Omega cl310 User manual

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User’s Guide
M-4590/1107
CL310
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apply. OMEGA is constantly pursuing certification of its products to the European New Approach
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The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING:These products are not designed for use in, and should not be used for, human applications.

1. Introduction
The Omega CL310 Multifunction Process Calibrator is a handheld,
battery-operated instrument that measures and sources electrical
and physical parameters. The calibrator has the following features
and functions:
• A dual display. The upper display is used for the measurement of
volts, current, and pressure. The lower display can be used to
measure volts, current, pressure, resistance temperature detectors
(RTDs), thermocouples, frequency, and resistance, and to source
pulse trains
• A thermocouple (TC) input/output terminal with automatic
reference-junction temperature compensation.
• Five setpoints in each range for increasing/decreasing output
• An interactive menu
• Complete RS232 interface for remote control
• Isolated read back for transmitter calibration.
• Documenting capability for up to 50 tags.
1.1 Customer Service
Omega Engineering
One Omega Drive
Box 4047
Stamford, CT 06907-0047
Tel: [phone]
Fax: [phone]
www.omega.com
email: [email protected]
1.2 Standard Equipment
Check to see if your calibrator is complete. It should include:
CL310 Calibrator, Instruction Manual, Test Leads, Rubber Boot, RS-
232 cable, USB adapter cable, NIST Certificate, software CD.
1.3 Safety information
Symbols Used
The following table lists the International Electrical Symbols. Some or
all of these symbols may be used on the instrument or in this
manual.
1

Symbol Description
AC (Alternating Current)
AC-DC
Battery
CE Complies with European Union Directives
DC
Double Insulated
Electric Shock
Fuse
PE Ground
Hot Surface (Burn Hazard)
Read the User’s Manual (Important Information)
Off
On
The following definitions apply to the terms “Warning” and “Caution”.
• “Warning” identifies conditions and actions that may pose hazards
to the user.
• “Caution” identifies conditions and actions that may damage the
instrument being used.
Use the calibrator only as specified in this manual, otherwise injury
and damage to the calibrator may occur.
2

Warning
To avoid possible electric shock or personal injury:
• Do not apply more than the rated voltage. See specifications for
supported ranges.
• Follow all equipment safety procedures.
• Never touch the probe to a voltage source when the test leads are
plugged into the current terminals.
• Do not use the calibrator if it is damaged. Before you use the
calibrator, inspect the case. Look for cracks or missing plastic. Pay
particular attention to the insulation surrounding the connectors.
• Select the proper function and range for your measurement.
• Make sure the battery cover is closed and latched before you
operate the calibrator.
• Remove test leads from the calibrator before you open the battery
door.
• Inspect the test leads for damaged insulation or exposed metal.
Check test leads continuity. Replace damaged test leads before
you use the calibrator.
• When using the probes, keep your fingers away from the probe
contacts. Keep your fingers behind the finger guards on the
probes.
• Connect the common test lead before you connect the live test
lead. When you disconnect test leads, disconnect the live test lead
first.
• Do not use the calibrator if it operates abnormally. Protection may
be impaired. When in doubt, have the calibrator serviced.
• Do not operate the calibrator around explosive gas, vapor, or dust.
• When using a pressure module, make sure the process pressure
line is shut off and depressurized before you connect it or
disconnect it from the pressure module.
• Disconnect test leads before changing to another measure or
source function.
• When servicing the calibrator, use only specified replacement
parts.
• To avoid false readings, which could lead to possible electric shock
or personal injury, replace the battery as soon as the battery
indicator appears.
• To avoid a violent release of pressure in a pressurized system, shut
off the valve and slowly bleed off the pressure before you attach
the pressure module to the pressure line.
3

Caution
To avoid possible damage to calibrator or to equipment under test:
• Use the proper jacks, function, and range for your measurement or
sourcing application.
• To avoid mechanically damaging the pressure module, never apply
more than 10 ft-lb. of torque between the pressure module fittings, or
between the fittings an the body of the module.
• To avoid damaging the pressure module from overpressure, never
apply pressure above the rated maximum printed on the module.
• To avoid damaging the pressure module from corrosion, use it only
with specified materials. Refer to the pressure module
documentation for material compatibility.
4

2. Calibrator Interface
Figure 1 shows the location of the input and output connections on
the calibrator, while Table 1 describes their use.
Figure 1. Input/Output Terminals
Table 1: Input and Output Terminals
No. Name Description
1, 2 Measure Isolated V, Input terminals for measuring current, voltage,
mA terminals and supplying loop power.
3 TC input/output Terminal for measuring, or simulating thermo-
couples. Accepts miniature polarized thermo-
couple plugs with flat in-line blades spaced 7.9
mm (0.312 in) center to center.
4,5 Source/Measure Terminals for sourcing and measuring voltage,
V,RTD 2W, Hz, frequency, pulse train, and RTDs
6,7 Source/Measure Terminals for sourcing and measuring current,
mA terminals, 3W 4W and performing
RTD measurements with 3-wire or 4-wire
setups.
8 Pressure module Connects calibrator to a pressure module for
connector pressure measurements.
9 Serial port Connects calibrator to a PC for uploading data
or remote control or to a serial printer for print-
ing calibration certificates. 5

Figure 2 shows the location of the keys on the calibrator. Table 2 lists
the functions of each key.
Figure 2. Keypad
Table 2. Key Functions
No. Name Function
1 Function Keys Used to operate the menu bar at the bottom of
F1, F2, F3 the calibrator display. F1 is used for selecting
options in the left box, F2 for the center box,
and F3 for the right box.
2 Home Returns to home menu on the menu bar.
3 Power Turns calibrator on and off.
4 Cursor Control Key Left and right arrow keys are used to select
which decade to be changed in output value.
Up and down arrow keys are used to increase,
decrease, or ramp output value.
5 Numeric Keypad Allows user to enter Numeric values.
6

2.1 Main Display
Figure 3. Display
The display of the calibrator, shown in Figure 3, is divided into three
main sections: the upper display, the lower display, and the menu
bar.
The upper display is used for measuring dc voltage, dc current with
and without loop power, and pressure.
The lower display can be used for both measuring and sourcing.
The menu bar is used to setup both the upper and the lower display
to perform the desired function.
Table 3 explains the different parts of the display:
Table 3: Display Functions
No. Name Description
1 Primary Parameters Determine what parameter is going to be meas-
ured or sourced. The available options for the
upper display are:VOLTS IN, PRESSURE, mA
IN, and mA LOOP. The available options for the
lower display are:VOLTS, TC (thermocouple),
RTD, FREQ (frequency), PULSE, PRESSURE,
mA, and mA 2W SIM.
2 Input/Output control Switches the lower display between input mode
(read), and output mode (source).
3 Additional Settings Available only for TC (thermocouple), and RTD
measurements. For TC this setting turns the
CJC (Cold Junction Connection) on and off. For
RTD measure [RTD IN], this setting sets the
number of wires used in the measurement (2-
wire, 3-wire, or 4-wire)
4 Span Indicator Available only for mA and mA LOOP. Shows
where in the preset span the measured value
falls. Fixed for mA at 4 (0%) and 20 (100%).
7

5 Units Shows what unit the measurement or source
value is in. Available options are for RTD and
TC (°C or °F), and for FREQ and PULSE (CPM,
Hz, or KHz)
6 Sensor Types Allow for measurements to be made for different
types of RTDs and TCs. All types are shown in
the Specifications. Also, displays the amplitude
of the pulse and frequency source, and pres-
sure units.
7 Numeric Displays Display the numeric values of the signal being
measured, or sourced. An "OL" reading indi-
cates an out of range or overload condition.
2.2 Menu Bar
The parameters on the display are controlled by the menu bar, which
is located at the bottom of the LCD. The function keys (F1, F2, and
F3) are used to navigate through all the levels and choices of the
menu bar. Refer to the menu tree for a clarification on the layout of all
the levels.
The top level of the menu is the home menu. It can be accessed
anytime by pressing the HOME key. There are three variations of the
home menu: the input home menu, the output home menu, and the
pulse home menu.
In the input home menu the only active options are [MENU] and
[LIGHT]. The [MENU] option is used to enter the next level of the
menu bar, the main menu. Press the corresponding function key (F1)
to enter the main menu. The [LIGHT] option is used to turn on the
LCD back light. Press the corresponding function key (F2) to turn on
the back light.
In the output home menu there are three active options, [MENU],
[LIGHT] and [STEP] or [RAMP]. The first two options work the same
as in the input home menu. The third option is selectable in the Auto
Function Menu and is used to turn on and off the selected auto
function. See Section 4.2, Using the Automatic Output Functions.
Also leaving this menu or pressing the Home button will stop the
auto functions.
The pulse home menu also has three active options, [MENU],
[TRIG], and [COUNTS]. The [TRIG] and [COUNTS] options are used
8

for pulse simulation. The function of these options is explained in
Section 4.2-6 (Sourcing a Pulse).
The next level of the menu bar is the main menu. The levels under
the main menu depend on what mode the calibrator is in.
The main menu has three active options [UPPER], [LOWER], and
[MORE].
Choosing [UPPER] calls up the parameter selection menu for the
upper display. Choosing [LOWER] calls up the parameter selection
menu for the lower display. [MORE] enters the next menu level.
The Document Mode selection menu is next. Its options are
[DOCUMENT], [NEXT], and [DONE]. Choosing [DOCUMENT]
enters the document mode menu system described in section 8 of
this manual, [NEXT] proceeds to the next menu level, and [DONE]
returns to the home menu.
The Auto Function Menu is the next menu if you are in source mode.
Its options are [AUTO FUNC], [NEXT] and [DONE]. [AUTO FUNC]
allows you to adjust the Automatic Output Function parameters.
[NEXT] proceeds to the next menu level and [DONE] returns to the
home menu. See Section 4.2,Using the Automatic Output Functions.
The contrast menu is usually the next menu level. Its options are
[CONTRAST], [NEXT], and [DONE]. The [CONTRAST] option is
used to adjust contrast. [NEXT] proceeds to the auto off main menu,
and [DONE] returns to home menu. Contrast is adjusted using the
arrow options, which are available after choosing [CONTRAST].
NOTE: The CL310 calibrator offers a wide range contrast adjustment
feature to accommodate operation in extreme temperatures.
In certain cases making large changes in contrast may render the
display difficult to read under normal conditions. If this occurs and
the display is too dim or dark to read, proceed with the following 9

process to set the contrast back to a default setting.
1. Turn on the unit while holding down the "HOME" key.
2. Hold the key down for a count of 10 seconds to restore contrast
default settings.
If the display is so dim that you cannot tell if the unit is on or off, use
the backlight key to determine if the power is on or off.
The auto off main menu contains the options [AUTO OFF], [NEXT],
and [DONE].
The [AUTO OFF] option is used to turn the automatic shutoff on and
off, and to set the amount of time the unit needs to stay dormant
before it shuts off. [NEXT] proceeds to the clock menu, and [DONE]
returns to the home menu.
The Clock menu is the next menu displayed in the [MORE] menu
sequence. Its options are [CLOCK], [NEXT], and [DONE]. Choose
[CLOCK] to set the calibrator date and time as described in section 8
of this manual, [NEXT] to proceed to the terminal emulation menu,
and [DONE] to return to the home menu.
The Terminal menu is the last menu displayed after choosing
[MORE] in the main menu. Its options are [TERMINAL], [NEXT], and
[DONE]. Choose [TERMINAL] to enter terminal emulation mode.
Select [NEXT] or [DONE] to return to the home menu.
When the lower display is in the frequency or pulse mode, the
frequency level menu is added after the main menu. The options
available in this menu are [FREQ LEVEL], [NEXT], and [DONE]. The
[FREQ LEVEL] option is used to adjust the amplitude of the wave.
[NEXT] is used to access the contrast main menu, and [DONE]
returns to the home menu.
When the calibrator is in RTD CUSTOM mode, the RTD custom
setup menu, is inserted after the main menu. Options [SET
CUSTOM], [NEXT], and [DONE] are available. [SET CUSTOM] is
used to enter a custom PRT into the calibrator. Refer to Section 4.1-
10

8a for instructions. [NEXT] is used to enter the contrast main menu,
and [DONE] to return to the home menu.
The pressure zeroing main menu is the final variation to choosing
[MORE] in the main menu. It has the options [ZERO ], used to zero
pressure, [NEXT] and [DONE], which have the same function as
above. Refer to the Section 5.3 for instructions on zeroing.
The parameter selection menu is called up when [UPPER] or
[LOWER] is selected from the main menu. It contains the following
options: [SELECT], [NEXT], and [DONE]. When the display is
selected, a parameter will start to flash. Use the [SELECT] option to
change the parameter, and the [NEXT] option to switch to another
variable. [DONE] returns to the home menu and enables the
selected mode.
2.3 Cursor control / Setpoint control
The output value can be controlled by the four cursor control arrows
on the keypad. By pressing one of the arrows a cursor will be added
to the display under the last digit of the output value. The left and
right arrow keys are used to select which decade to be changed in
the output value. The up and down arrow keys are used to increase,
decrease, or ramp the output value.
The menu bar will change to the setpoint menu with the touch of any
one of the four arrow keys.
The three function keys are associated with 0, 25, and 100% values,
respectively. 0 and 100% values can be stored by entering a value
and then holding down the corresponding function key. The 25% key
will then automatically step through the 25% values.
11

Figure 4. The Menu Tree
12
Home Menu
MENU
LIGHT
RAMP
Selection Menu
UPPER
LOWER
MORE
Parameter Selection
SELECT
NEXT
DONE
Home Menu
Document Mode Selection
DOCUMENT
NEXT
DONE
Document Menus
Source Mode?
Yes
Frequency Out
or Pulse mode?
Frequency Level Menu
FREQ LEVEL
NEXT
DONE
Yes
No
No
Auto Function Menu
AUTO FUNC
NEXT
DONE
RTD Custom
mode?
Yes
No
RTD Custom Menu
SET CUSTOM
NEXT
DONE
Either display in
Pressure mode?
No
Yes
Pressure Zero Menu
ZERO
NEXT
DONE
Contrast Menu
CONTRAST
NEXT
DONE
Auto Off Menu
AUTO OFF
NEXT
DONE
Clock Menu
CLOCK
NEXT
DONE
Terminal Menu
TERMINAL
NEXT
DONE
Home Menu

3. Using Measure Modes (Lower Display)
3.1 Measuring volts and frequency
Electrical parameters volts and frequency can be measured using
the lower display. To make the desired measurements, follow these
steps:
1. Switch to the lower display [LOWER] from Main Menu.
2. Select the desired parameter for measurement.
3. Connect leads as shown in Figure 5.
Figure 5.
Measuring Volts and Frequency with Input/Output Terminals
3.2 Measuring mA
To measure mA follow these steps:
1. Switch to lower display and select mA.
2. Make sure the input/output control is set to IN.
3. Connect leads as shown in Figure 6.
Figure 6. Measuring mA with Input/Output Terminals
3.3 Measuring Temperature
3.3-1 Using Thermocouples
The calibrator supports the following thermocouple types: B, C, E, J,
K, L, N, R, S, T, U, BP, and XK. The characteristics of all the types are
described in Specifications section. The calibrator also has a Cold
Junction Compensation (CJC) function. Normally this function should
13

be ON and the actual temperature of
the thermocouple will be measured.
With CJC OFF, the calibrator will
measure the difference between the
thermocouple at the junction and at its
TC input terminal.
Note: CJC off mode should only be
used when calibration is being done
using an external ice bath.
To use the thermocouple to measure temperature, follow these
steps:
1. Attach the thermocouple leads to the TC miniplug, and insert the
plug into the input/output of the calibrator, as in Figure 7.
Note: For best accuracy wait 2 to 5 minutes for the temperature
between the miniplug and the calibrator to stabilize before any
measurements are taken.
2. Switch to lower display from Main Menu.
3. Select TC from the primary parameters. Choose [IN] in the
input/output control, and than the thermocouple type from the
sensor types. The temperature unit may also be changed from
Celsius to Fahrenheit.
The calibrator can also measure the mV of a Thermocouple, which
can be used along with a table in case the corresponding TC type is
not supported by the calibrator. To do so, proceed as above and
choose mV from sensor types.
Figure 7. Measuring Temperature Using Thermocouple Terminals
3.3-2 Using Resistance-Temperature-Detectors (RTDs)
The supported types of RTDs are shown in Section 10.
Specifications. RTDs are characterized by their 0°C resistance, R0.
The calibrator accepts two, three, and four wire inputs, with four wire
input being the most accurate.
To use the RTD option, apply the following steps:
1. Switch to lower display [LOWER] from Main Menu.
2. Select RTD from the primary parameters. Select [IN] from
input/output control.
14
Note: The TC wire
used must match the
thermocouple type
being calibrated.

3. Choose 2, 3, or 4-wire connection [2W, 3W, 4W]. (4-wire
allows for the most precise measurement)
4. Select RTD type from the sensor types.
5. Attach RTD leads as shown in Figure 8.
Figure 8. Measuring Temperature with RTD Connection
Resistance can also be measured using this function. To do so,
use the above procedure and choose OHMS from the sensor
types. This option can be used along with a table to measure an
RTD which is not programmed into the calibrator.
3.4 Measuring Pressure
Note: The CL310 is compatible with OMEGA Pressure Modules. The
accessory PCL-PMA is required for pressure measurement.
Note: Pressure is not read from modules with frequency or pulse
train mode enabled.
Note: On high pressure modules engineering units normally
associated with low pressure ranges such as, inH2O, cmH2O, etc. are
not valid selections. Selecting one of these units with a high
pressure module attached will cause the display to read "----".
Warning!
To avoid a violent release of pressure in a pressurized system, shut
off the valve and slowly bleed off the pressure before you attach the
pressure module to the pressure line.
15

Caution
To avoid mechanically damaging the pressure module, never apply
more than 10 ft-lb. of torque between the pressure module fittings, or
between the fittings an the body of the module.
To avoid damaging the pressure module from overpressure, never
apply pressure above the rated maximum printed on the module.
To avoid damaging the pressure module from corrosion, use it only
with specified materials. Refer to the pressure module
documentation for material compatibility.
To measure pressure, follow these steps:
1. Connect the pressure module to the calibrator as shown in
Figure 9.
The calibrator can measure pressure on both the upper and the
lower display. This makes it possible to measure pressure in two
different units at the same time.
2. Switch to either upper or lower display from the Main Menu.
3. Select [PRESSURE] from the primary parameters.
4. Select the desired measuring unit.
5. Zero the pressure module. The zero function on the calibrator
can be found in the pressure zeroing menu.
Figure 9. Connections for Measuring Pressure
3.4-1 Zeroing with Absolute Pressure Modules.
To zero, adjust the calibrator to read a known pressure, such as
barometric pressure.
To adjust the calibrator, follow these steps:
1. Enter the pressure zeroing menu.
16