L22 / L62 / L42 FM Approved High Limit Controls
from $230 List
Future Design Controls FM Approved L22 DIN Rail Mount, L62 1/16 DIN and L42 1/4 DIN controls provide temperature limit protection in process applications where FM approvals are required. With universal analog inputs, up to two outputs, fast scan rates, remote reset, 3-Year Warranty, user friendly prompts and more make the L-Series L22, L62 & L42 the right choice for safety protection.
FM Approval as a Limit Control:
The L22 / L62 / L42
NFPA National Fire Protection Association 86.8.16.6:
The L22 / L62 / L42 meet the applicable to excess temperature limit controls when used in ovens/furnaces to display both temperature and setpoint values.
UL/cUL Approval:
The L2 / L62 / L42 are UL/cUL listed under Category QUYX (UL) and QUYX7 (cUL)
Analog Input:
The L22 / L62 / L42 offer a full range of universal analog inputs including thermocouple, RTD, mA, VDC & mV.
Control Output(s):
The L22/ L62 / L42 offer mechanical 2A SPST relay and SSRD outputs. Output #1 is the latching Limit alarm with all units offering an optional Output #2 configurable for multiple alarm functions with the L62 & L42 also offering a 3rd alarm output. more information here.
Display Configuration:
The L22/ L62 / L42 offer dual display with the upper display showing Process Variable (PV) with the lower display is configurable to show the SP at all times or SAFE when not in an alarm state; more information here.
Communication Options:
Communication options include Serial Modbus and Linear Retransmission which on all models may be ordered together.
Event Input (EI) Option & Functions:
- Number of Event Inputs: the L22 offers 1 while the L62 & L42 offer 2 Event Inputs.
- Multiple Digital Event Input (EI) functions are available with functional descriptions below.
Power On Logic
The L22 / L62 / L42 offer 3 Power On Configurations with listing below and details below.
- NoRM Normal; alarm active or not based on PV on start up
- RsT Reset Required; regardless of PV on startup Output is Latched
- NOr.L Output is in same state as when powered down
Additional Limit Control Features and descriptions below
Common Specification Review
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L-Series Private Labeling
OEM and Distributor private labeling is available.
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Power On Logic
L22 / L62 / L42 Power on Logic Options
The L22 / L62 / L42 Power On logic may be configured as shown below.
- NoRM (Normal Mode and is system default):
Normal Mode, on power up the Limit output will return to normal operations.
- On Power Down, if the Limit output was latched and on power up not in an alarm state,
the Limit Output will not be latched.
- On Power up if the Limit is in alarm state the Limit Output will Latch.
- RSt (Reset Mode):
Reset Mode, on power up regardless if the process variable (temperature) is not in alarm
state, the Limit output will be latched and must be manually reset by pressing the reset key
on the front panel or by activation of an event input configured for remote reset.
- NoR.L (Normal - Latch)
Normal - Latch, on power up the Limit output will return to normal operations in the same
state as before power was removed unless a limit is exceeded.
- On Power Down if the Limit output was latched, on power up regardless if in alarm
state or not, the Limit output will be latched. If the process variable is not in alarm state,
the Limit output must be manually reset by pressing the reset key on the front panel or
by activation of an event input configured for remote reset.
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L22 / L62 / L42 Display Logic
The L-Series Dual Display allows the operator at all times to view Process Variable (temperature) on the upper display with the lower display configurable to show the following:
- In Alarm Condition: display is configurable to show SAFE or Setpoint value.
- Display in Alarm Condition: the lower display defaults to Setpoint value.
Once the temperature is out of alarm condition the display defaults to its configured setting
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Clearing Latched Alarm Output(s) and Output #2 Description
- Clearing Latched Alarms:
Output #1 is always a Latched Output with Output #2 configurable as described in next
section.
Output #1 is latched when in an alarm state and will remain latched until the process is out
of alarm and the operator depresses the "reset" button on the front panel or via Modbus
communications or the Event Input configured with a Reset function is activated.
- Output #2 may be configured as latching alarm following the same logic as Output #1
(Limit), as a self clearing alarm or with alarm annuciator silence logic. With the alarm
silence logic Output #2 latches on High Limit SP exceedance but may be be cleared by the
Reset Key or Modbus command to silence an external alarm device when the temperature
is still in Alarm State.
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Event Input Functions
The optional Event Input (EI) functions described below are available for each event input.
The L22 offers 1 Event Input while the L62 and L42 offer 2 Event Inputs.
- NoNE The event input will not perform any function when activated.
- LoCK: Selects the remote lock function.
When the event input is activated, it will lock out all parameters and prevent the user from changing them. When the remote lock is activated, the key indicator on the front panel will turn on. When the remote lock is deactivated, the key indicator will turn off. Note: In order for the remote lock function to operate, security must be enabled, i.e., the password parameter (CODE) must be set to a value other than “0”. If the code is equal to “0”, the remote LOCK function will not work. See section 3.1 Security.
- R.RSt: Selects the remote reset function.
When the event input is activated, it will perform the same action as pressing the reset key on the front panel of the limit control.
- H.SP2 Activates high limit set point 2.
The parameter HSP2 will be available under the event input menu providing a second high
limit set point for limit output operation. When the event input is activated, the value set under
the HSP2 parameter will then be used in place of the HSP1 parameter. When the event input
is deactivated, HSP1 will again be used for high limit operation.
- L.SP2 Activates low limit set point 2.
The parameter LSP2 will be available under the event input menu providing a second low
limit set point for limit output operation. When the event input is activated, the value set under
the LSP2 parameter will then be used in place of the LSP1 parameter. When the event input
is deactivated, LSP1 will again be used for high limit operation.
- H.L.S2 Activates high and low limit set point 2.
The parameters HSP2 and LSP2 will be available under the event input menu providing a
second set of high and low limit set points for limit output operation. When the event input is
activated, the values set under the HSP2 and LSP2 parameters will then be used in place of
the HSP1 and LSP1 parameters. When the event input is deactivated, HSP1 and LSP1 will
again be used for high and low limit operation.
- H.SP3 Activates high limit set point 3.
The parameter HSP3 will then become available under the event input menu providing an
additional high limit set point for limit output operation. When the event input is activated, the
value set under the HSP3 parameter will then be used in place of the HSP1 parameter. When
the event input is deactivated, HSP3 will again be used for high limit operation.
- L.SP3 Activates low limit set point 3.
The parameter LSP3 will then become available under the event input menu providing an
additional low limit set point for limit output operation. When the event input is activated, the
value set under the LSP3 parameter will then be used in place of the LSP1 parameter. When
the event input is deactivated, LSP3 will again be used for high limit operation.
- H.L.S3 Activates high and low limit set point 3.
The parameters HSP3 and LSP3 will then become available under the event input menu
providing an additional set of high and low limit set points for limit output operation. When the
event input is activated, the values set under the HSP3 and LSP3 parameters will then be
used in place of the HSP1 and LSP1 parameters. When the event input is deactivated, HSP3
and LSP3 will again be used for high and low limit operation.
- RS.A1 Selects the reset alarm 1 function.
When the event input is activated, it will reset the latched alarm condition on alarm 1 as long
as the alarm condition no longer exists. This does not reset the limit output.
- RS.A2 Selects the reset alarm 2 function.
When the event input is activated, it will reset the latched alarm condition on alarm 2 as long
as the alarm condition no longer exists. This does not reset the limit output.
- RS.A3 Selects the reset alarm 3 function.
When the event input is activated, it will reset the latched alarm condition on alarm 3 as long
as the alarm condition no longer exists. This does not reset the limit output.
- RS.Ao Selects the reset all alarms function.
When the event input is activated, it will reset the latched alarm condition on all alarms as long
as the alarm condition no longer exists. This does not reset the limit output.
- CA.LH Selects the cancel alarm latch function.
When the event input is activated, it will cancel the alarm latch for all alarms as long as the
alarm set point is not exceeded. This does not affect the limit output.
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L22 / L62 / L42 Common Specification Review
- Power Input:
- 90-250VAC 47-63 HZ
- 11-40 VDC / 20-28 VAC (optional)
- Input sample rate - 5 scans/second
- Analog Inputs:
- Universal Analog Input, Thermocouple, RTD, mA, VDC and mV.
- Event Inputs (optional):
The L22 offers
1 with L62 & L42 offering 2 Event Inputs.
- Functions Listed Below with descriptions above
- LoCK: Selects the remote lock function.
- R.RSt Selects the remote reset function.
- H.SP2 Activates high limit set point 2.
- L.SP2 Activates low limit set point 2
- H.L.S2 Activates high and low limit set point 2
- H.SP3 Activates high limit set point 3.
- L.SP3 Activates low limit set point 3.
- H.SP3 Activates high limit set point 3.
- H.L.S3 Activates high and low limit set point 3.
- RS.A1 Selects the reset alarm 1 function
- RS.A2 Selects the reset alarm 2 function.
- RS.A3 Selects the reset alarm 3 function.
- RS.Ao Selects the reset all alarms function.
- CA.LH Selects the cancel alarm latch function
- Limit Control Output #1 - Latching: Configurable as High Alarm, Low Alarm or combination High-Low Alarm Setpoint with one digital output. Available Digital Outputs:
- Relay: 2A/240 VAC resistive [SPST]
- SSR Driver: 5VDC/30mA or 14VDC/40mA
- Output #2 is available with one of the following options: Digital Output [relay, triac or ssr driver] transmitter power supply, communications.
- Digital Outputs are same as output #1
- Transmitter Power Supply [Isolated];
- 20 VDC/25mA
- 12 VDC/40mA
- 5 VDC/80mA
- Output #3 is limited to L62 & L42
- L22: Not available
- L62: Relay 2A form A SPST is mutually exclusive with Communications Retransmission
- L42: Relay 2A form A SPST
- Communications: not mutually exclusive, all may be ordered except for L62 with Output #3
- Digital Event Input (EI): L22 one EI with L62 & L42 two EI
- RS485 Modbus Communication with access to all parameters.
- Retransmission Linear of Process Value (temperature) or Setpoint Value
- Configurable Display when not in alarm condition Setpoint or when not in alarm condition the word SAFE.
- When in Alarm display defaults to SP (setpoint) with output 1 latched closed and front panel Out1 annunciation energized.
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