L Series L91 & L41 FM Approved High Limit Controls
from $210 List
Future Design Controls FM Approved L Series L91 1/16 DIN and L41 1/4 DIN provide temperature limit protection in process applications where FM approvals are required. With universal temperature input, up to two outputs, fast scan rates, remote reset, 3-Year Warranty, user friendly prompts and more make the L Series L91 and L41 the right choice for safety protection.
Although the L91 may be DIN Rail mounted with the DRA accessory, for non-panel mount non-indicating FM Approved High Limit refer to the Series 7L surface or DIN Rail mount high limit; Series 7L.
The L91/L41 meet the NFPA National Fire Protection Association 86.8.16.6 applicable to excess temperature limit controls when used in ovens/furnaces to display both temperature and setpoint values.
The L Series offers a full range of universal thermocouple & RTD inputs with latching output selections for mechanical Relay (form C), SSR Drive or Triac output. Consult the L Series manuals for available linear mA & VDC inputs.
Additional Limit Control Features include an optional 2nd control output configurable as latching, non-latching or alarm silence mode; configurable display decimal point, F/C, input filter factor and more. Click here to learn more about these Limit Control Features.
Optional features such as a second relay output, DC Transmitter power supply, remote reset (standard on L41), linear mA/VDC retransmission or RS485 communications offer maximum flexibility for demanding applications. Click here for more information on retransmission & communication options.
A detailed specification review for both the L91 and L41 is shown in the lower half of this page; click here to jump to their respective areas:
- L91 Specification Review
- L41 Specification Review.
L Series Display Logic and Clearing Latched Alarm Output(s)
L91 Display Logic
The L91 single display, regardless of alarm condition and configured display logic the scroll key allows the operator to easily view the current temperature, Output #1 high and if so configured low setpoints and Output #2 setpoint (optional).
- non-alarm condition: display is configurable to show current temperature,
Output #1 high or low limit setpoint or the word SAFE.
- alarm condition: the display shows the current temperature. Once the temperature is out of
alarm condition the display defaults to its configured setting with output(s) remaining latched
until the operator depresses the "reset" button or the optional "remote reset" digital input is
enabled. The optional modbus serial communication also allows the latched relays to be
cleared via comms once the temperature is out of alarm condition.
L41 Display Logic
The L41 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:
- non-alarm condition: display is configurable to show SAFE or Setpoint value.
- alarm condition: the lower display defaults to Setpoint value. Once the temperature is out of
alarm condition the display defaults to its configured setting with output(s) remaining latched
until the operator depresses the "reset" button or the standard "remote reset" digital input is
enabled. The optional modbus serial communication also allows the latched relays to be
cleared via comms once the temperature is out of alarm condition.
For more information - Limit Control Features.
Panel, DIN Rail Mount and Surface Mounting
Panel Mounting
The L91 and L41 may be panel mounted in cutouts meeting 1/16 and 1/4 DIN specifications.
DIN Rail Mount and Surface Mounting
The DRA-16 Panel Mount Adapter allows the L91 and virtually any other 1/16 DIN to be surface or DIN Rail mounted.
for non-panel mount non-indicating FM Approved High Limit refer to the Series 7L surface or DIN Rail mount high limit; Series 7L.
L Series Private Labeling
OEM and Distributor private labeling is available.
FREE EnVision PC Based SCADA Software
EnVision, a FREE PC based SCADA software offers unrivaled flexibility for remote SCADA access to up to a mix of 128 devices including loop controls, 8-channel analog input modules and Orion-M iSeries control systems.
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Data Logging: Each of the 128 devices, whether a mix of L Series, 100, 300 Series or other Future Design products, can have their data saved to the hard disk at user-defined rates. With up to 129 concurrent data log files, EnVision offers unparalleled data logging flexibility. Data file analysis tools (digital and trend) make looking at schedule run data a simple task
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L Series Specification Review
L91 Specification Review
- Power Input:
- 90-264VAC
- 11-26 VAC/11-36 VDC optional
- Input sample rate - 5 scans/second
- Input:
- Universal Thermocouple & RTD
- Special Order linear mA/VDC [FM approval applies only to units with thermocouple or RTD input]
- Event Input - Optional: Configurable as a Remote Reset or to Lock all parameters.
- 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 Form C [spdt]
- ssr driver: 5VDC/30mA
- Triac: 1A/240 VA
- Output #2 is available with one of the following options: Digital Output [relay, triac or ssr driver] transmitter power supply, communications and Event Input for remote reset & Lock.
- Digital Outputs are same as output #1 except relay is Form A [spst].
- Transmitter Power Supply [Isolated];
- 20 VDC/25mA
- 12 VDC/40mA
- 5 VDC/80mA
- Linear Retransmission:
- Process or Setpoint Values
- 0-5/1-5/0-10 VDC, 0-20/4-20mA
- RS485 Modbus Communication with access to all parameters.
- Configurable Display when not in alarm condition HSP, LSP, SP2, PV and word SAFE.
- When in Alarm display defaults to PV with output 1 annunciation energized.
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L41 Specification Review
- Power Input:
- 90-250VAC
- 11-26 VAC/11-36 VDC optional
- Input sample rate - 5 scans/second
- Input:
- Universal Thermocouple & RTD
- Special Order linear mA/VDC [FM approval applies only to units with thermocouple or RTD input]
- Event Input - Standard: Configurable as a Remote Reset or to Lock all parameters.
- 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 Form C [spdt]
- ssr driver: 5VDC/30mA
- Triac: 1A/240 VA
- Output #2 is available with one of the following options: Digital Output [relay, triac or ssr driver] or transmitter power supply..
- Digital Outputs are same as output #1
- Transmitter Power Supply [Isolated];
- 20 VDC/25mA
- 12 VDC/40mA
- 5 VDC/80mA
- Communication Options; RS485 Modbus or Retransmission
- Linear Retransmission:
- Process or Setpoint Values
- 0-5/1-5/0-10 VDC, 0-20/4-20mA
- RS485 Modbus Communication with access to all parameters.
- Upper Display shows Process Variable (temperature).
- Lower Display is configurable
- Non-alarm condition display is configurable to show the word SAFE or current Setpoint value.
- When process is in Alarm condition the lower display will show, dependent upon configuration, either SAFE or current Setpoint value
- When process goes from alarm to a non-alarm condition the lower display will revert to the configured non-alarm display; i.e. SAFE.
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