Cole-Parmer 93284 Instruction Manual
Universal Input Model 93284
Instruction Manual
• Accepts Current, Voltage, TC, & RTD Inputs
• 4 Digit Display, 0.56" (14 mm) High, Red LEDs
• Linear or Square Root with Low-Flow Cutoff
• Maximum/Minimum Display
• UL Type 4X, NEMA 4X, IP65 Front
• Universal Power Supply 85-265 VAC
• 12-36 VDC/12-24 VAC Power Option
• Two Relays or 4-20 mA Output Option
• 24 VDC Transmitter Power Supply Options
• Serial Communication Adapters
RS-232 & RS-422/485 Options
• Modbus
• Copy Meter Settings to Other Meters
• MeterView® Software - Configuration & Data Acquisition
®
RTU Option
Cole-Parmer Instrument Company
625 E. Bunker Hill Court, Vernon Hills, IL 60061
Tel (847) 549-7600 • Fax (847) 247-2929
www.coleparmer.com
Sunlight
Readable
Display!
R
Model 93284 Universal Input Meter Instruction Manual
Disclaimer
The information contained in this document is subject to change
without notice. Cole-Parmer Instrument Company makes no representations or warranties with respect to the contents hereof, and
specifically disclaims any implied warranties of merchantability or fitness for a particular purpose.
Visit our Web Site
http://www.coleparmer.com
2
Model 93284 Universal Input Meter Instruction Manual
INTRODUCTION
The 93284 is a multipurpose, easy to use digital panel meter. It accepts
current, voltage, thermocouple, and RTD signals. The four front panel
buttons make the setup and programming an easy task.
The isolated 24 VDC transmitter power (optional) can be used to power
the input transmitter, the 4-20 mA output, or other devices.
The two relays (optional) can be used for alarm indication or process control applications, such as pump alternation control.
The 4-20 mA isolated output and the Modbus RTU serial communication
options make the 93284 an excellent addition to any system.
ORDERING INFORMATION
Model Description
93284-00 85-265 VAC, No options
93284-02 85-265 VAC, 24 V transmitter supply
93284-04 85-265 VAC, 2 relays
93284-06 85-265 VAC, 2 relays & 24 V transmitter supply
93284-10 12-36 VDC, No options
93284-12 12-36 VDC, 2 relays
93284-30 85-265 VAC, Modbus
93284-32 85-265 VAC, 24 V transmitter supply, Modbus
93284-34 85-265 VAC, 2 relays, Modbus
93284-36 85-265 VAC, 2 relays & 24 V transmitter supply, Modbus
93284-38 85-265 VAC, 4-20 mA output
93284-40 85-265 VAC, 4-20 mA output, Modbus
93284-42 85-265 VAC, 4-20 mA output & 24 V supply
93284-44 85-265 VAC, 4-20 mA output & 24 V supply, Modbus
93284-46 85-265 VAC, 4-20 mA output & dual 24 V supplies
93284-48 85-265 VAC, 4-20 mA output & dual 24 V supplies, Modbus
93284-50 12-36 VDC, Modbus
93284-52 12-36 VDC, 2 relays, Modbus
93284-54 12-36 VDC, 4-20 mA output
93284-56 12-36 VDC, 4-20 mA output, Modbus
Note: All models may be powered from AC or DC, see Specifications for details.
Accessories
Model Description
93284-20 RS-232 Serial Adapter with 93284-24 Included
93284-22 RS-422/485 Serial Adapter with 93284-24 Included
93284-24 Standard Modular Cable, 7' (2.1 m)
93284-26 MeterView® software for 1 meter
93284-27 MeterView® software for up to 10 meters
93284-28 MeterView® software for up to 100 meters
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Model 93284 Universal Input Meter Instruction Manual
Table of Contents
INTRODUCTION ------------------------------------------------------------ 3
ORDERING INFORMATION--------------------------------------------- 3
SPECIFICATIONS---------------------------------------------------------- 7
General-------------------------------------------------------------------------------7
Process Input ----------------------------------------------------------------------8
Temperature Inputs -------------------------------------------------------------- 9
Relays Option-------------------------------------------------------------------- 10
Isolated 4-20 mA Transmitter Output ------------------------------------ 11
Serial Communications------------------------------------------------------- 11
COMPLIANCE INFORMATION ----------------------------------------12
Safety ------------------------------------------------------------------------------- 12
Electromagnetic Compatibility--------------------------------------------- 12
SAFETY INFORMATION ------------------------------------------------13
INSTALLATION ------------------------------------------------------------14
Unpacking------------------------------------------------------------------------- 14
Panel Mounting------------------------------------------------------------------ 14
Connections---------------------------------------------------------------------- 15
Connector Labeling ---------------------------------------------------------- 15
Power Connections ---------------------------------------------------------- 15
Signal Connections ---------------------------------------------------------- 16
Serial Communication ------------------------------------------------------- 19
Relays and 24 V Output Connections ----------------------------------- 19
Switching Inductive Loads-------------------------------------------------- 20
4-20 mA Output & Input Signal Connections -------------------------- 21
SETUP AND PROGRAMMING ----------------------------------------22
Front Panel Buttons and Status LED Indicators --------------------- 23
Display Functions and Messages----------------------------------------- 24
Main Menu ------------------------------------------------------------------------ 27
Setting Numeric Values ------------------------------------------------------ 28
Setting Up the Meter (setu) ------------------------------------------------- 29
Setting the Input Signal (inpt) -------------------------------------------- 30
Setting the Decimal Point (dc.pt) ----------------------------------------- 31
Setting the Temperature Scale (F C) ---------------------------------- 31
Setting the Relay Operation (rely) -------------------------------------- 32
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Model 93284 Universal Input Meter Instruction Manual
Relay and Alarm Operation ------------------------------------------------ 35
Scaling the 4-20 mA Analog Output (Aout) ---------------------------- 41
Program the Sensor Break Output Value (SEbr) --------------------- 42
Analog Output when Display is Out of Range------------------------- 42
Programming the Meter (prog)--------------------------------------------- 43
Scaling the Meter (scal)---------------------------------------------------- 44
Calibrating the Meter (Cal)------------------------------------------------- 46
Recalibrating Temperature Inputs (Cal) -------------------------------- 46
Recalibrating Process Inputs (ICal)------------------------------------- 47
Setting Up the Password (pass) ------------------------------------------- 48
Locking the Meter ------------------------------------------------------------ 48
Unlocking the Meter---------------------------------------------------------- 48
Advanced Features Menu---------------------------------------------------- 50
Advanced Features Menu & Display Messages ---------------------- 51
Offset Adjustment (Adj)----------------------------------------------------- 53
Noise Filter (fltr)------------------------------------------------------------ 53
Noise Filter Bypass (byps) ------------------------------------------------- 54
Serial Communications (serl) -------------------------------------------- 54
Select Menu (SElc) ---------------------------------------------------------- 55
Linear or Square Root Function (linr or Sqrt) ---------------------- 55
Low-Flow Cutoff (cutF) ----------------------------------------------------- 56
Display Intensity (inty) ----------------------------------------------------- 56
Meter Copy Function (Copy) ----------------------------------------------- 57
Internal Calibration (ICal)-------------------------------------------------- 59
OPERATION ----------------------------------------------------------------62
Front Panel Buttons Operation -------------------------------------------- 62
Maximum/Minimum Readings---------------------------------------------- 63
MOUNTING DIMENSIONS----------------------------------------------64
TROUBLESHOOTING----------------------------------------------------65
Diagnostics Menu (diag)----------------------------------------------------- 65
Determining Software Version -------------------------------------------- 65
Reset Meter to Factory Defaults ------------------------------------------- 66
Factory Defaults & User Settings----------------------------------------- 67
Troubleshooting Tips --------------------------------------------------------- 69
QUICK USER INTERFACE REFERENCE GUIDE----------------70
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Model 93284 Universal Input Meter Instruction Manual
Table of Figures
Figure 1. Panel Cutout and Mounting............................................... 14
Figure 2. Connector Labeling for Two Relays & 24 V Supply.........15
Figure 3. Power Connections ............................................................ 15
Figure 4. Transmitter Powered by Ext. Supply or Self-Powered.... 16
Figure 5. Transmitters Powered by Internal Supply (Optional)...... 16
Figure 6. Voltage Input Connections................................................ 17
Figure 7. Thermocouple Input Connections .................................... 17
Figure 8. Three-Wire RTD Input Connections .................................. 18
Figure 9. Two-Wire RTD Input Connections..................................... 18
Figure 10. Four-Wire RTD Input Connections.................................. 19
Figure 11. Relay & 24 V Output Connections................................... 19
Figure 12. AC and DC Loads Protection...........................................20
Figure 13. Low Voltage DC Loads Protection .................................. 20
Figure 14. 4-20 mA Output & Input Signal Powered by Meter ........21
Figure 15. 4-20 mA Output Powered Externally............................... 21
Figure 16. Meter Copy Connection ................................................... 57
Figure 17. Meter Dimensions – Side View........................................ 64
Figure 18. Case Dimensions - Top View........................................... 64
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Model 93284 Universal Input Meter Instruction Manual
SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
General
DISPLAY 0.56" (14 mm) high, red LED
DISPLAY INTENSITY Eight intensity levels
DISPLAY
UPDATE RATE
OVERRANGE
UNDERRANGE
PROGRAMMING
METHODS
NOISE FILTER Programmable from 2 to 199 (0 will disable filter)
RECALIBRATION All ranges are calibrated at the factory. Recalibration is
MAX/MIN
DISPLAY
PASSWORD Programmable password restricts modification of
NON-VOLATILE
MEMORY
POWER AC: 85-265 VAC, 50/60 Hz, DC: 90-265 VDC
FUSE Required fuse: UL Recognized, 5 A max, slow blow
ISOLATED
TRANSMITTER
POWER SUPPLY
NORMAL MODE
REJECTION
ISOLATION 4 kV input/output-to-power line
OVERVOLTAGE
CATEGORY
Four digits (-1999 to 9999), automatic lead zero blanking.
Process/RTD: 3.7-5/second
Thermocouple: 1.8-2.5/second
Display flashes
Display flashes
Four front panel buttons, PC and MeterView® software, or
cloning using Copy function
recommended at least every 12 months.
Max/min readings reached by the process are stored until
reset by the user or until power to the meter is turned off.
programmed settings.
All programmed settings are stored in non-volatile memory
for a minimum of ten years if power is lost.
Models with transmitter option: 20 VA / 20 Watts
Models without transmitter option: 8 VA / 8 Watts
Optional: 12-36 VDC, 12-24 VAC, 6 Watts / 6 VA
Up to 6 meters may share one 5 A fuse
One or two transmitter power supplies (Optional)
P or P1: 24 VDC ± 10% @ 200 mA max. (-1 option)
P1 & P2: 24 VDC ± 10% @ 200 mA & 40 mA max. (-2 option)
64 dB at 50/60 Hz
500 V input-to-output, output-to-P1/P2, or P1-to-P2 supplies
Installation Overvoltage Category II:
Local level with smaller transient overvoltages than Installation Overvoltage Category III.
9999
-1999
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Model 93284 Universal Input Meter Instruction Manual
ENVIRONMENTAL Operating temperature range: 0 to +65°C
CONNECTIONS Removable screw terminal blocks accept 12 to 26 AWG
ENCLOSURE 1/8 DIN, high impact plastic,
MOUNTING 1/8 DIN panel cutout required. Two panel mounting
TIGHTENING
TORQUE
OVERALL
DIMENSIONS
WEIGHT 8.0 oz (227 g) (no options)
WARRANTY 3 years parts and labor
Storage temperature range: -40 to +85°C
Relative humidity: 0 to 90% non-condensing
wire, RJ11 for serial communication adapters
UL 94V-0, color: gray
bracket assemblies provided
Screw terminal connectors: 4.5 lb-in (0.5 Nm)
2.45" x 4.68" x 4.19" (62 mm x 119 mm x 106 mm)
(H x W x D)
9.7 oz (275 g) (2 relays & 24 V transmitter supply options)
Process Input
INPUTS Field selectable:
ACCURACY ±0.05% of span ±1 count, square root: 10-100% F.S.
FUNCTION Linear or square root
LOW-FLOW
CUTOFF
TEMPERATURE
DRIFT
DECIMAL POINT Up to three decimal places for process inputs:
±20 mADC (0-20, 4-20 mA) and ±10 VDC (0-5, 1-5, 0-10 V)
0-9999 (0 disables cutoff function)
50 PPM/°C from 0 to 65°C ambient
d.ddd, dd.dd, ddd.d, or dddd
CALIBRATION
RANGE
INPUT
IMPEDANCE
INPUT
OVERLOAD
An Error message will appear if input 1 signal and input 2
signals are too close together.
Input
Range
4-20 mA 0.40 mA
±10 V
Voltage ranges: greater than 1 MΩ
Current ranges: 50 - 100 Ω
Current input protected by resettable fuse.
Fuse resets automatically after fault is removed.
Minimum Span
Input 1 & Input 2
0.20 V
(depending on resettable fuse impedance)
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Model 93284 Universal Input Meter Instruction Manual
Temperature Inputs
INPUTS Field selectable: type J, K, T, or E thermocouples;
RESOLUTION
ACCURACY
Input Type Range Accuracy
Type J
Type K
Type T
Type T
0.1° Res
Type E
100 Ω RTD
COLD
JUNCTION
REFERENCE
TEMPERATURE
DRIFT
OFFSET
ADJUSTMENT
INPUT
IMPEDANCE
SENSOR BREAK
DETECTION
100 Ω platinum RTD (0.00385 or 0.00392 curve)
1° for all thermocouples and RTD inputs
1° or 0.1° for Type T thermocouple
-58° to 1382° F
-50° to 750°C
-58° to 2300° F
-50° to 1260°C
-292° to 700° F
-180° to 371°C
-199.9° to 700.0° F
-180.0° to 371.0°C
-58° to 1700° F
-50° to 927°C
-328° to 1382°F
-200° to 750°C
Automatic, fixed, no user calibration needed
±2°C maximum
0 to 65°C ambient temperature
Programmable to ±19.9°. This parameter allows the user to
apply an offset value to the temperature being displayed.
Greater than 100 kΩ
Open TC or RTD sensor indicated by display flashing oPEn.
All relays and alarm status LEDs go to alarm state.
Analog output goes to the programmed sensor break value.
±2°F
±1°C
±2°F
±1°C
±2°F
±1°C
±1.8°F
±1.0°C
±2°F
±1°C
±1°F
±1°C
9
Model 93284 Universal Input Meter Instruction Manual
Relays Option
RATING 2 SPDT (Form C); rated 3 A @ 30 VDC or 3 A @ 250 VAC
ELECTRICAL
NOISE
SUPPRESSION
DEADBAND 0-100% of full scale, user selectable
HIGH OR LOW
ALARM
RELAY
OPERATION
RELAY RESET User selectable via front panel buttons or PC
Automatic reset only (non-latching)
TIME DELAY 0 to 199 seconds, on and off delays
FAIL-SAFE
OPERATION
AUTO
INITIALIZATION
resistive load; 1/14 HP @ 125/250 VAC for inductive loads
A suppressor (snubber) should be connected to each relay
contact switching inductive loads to prevent
disruption to the microprocessor’s operation.
Recommended suppressor value: 0.01 µF/470 Ω, 250 VAC
User may program any alarm for high or low trip point.
Automatic (non-latching)
Latching
Pump alternation control
Automatic + manual reset at any time (non-latching)
Manual reset only, at any time (latching)
Manual reset only after alarm condition has cleared (latching)
Automatic reset: Relays will automatically reset when the
input passes the reset point.
Manual reset: Front panel ACK button. Pressing ACK resets all manually resettable relays.
Programmable and independent for each relay
Programmable
Independent for each relay
When power is applied to the meter, relays will reflect the
state of the input to the meter.
Fail-safe operation: relay coil is energized in non-alarm condition. In
case of power failure, relay will go to alarm state.
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Model 93284 Universal Input Meter Instruction Manual
Isolated 4-20 mA Transmitter Output
OUTPUT RANGE 1.00 to 23.00 mA typical
CALIBRATION Factory calibrated for 4-20 mA
SCALING RANGE 0.00 to 23.99 mA for any display range,
ACCURACY ± 0.1% F.S. ± 0.004 mA
TEMPERATURE
DRIFT
ISOLATED
TRANSMITTER
POWER SUPPLY
EXTERNAL LOOP
POWER SUPPLY
OUTPUT LOOP
RESISTANCE
24 VDC
35 VDC (external)
see output range above
50 PPM/°C from 0 to 65°C ambient
Note: Analog output drift is separate from input drift.
One or two transmitter power supplies (Optional)
P1: 24 VDC ± 10% @ 200 mA max. (-1 option)
P1 & P2: 24 VDC ± 10% @ 200 mA & 40 mA max. (-2 option)
35 VDC maximum
Power supply Minimum Maximum
10 Ω 700 Ω
100 Ω 1200 Ω
Serial Communications
METER
ADDRESS
BAUD RATE 300 – 19,200 bps
TRANSMIT
TIME DELAY
DATA 8 bit (1 start bit, 1 stop bit)
PARITY None, even, or odd
BYTE-TO-BYTE
TIMEOUT
TURN AROUND
DELAY
Refer to PDC and Modbus Serial Communication Protocol manuals for details.
PDC protocol: 0 - 99
Modbus protocol: 1 - 247
Programmable between 0 and 199 ms
or transmitter always on for RS-422 communication
(Modbus only; PDC protocol does not use parity)
0.01 – 2.54 sec (Modbus only)
Less than 2 ms (fixed)
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Model 93284 Universal Input Meter Instruction Manual
COMPLIANCE INFORMATION
Safety
UL LISTED USA and Canada
UL FILE NUMBER E195350
FRONT PANEL UL Type 4X, NEMA 4X, IP65; panel gasket provided
LOW VOLTAGE
DIRECTIVE
Electromagnetic Compatibility
EMISSIONS
Radiated
Emissions
AC Mains
Conducted
Emissions
IMMUNITY
RFI - Amplitude
Modulated
Electrical Fast
Transients
Electrostatic
Discharge
RFI - Conducted
AC Surge
Surge
Power-Frequency
Magnetic Field
Voltage Dips
Voltage
Interruptions
UL 508 Industrial Control Equipment
EN 61010-1:2001 (UL 61010C-1)
Safety requirements for measurement, control, and
laboratory use
EN 55011:1998
Group 1 Class A ISM emissions requirements
Class A
Class A
EN 61000-6-2:2001
EMC heavy industrial generic immunity standard
80 -1000 MHz 10 V/m 80% AM (1 kHz)
±2kV AC mains, ±1kV other
±4kV contact, ±8kV air
10V, 0.15-80 MHz, 1kHz 80% AM
±2kV Common, ±1kV Differential
1KV (CM)
3 A/m 70%V for 0.5 period
40%V for 5 & 50 periods
<5%V for 250 periods
12
Model 93284 Universal Input Meter Instruction Manual
Note:
Testing was conducted on 93284 Meters installed through the covers of grounded metal enclosures with cable shields grounded at the
point of entry representing installations designed to optimize EMC
performance.
Declaration of Conformity available.
SAFETY INFORMATION
!
CAUTION: Read complete
instructions prior to installation and operation of the
meter.
WARNING
Hazardous voltages exist within enclosure. Installation and service
should be performed only by trained service personnel.
13
WARNING: Risk of
electric shock.
Model 93284 Universal Input Meter Instruction Manual
INSTALLATION
There is no need to remove the meter from its case to complete the installation, wiring, and setup of the meter.
Unpacking
Remove the meter from box. Inspect the packaging and contents for damage. Report damages, if any, to the carrier.
If any part is missing or the meter malfunctions, please contact
your supplier or the factory for assistance.
Panel Mounting
• Prepare a standard 1/8 DIN panel cutout – 3.622" x 1.772" (92 mm
x 45 mm). Refer to Mounting Dimensions, page 64 for more details.
• Clearance: allow at least 4" (102 mm) behind the panel for wiring.
• Panel thickness: 0.04" - 0.25" (1.0 mm - 6.4 mm).
Recommended minimum panel thickness to maintain Type 4X
rating: 0.06" (1.5 mm) steel panel, 0.16" (4.1 mm) plastic panel.
• Remove the two mounting brackets provided with the meter (back-off
the two screws so that there is ¼" (6.4 mm) or less through the
bracket. Slide the bracket toward the front of the case and remove).
• Insert meter into the panel cutout.
• Install mounting brackets and tighten the screws against the panel.
To achieve a proper seal, tighten the mounting bracket screws
evenly until meter is snug to the panel along its short side. DO NOT
OVER TIGHTEN, as the rear of the panel may be damaged.
1.772"
B
(45mm)
A
3.622" (92mm)
Square Corners to 0.060"
(1.5mm) Max Radius
Panel Cutout
to DIN 43700
Gasket
Panel
Removable
Connectors
Tolerances:
A: +0.032 (+0.8mm)
-0.000 (-0.0mm)
B: +0.024 (+0.6mm)
-0.000 (-0.0mm)
Figure 1. Panel Cutout and Mounting
14
Mounting
Bracket
Mounting
Screw
Model 93284 Universal Input Meter Instruction Manual
A
Connections
All connections are made to removable screw terminal connectors
located at the rear of the meter.
Use copper wire with 60°C or 60/75°C insulation for all
line voltage connections. Observe all safety regulations.
!
Electrical wiring should be performed in accordance with
all applicable national, state, and local codes to prevent
damage to the meter and ensure personnel safety.
Connector Labeling
The connectors label, affixed to the meter, shows the location of all connectors available with requested configuration. It also identifies the location of the RTD/TC selector switch.
RELA Y2 RELA Y1
4365 21
COM NONO NC NC COM
RTD
TC
EXC T+V+ mA+ COM
3412 5
RTD
SWI TC H
24V OUT
P+ P-
123 456
TC
PO WER
2121
+
EL1601
-
Figure 2. Connector Labeling for Two Relays & 24 V Supply
Power Connections
Power connections are made to a two-terminal connector labeled
POWER on Figure 2. The meter will operate regardless of DC polarity
connection. The + and - symbols are only a suggested wiring convention.
POWER CONNECTOR
Figure 3. Power Connections
12
+ -
Required External Fuse:
5 A max, Slow Blow
15
C or DC
POWER
Model 93284 Universal Input Meter Instruction Manual
Signal Connections
Signal connections are made to a five-terminal connector labeled
SIGNAL on Figure 2. The COM (common) terminal is the return for all
types of input signals.
Current and Voltage Connections
The following figures show examples for current and voltage connections.
There are no switches or jumpers to set up for current and voltage inputs.
Setup and programming is performed through the front panel buttons.
SIGNAL CONNECTOR
V+ T+
EXC
21 354
COMmA+
SIGNAL CONNECTOR
mA+
V+ T+
EXC
21 354
COM
-+ +-
2-Wire
4-20 mA
Transmitter
External
Power
Supply
2-Wire 4-20 mA
Self-Powered
Transmitter
-+
Figure 4. Transmitter Powered by Ext. Supply or Self-Powered
SIGNAL CONNECTOR
mA+
V+ T+
EXC
21 354
-+
2-Wire
4-20 mA
Transmitter
COM
24V OUT
P+ P-
21
SIGNAL CONNECTOR
mA+
V+ T+
Signal
EXC
21 354
+
-
3-Wire
4-20 mA
Transmitter
COM
24V OUT
P+ P-
21
Figure 5. Transmitters Powered by Internal Supply (Optional)
The current input is protected against current overload by a resettable
fuse. The display may or may not show a fault condition depending on
the nature of the overload.
The fuse limits the current to a safe level when it detects a fault condition, and automatically resets itself when the fault condition is removed.
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Model 93284 Universal Input Meter Instruction Manual
SIGNAL CONNECTOR
V+ T+
EXC
21 354
SIGNAL CONNECTOR
mA+
COMmA+
V+ T+
EXC
21 354
COM
24V OUT
P+ P-
21
+-
Voltage
Signal
Signal
+
-
3-Wire
Voltage
Transducer
Figure 6. Voltage Input Connections
The meter is capable of accepting any voltage from -10 VDC to +10 VDC.
Thermocouple and RTD Connections
The following figures show examples for thermocouple and RTD connections.
The RTD/TC selector switch must be set to the proper position for the
meter to accept the selected temperature input.
The input type is selected using the Setup menu.
Selected thermocouple input must correspond to thermocouple sensor
and wire type used.
SIGNAL CONNECTOR
V+ T+
EXC
21 354
COMmA+
+
-
123 456
RTD TC
Switch
Position
TC
Figure 7. Thermocouple Input Connections
17
Model 93284 Universal Input Meter Instruction Manual
SIGNAL
CONNECTOR
V+ T+
EXC
21 354
COMmA+
123 456
RTD TC
RTD
Sensor
Switch
Position
Figure 8. Three-Wire RTD Input Connections
The meter accepts two, three, or four-wire RTDs. The three-wire RTD
connection has built-in lead wire compensation.
SIGNAL
CONNECTOR
V+ T+
EXC
21 354
Figure 9. Two-Wire RTD Input Connections
Lead wire compensation for two-wire RTDs can be applied using the
Adjust menu. See Offset Adjustment (Adj), page 53.
RTD
Sensor
COMmA+
123 456
RTD TC
Switch
Position
18
Model 93284 Universal Input Meter Instruction Manual
T
SIGNAL CONNECTOR
V+ T+
EXC
21 354
COMmA+
123 456
RTD TC
RTD
Sensor
NC
Switch
Position
Figure 10. Four-Wire RTD Input Connections
The four-wire RTD connection is similar to the three-wire. One of the
leads of a four-wire RTD is not connected, and may be clipped off.
The three-wire connection provides sufficient lead wire compensation to
provide accurate readings even with long leads.
Serial Communication
Serial communication connection is made to an RJ11 connector labeled
SERIAL on Figure 2. Use 93284-20 for RS-232 interfacing.
Use 93284-22 for RS-422/485 interfacing.
Use 3-93284-24 for meter-to-meter interfacing for cloning purposes (i.e.
copying programmed settings from one meter to other meters).
Relays and 24 V Output Connections
Relay connections are made to a six-terminal connector labeled
RELAY1, RELAY2 on Figure 2. The COM (common) terminals of the
relays should not be confused with the COM (common) terminal of the
SIGNAL connector. The 24 VDC output is available at the connector
labeled 24V OUT, next to the relays connector.
RELAY2 RELAY1
4365 21 21
24V OU
COM NONO NC NC COM
P+ P-
Figure 11. Relay & 24 V Output Connections
19
Model 93284 Universal Input Meter Instruction Manual
Switching Inductive Loads
The use of suppressors (snubbers) is strongly recommended when switching
inductive loads to prevent disrupting the microprocessor’s operation. The suppressors also prolong the life of the relay contacts. Suppression can be obtained
with resistor-capacitor (RC) networks assembled by the user or purchased as
complete assemblies. Refer to the following circuits for RC network assembly
and installation:
C
C
R
R
Figure 12. AC and DC Loads Protection
Choose R and C as follows:
R: 0.5 to 1 Ω for each volt across the contacts
C: 0.5 to 1 µF for each amp through closed contacts
Notes:
1. Use capacitors rated for 250 VAC.
2. RC networks may affect load release time of solenoid loads. Check to con-
firm proper operation.
3. Install the RC network at the meter's relay screw terminals. An RC network
may also be installed across the load. Experiment for best results.
Use a diode with a reverse
breakdown voltage two to
three times the circuit voltage and forward current at
least as large as the load
current.
Figure 13. Low Voltage DC Loads Protection
20
Model 93284 Universal Input Meter Instruction Manual
4-20 mA Output & Input Signal Connections
Connections for the 4-20 mA transmitter output are made to the connector terminals labeled “mA OUT, I-, I+”. The 4-20 mA output may be
powered from an internal power supply (optional) or from an external
power supply.
SIGNAL CONNECTOR
mA+
V+ T+
EXC
21 354
COM
mA OUT
I-
6
I+
24V OUT
P1-
45 312
P2+
P2-P1+
-
2-Wire
4-20 mA
Transmitter
+
Remote Display,
Chart Recorder,
etc.
-
+
Figure 14. 4-20 mA Output & Input Signal Powered by Meter
mA OUT
I-
I+
56
External
Power
Supply
-
+
+
Remote Display,
Chart Recorder,
etc.
Figure 15. 4-20 mA Output Powered Externally
-
21
Model 93284 Universal Input Meter Instruction Manual
SETUP AND PROGRAMMING
• There is no need to recalibrate the meter
when first received from the factory.
• The meter is factory calibrated prior to
shipment, for all input types, in milliamps,
volts, and degrees respectively. The calibration equipment is certified to NIST standards.
Overview
There are no jumpers involved in the setup process of the meter. The
RTD/TC selector switch, located between the SIGNAL and SERIAL
connectors, must be set accordingly for the meter to accept RTD or
thermocouple inputs, Figure 2.
Setup and programming is done through the front panel buttons.
After power and signal connections have been completed and verified,
apply power to the meter.
For
Quick User Interface Reference Guide
go to page 70.
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