Peak/Valley Hold Unit (PVHU)

The PVHU has one input and two outputs which can be used to capture the maximum (peak) and minimum (valley) values of the input signal. The PVHU captures the maximum and minimum values and holds these values until either another maximum or minimum value is detected, or the RESET TIME expires. The Reset Time can be adjusted from 0% to 100% (using a trimpot) in three ranges: 4 to 100 mS, 4 to 1000 mS and 4 mS to 10 S.

There is an additional option to hold the peak and valley outputs until an external digital input resets the captured values.

The PVHU has four way galvanic isolation of 1000 VDC between the Power In, the input and each output. The outputs are isolated from each other.

A variety of standard signal inputs and outputs can be accommodated:

• Current (DC): 4-20 mA, 0-20 mA, (factory installed options are 0-1 A, 0-5 A and 0-10 A).
• Loop power available at +15 V, 22 mA for loop powered transmitter inputs.
• Voltage (DC): 0-100 mV, 0-1 V, 0-2 V, 0-10 V, 0-30 V, 0-100 V and ±10 V.
• Resistance: 0-100 Ω, 0-1 kΩ, 0-10 kΩ.

There is also an option to be able provide 15 V at 30 mA to supply power for a loop powered input sensor or transmitter.

The outputs can be different from each other and also different to the input, so the unit can effectively
perform signal conversion and isolation functions as well. Special input and output ranges can be provided
by arrangement.

The unit has two analogue outputs with various options:

• Current (DC): 4-20 mA, 0-20 mA.
• Voltage (DC): 0-100 mV, 0-1 V, 0-10 V, ±10 V.

As well as some digital I/O options:

• Relay Outputs - optional: Two alarm relay outputs 30 VDC at 1 A / 125 VAC, 0.3 A.
• Digital Outputs - optional: Two opto-isolated transistor outputs up to 50 V at 40 mA maximum.
• Digital Inputs - optional: Two opto-isolated digital inputs 30 V maximum at 5 mA.

Please contact us with your specific requirements to see how we can adapt this instrument to suit your application. Email Mike....