Omega’s new DPF20 Series of indicators offer real flexibility for measurement of a wide range of frequency or pulse inputs. The display is easily configured to indicate frequency, rate, period or count. This makes the meter ideal for flow applications where they can display flow rate or total from a variety of different flow sensors. Or for quadrature signals, to indicate angular position or rotational speed and direction.

The DPF20 series offers exceptional performance at an economical price, with some unique and powerful features.

Feature	Description
Scaling	Multiply, divide and preset values
Alarms	configure a second setpoint in the same alarm, to create “alarm windows” configure independent activation and deactivation delays configure hysteresis configure alarm to activate as high or low failsafe function – normally closed relay requires activation for non-alarm condition latched alarms function – operator reset required Counter Reset, Stop or Continue Configurable hysteresis
Power up delay	Allows for a delay in the start-up time after powering the instrument. During this time the instrument performs no measurement or control. Ability to reset the display count on instrument start-up.
Display Brightness	Select from 5 levels of LED intensity.
Password	Password protect the configuration menu. This blocks access to the instrument set-up parameters, but the operator can still access set-point values.
Max / min memory	Front panel key selection of display minimum or maximum values
Sensor Type	The fast and simple way to configure a sensor. Select from a predefined list Eg. NPN, PNP, Namur, pick-up, inductive, etc. The instrument will automatically configure the required parameters for the selected sensor (pull-up / pull-down resistors, trigger level, excitation voltage, etc)
Trigger sense	Simple selection of the optimal trigger level for the sensor input. The display indicates up or down reflecting the status of the input signal level. When the LED changes state continuously the optimal trigger level has been achieved.

Specifications
Main Functions: Counter, ratemeter, period meter
Display Digits: 6
Display Range: 999999/-199999
Decimal Point: Configurable
LED Color: Red standard; green optional
Digit Height: 14 mm (0.55")
Signals Accepted: NPN, PNP, Namur, pick-up, TTL, inductive, mechanical, quadrature
Excitation Voltage: 5 Vdc, 9 Vdc, 15 Vdc, 18 Vdc (max. 70 mA)
Maximum Vdc at Input Terminals: ±30 Vdc
Input Impedance: 2.4 kO with pull-up or pull-down resistor; 470 k without resistor
Quartz Accuracy: ±0.01%
Thermal Stability: 20 ppm/ºC
Display Refresh: 15/second
Maximum Frequencies:
    Counter: Up to 250 KHz
    Ratemeter and Period Meter: Up to 500 KHz
Minimum Frequencies: Down to 1 mHz (0.001 Hz) (ratemeter and period meter)
Standard Power: 85 to 265 Vac/DC (isolated 2,500 Vac)
Low Power: 11 to 60 Vdc and 24/48 Vac (isolated 1500 Vac)
Power Consumption: <1.5 W (meter only); < 4.0 W (meter with options)
Connections: Plug-in screw terminal
Slow Function: For low frequency rate meter applications
Fast Function: For high frequency counter applications
Scaling Factor: Multiplier and divider from 1 to 999999
Configurable Reset: Front panel and rear remote reset, and reset linked to alarm activation
Preset: Configurable
Retention Memory: Recovers count value in case of power loss
Dimensions and Environment
Weight: <150 grams (<5.3 oz)
Front Panel Size: 96 x 48 mm (3.78 x 1.89")
Panel Cut-Out: 92 x 44 mm (3.62 x 1.73")
Depth Behind Panel: 91 mm (3.58") including terminals
Operating Temperature: 0 to 50ºC (32 to 122ºF)
Storage Temperature: -20 to 70ºC (-4 to 158ºF)
Warm Up: 15 minutes
Front Panel Protection: NEMA 4 (IP65)