Dual or Quad Relay Option Boards for
Laureate™ Meters, Counters & Timers

Features

• Fits all 1/8 DIN Laureate DPMs, counters, timers & remote displays
• Choice of four relay output boards:
  1)  Two contact relays
  2)  Two solid state relays
  3)  Four contact relays
  4)  Four solid state relays
• Contact relays rated 8A at 250 Vac or 24 Vdc
• Solid state relays rated 130 mA at 140 Vac or 180 Vdc
• Outputs can be based on filtered or unfiltered signal input
• Responds in one reading or after programmable delay
• Selectable operating modes:
  1)  Output above or below setpoint
  2)  Latching or non-latching
  3)  Band deviation or hysteresis around each setpoint
• Setpoint setup via front panel pushbuttons or a PC
• Security lockout of front panel setpoint controls
• Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark), RoHS

Description

Electrocontact or Solid State Relays

Four optional plug-in setpoint controller boards are available to add control and alarm capability to 1/8 DIN Laureate DPMs, counters, timers and remote displays:

1)  Two contact relays
2)  Two solid state relays
3)  Four contact relays
4)  Four solid state relays

The contact relays are rated for 8A at 250 Vac or 24 Vdc and are recommended for high currents. The dual contact relays are mutually isolated Form C relays and can be wired to be normally open (NO) or normally closed (NC) when not energized. The quad contact relays are normally open (NO) Form A relays and share a common isolated ground in pairs.

The solid state relays are rated for 130 mA at 250 Vac or 24 Vdc and are recommended for low currents and frequent switching. They are Form A relays, which are normally open (NO) when not energized. As for the contact relays, the dual solid state relays are mutually isolated, and the quad solid state relays share a common isolated ground in pairs.

Operating Modes

• Operation above or below setpoint. Each relay may be individually programmed to be energized above or below a setpoint, or may be disabled.
   
• Latching or non-latching. Each relay may be individually programmed to operate in a latching or non-latching mode. In the latching mode, when an alarm or shutdown condition is reached, the output remains in the alarm condition until it is reset by front panel pushbuttons, via the serial interface, or via the rear connector. In the non-latching mode, the output is automatically reset when the alarm condition no longer exists.
   
• Band deviation mode. Each relay may be set to operate in a band deviation mode, where an alarm is generated whenever the reading is a specified number of counts above or below the setpoint. In particular, band deviation is ideal to flag an out-of-tolerance condition.
   
• Hysteresis mode. Each relay may be set to operate in a hysteresis mode, where turn-on occurs at a specified amount above the setpoint and turn-off occurs at the same amount below the setpoint.
   
• Filtered or unfiltered input. Relay action may be derived from either the filtered or unfiltered DPM input signals. Using the unfiltered signal improves response time, which is typically 17 ms for a DPM with the solid state relay board. Fast response time is one of the major strengths of Laureate DPMs, which can digitize analog data as often as 60 times per second. Using the filtered input reduces the chance of alarm triggering due to noise.
   
• Provisions for signal noise. A programmable time delay and reduction of relay chatter can be achieved in the DPM by selecting 1 to 128 readings in binary steps (17 ms to 2.1  s) prior to updating the output. Snubber circuitry is part of the contact relay board to prolong contact life. The relay response time of counters is controlled by a selectable gate time from 10 ms to 199.99 s.

Setpoint values and operating modes can be entered via front panel pushbuttons or by computer via the serial interface. Security lockout modes of the front panel pushbuttons can be set to allow operators to view and change setpoint values, view but not changes setpoint values, or not view nor change setpoint values. The Laureate Weight Meter and Batch Controller offer relay control modes beyond those of normal meter or counter operation.

Operation

Power
Setup
Input Filtering
Time Delay

Provided by meter
Front panel pushbuttons or via PC using RS232, RS485 or USB
Setpoint compared to either filtered or unfiltered signal.
Unfiltered, or programmable delay from 1 to 128 readings

Relay Operating Modes

1) Activate above or below setpoint
2) Latching or non-latching
3) Hysteresis or band deviation mode around each setpoint
4) Relays disabled

Enable/Lockout Modes

1) Display and change setpoint via front panel pushbuttons.
2) Display setpoints via alarm pushbutton, but do not allow changes.
3) Disable pushbutton action for setpoints.

Alarm Status Indication

Type
Lamp Lit

Two or four red LED indicators
When relay is energized

Contact Relay Versions

Form, Dual Relays
Form, Quad Relays
Current Rating
Safety Rating
Relay Grounds
 
Operate Time
Release Time

Form C, single-pole, double-throw (SPDT)
Form A, single-pole, single-throw (SPST), normally open (NO)
8A at 250 Vac or 24 Vdc
250V rms working, 2.3 kV rms per 1 min test
Grounds of dual relays are mutually isolated
Grounds of quad relays are isolated in pairs
7 ms (typical) from end of conversion
5 ms (typical) from end of conversion

Solid State Relay Versions

Form of Relays
Current Rating
ON series resistance
Isolation Type
Safety Rating
Operate & Release Time

Form A, single-pole, single-throw (SPST), normally open (NO)
130 mA at 140 Vac or 180 Vdc
18 ohms typical, 25 ohms max
Optical
250V rms working, 2.3 kV rms per 1 min test
1 ms (typical) from end of conversion

Environmental

Operating Temperature
Storage Temperature
Relative Humidity

0°C to 60°C
-40°C to 85°C
95% at 40°C, non-condensing

Normal, Non-Latched Operation

Latched Operation

Mixed Latched and Non-Latched Operation

One of the relays can operate in a non-latched mode, for instance to turn off a heater when an operating temperature setpoint is reached. The other relay can operate as a latching fail-safe backup and turn off the entire process when a second, higher setpoint is reached, indicating a malfunction.

Deviation Mode Operation

A deviation limit (50 in this example) is set up around both sides of the setpoint. The relay closes (or opens) when the reading falls within the deviation band, and opens (or closes) when the reading falls outside of this band. This mode sets up a passband around the setpoint and is often used for component testing.

Wide Hysteresis Mode Operation

In this example, a hysteresis limit of 600 is set below the setpoint. The relay closes when the reading reaches a lower limit (the setpoint less hysteresis) and opens when the reading reaches an upper limit (the setpoint).

One application is automatic tank filling. A fill operation is automatically initiated when the tank level has reached a lower level and is terminated when the level has reached an upper level.

Narrow Hysteresis Mode Operation

Hysteresis can be used to minimize the number of ON/OFF control cycles around a setpoint, thereby increasing the life of motors, relays, etc.

A very narrow hysteresis band (such as 5 counts) can also be used to minimize relay chatter around a setpoint due to electrical noise on the signal, or due to signal feedback caused by load switching. The hysteresis limit should exceed the noise amplitude.