics
1.26
FAULT/STATUS
OP MODE XXXXX CAL STATE XXXXX TX STATUS Y/N TX FAULT Y/N SENSOR STATUS Y/N SENSOR FAULT Y/N
RTC
SECONDS XX MINUTES XX HOURS XX DAY XX MONTH XX YEAR XX
GENERAL INFO
MANUFACTURER  MODEL FGP_TX TAG XXXXX DESCRIPTOR XXXXX DATE DD/MMM/YYYY MESSAGE XXXXX FINAL ASSY NUM XXXXX
DEVICE ID XXXXX
HISTORY
TX HISTORY  SENSOR HISTORY  CALIBRATION LOG  EVENT LOG 
CALIBRATION LOG
CAL ID XXX DATE DD/MMM/YYYY TIME HH:MM:SS
ZERO XX.XX
SPAN XX.XX
EVENT LOG
EVENT XXXXX DATE DD/MMM/YYYY
TIME HH:MM:SS
DEVICE SETUP
HART OPTION  RTC  WRITE PROTECT 
HART OPTION
TAG XXXXX DESCRIPTOR XXXXX DATE DD/MMM/YYYY MESSAGE XXXXX FINAL ASSY NUM XXXX
D/A TRIM
ZERO TRIM GAIN TRIM
RTC
SECONDS XX MINUTES XX HOURS XX DAY XX MONTH XX YEAR XX
DEVICE CAL
CAL GAS CONC XX.XX CALIBRATION  CHANGE SNSR TYPE
DEVICE TEST
SELF TEST RESPONSE TEST LOOP TEST  D/A TRIM 
LOOP TEST
SET 4-20 MA 
SET 4-20 MA
3.5 MA 4 MA 6 MA 8 MA 10 MA 12 MA 14 MA 16 MA 18 MA 20 MA
CALIBRATION
EXECUTE ABORT
TX STATUS
TX FAULT ON/OFF WARM UP ON/OFF CHANGE CONFIG ON/OFF MULTI DROP ON/OFF WRITE PROTECT ON/OFF
SELF TEST ON/OFF RESPONSE TEST ON/OFF CURRENT FIXED ON/OFF LOOP TEST ON/OFF FACTORY MODE ON/OFF SNSR ASSY REMOVE ON/OFF
DEBUG MENU
MODBUS ERRORSXXXX
6901 West 110th Street
Minneapolis, MN 55438 USA
DISPLAY STATUS
DISPLAY INFO  FAULT/STATUS  DEBUG MENU 
DEBUG MENU
HART ERRORS XXXXX LCD TEST ANALOG INPUT XX.XX MA
FAULT/STATUS
OP MODE XXXXX FAULT Y/N STATUS Y/N
DISPLAY INFO
F/W REV XX.XX
SERIAL NUMBER XXXX TEMPERATURE XX.XX C FACTORY CONFIG
FAULT
ADC FAULT ON/OFF ANALOG CODE FLT ON/OFF FLASH FAULT ON/OFF RAM FAULT ON/OFF WDT FAULT ON/OFF 3V FAULT ON/OFF INPUT LOOP FAULT ON/OFF
STATUS
ANY FAULT ON/OFF CAL ACTIVE ON/OFF WARM UP ON/OFF INPUT HART ON/OFF
TX FAULT
EE FAULT ON/OFF
ADC FAULT ON/OFF
DAC FAULT ON/OFF
LOW VOLTAGE ON/OFF
FLASH CRC FAULT ON/OFF RAM FAULT ON/OFF TEMP FAULT ON/OFF
SOFTWARE FAULT ON/OFF
EE SAFETY FAULT ON/OFF ZERO DRIFT FAULT ON/OFF
SENSOR MISMATCH ON/OFF SENSOR FAULT ON/OFF
SENSOR STATUS
SENSOR FAULT ON/OFF WARM UP ON/OFF CAL ACTIVE ON/OFF CAL SWITCH ON/OFF WRITE PROTECT ON/OFF
EOL SENSOR ON/OFF CHANGE CONFIG ON/OFF
SENSOR FAULT
CAL FAULT ON/OFF EE FAULT ON/OFF
ADC FAULT ON/OFF ADC CNTR FAULT ON/OFF 3V FAULT ON/OFF ZERO DRIFT FAULT ON/OFF
FLASH CRC FAULT ON/OFF
RAM FAULT ON/OFF TEMP FAULT ON/OFF
COMM FAULT ON/OFF
TX HISTORY
RUNNING HOURS XXXXX MAX TEMP XX.XX C
MAX TEMP TIME XXXXX MIN TEMP XX.XX C
MIN TEMP TIME XXXXX
SENSOR HISTORY
RUNNING HOURS XXXX MAX TEMP XX.XX C MAX TEMP TIME XXXXX
MIN TEMP XX.XX C MIN TEMP TIME XXXXX
TX INFO
RTC  H/W REV XX.XX F/W REV XX.XX
SERIAL NUMBER XXXXX UNIVERSAL REV XXXXX FLD DEV REV XXXXX RUNNING HOURS XXXXX TEMPERATURE XX.XX C
SENSOR INFO
SENSITIVITY XXX.XX
GAS TYPE XXXXX H/W REV XX.XX F/W REV XX.XX
SERIAL NUMBER XXXXX REV XXXXX USL XX.XX LSL XX.XX RUNNING HOURS XXXXX CAL POINT ZERO XX.XX CAL POINT SPAN XX.XX PPM HOURS XXXXX TEMPERATURE XX.XX C
WRITE PROTECT
CHANGE STATE CHANGE PASSWORD WRITE PROTECT XXXXX
DISPLAY SETUP
CONTRAST CONTROL INPUT LOOP CAL

4.1 95-862017
AppenDix b
HART COMMUNICATION – UD20 WITH PIRECL
menU strUctUre
This section displays the menu trees for the UD20 connected to the PIRECL. The menu tree shows the primary
commands and options available when using menu selections.

4.1 95-862018
MAIN MENU
PROCESS VARS  DISPLAY STATUS  DEVICE STATUS  DISPLAY SETUP  DEVICE SETUP  DEVICE CAL  DEVICE TEST 
PROCESS VARS
GAS NAME XXXX
GAS VALUE X.XX
ANALOG INPUT XX.XX MA
URV X.XX LRV X.XX FAULT Y/N
March 1, 2013
UD20
PIRECL
Detector Electronics
1.26
D/A TRIM
ZERO TRIM GAIN TRIM
DEVICE TEST
SELF TEST RESPONSE TEST LOOP TEST 
D/A TRIM 
LOOP TEST
SET 4-20 MA 
SET 4-20 MA
3.5 MA
4 MA 6 MA 8 MA 10 MA 12 MA 14 MA 16 MA 18 MA 20 MA
DISPLAY STATUS
DISPLAY INFO  FAULT/STATUS  DEBUG MENU 
DEBUG MENU
HART ERRORS XXXXX LCD TEST ANALOG INPUT XX.XX MA
FAULT/STATUS
OP MODE XXXXX
FAULT Y/N STATUS Y/N
DISPLAY INFO
F/W REV XX.XX SERIAL NUMBER XXXX TEMPERATURE XX.XX C
FACTORY CONFIG
FAULT
ADC FAULT ON/OFF ANALOG CODE FLT ON/OFF FLASH FAULT ON/OFF RAM FAULT ON/OFF WDT FAULT ON/OFF
3V FAULT ON/OFF
INPUT LOOP FAULT ON/OFF
STATUS
ANY FAULT ON/OFF CAL ACTIVE ON/OFF WARM UP ON/OFF INPUT HART ON/OFF
SENSOR INFO
ACTIVE XX.XX
REFERENCE XX.XX
RATIO XX.XX
ABSORPTION XX.XX
TEMPERATURE XX.XXC
VOL % XX.XX
USL XX.XX
LSL XX.XX
SPAN FACTOR XX.XX
FAULT/STATUS
OP MODE XXXXX
CAL STATE XXXXX FAULT Y/N STATUS Y/N
GENERAL INFO
MANUFACTURER  MODEL ECLIPSE TAG XXXXX DESCRIPTOR XXXXX DATE DD/MMM/YYYY MESSAGE XXXXX FINAL ASSY NUM XXXXX
DEVICE ID XXXXX
HISTORY
DEVICE HISTORY  CALIBRATION LOG  EVENT LOG 
DEVICE INFO
SERIAL NUMBER XXXXX UNIVERSAL REV XXXXX FLD DEV REV XXXXX S/W REV XXXXX
DEVICE STATUS
GENERAL INFO  FAULT/STATUS  DEVICE INFO  SENSOR INFO  HISTORY 
EVENT LOG
EVENT XXXXX HOURS XXXXX
CALIBRATION LOG
CAL ID XXXXX HOURS XXXXX
STATUS
CAL ACTIVE ON/OFF WARM UP ON/OFF LOW ALARM ON/OFF
HIGH ALARM ON/OFF HART SELF TEST ON/OFF CHANGE CONFIG ON/OFF
FAULT
CAL FAULT ON/OFF DIRTY OPTICS ON/OFF LAMP FAULT ON/OFF START CAL FAULT ON/OFF EE 1 FAULT ON/OFF EE 2 FAULT ON/OFF REF ADC SAT ON/OFF ACTIVE ADC SAT ON/OFF 24V FAULT ON/OFF
12V FAULT ON/OFF
5V FAULT ON/OFF
ZERO DRIFT FAULT ON/OFF
FLASH CRC FAULT ON/OFF RAM FAULT ON/OFF
DEVICE HISTORY
RUNNING HOURS XXXXX MAX TEMP XX.XX C
MAX TEMP TIME XXXX
MIN TEMP XX.XX C
MIN TEMP TIME XXXX
MAX RESET TEMP XX.XX C MAX RESET TIME XXXX
MIN RESET TEMP XX.XX C MIN RESET TIME XXXX
6901 WEST 110TH STREET MINNEAPOLIS, MN 55438 USA
DEVICE SETUP
DEVICE OPTION  ALARM SETTING  HART OPTION  RS485  WRITE PROTECT 
HART OPTION
TAG XXXXX DESCRIPTOR XXXXX DATE DD/MMM/YYYY MESSAGE XXXXX FINAL ASSY NUM XXXXX
DEVICE OPTION
GAS TYPE 
UNIT OF MEASURE  URV XX.XX
LRV XX.XX
USL XX.XX
LSL XX.XX
ANALOG CODE VAL  ANALOG FLT CODE 
RS485
BAUD RATE  PARITY  POLL ADDRESS XXX
BAUD RATE
1200 2400 4800 9600 19.2K
PARITY
NONE EVEN ODD
ALARM SETTING
RST LATCH ALARMS HGH ALARM LEVEL XX.XX
HGH ALARM LATCH Y/N LOW ALARM LEVEL XX.XX
LOW ALARM LATCH Y/N
UNIT OF MEASURE
%LFL PPM VOL%
ANALOG CODE VAL
WARM UP XX.XX
BLOCKED OPTIC XX.XX
CALIBRATION XX.XX
FAULT XX.XX
GAS TYPE
METHANE ETHANE PROPANE ETHYLENE PROPYLENE BUTANE SPECIAL
ANALOG FAULT CODE
ECLIPSE PIR9400 USER DEFINED
WRITE PROTECT
CHANGE STATE CHANGE PASSWORD WRITE PROTECT ENABLED
DEVICE CAL
CAL GAS CONC XX.XX
CAL GAS TYPE  CALIBRATION  CAL DATE DD/MMM/YYYY
CALIBRATION
EXECUTE ABORT
CAL GAS TYPE
SAME AS MEASURE GAS METHANE PROPANE
DISPLAY SETUP
CONTRAST CONTROL INPUT LOOP CAL