npi electronic PEXT
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npi electronic PEXT

PEXT - Extracellular Amplifier and Drug Ejection is designed for pressure ejection of drugs in physiological and pharmacological studies while recording extracellular signals.

It combines the popular PDES pressure ejectors with the extracellular amplifier EXT-02F/1 in one 19" instrument that can easily be mounted in a rack.

npi electronic PEXT
Pressure ejection of substances can be performed with the same pipette as extracellular recording at the same position, or at a distant site using a separate pipette

2 or 4 bar pneumatic output

Digital manometer with pressure monitor

Digital timer (100 is to 9999.9 ms) for pressure ejection

Manual, internal timed or external (TTL) pneumatic operation

Differential amplifier input with high impedance

Input with BNC connectors or small headstage

Offset control potentiometer with two ranges (±0.1V or ±1V)

Lowpass filter: 30, 100, 300, 500, 700, 900, 1.3k, 1.5k, 1.7k, 3k, 10k, 20k Hz

Highpass filter: OFF, 3, 30, 100, 300, 400, 500, 600, 800, 1k, 3k, 10k Hz

Output: DC or AC filtered x10 to x10k

Optional audio monitor, noise mode with threshold or pitch mode

Over LEDs (activating at 10% below maximum output)

Analog balance monitor for optimal offset control

Two separate holders for ejection and recording or one combined ejection/recording pipette holder

Mode selection
Mode selection
Three position toggle switch, (Timer, Cont., Ext.)
Source gas
Source gas
Air, nitrogen, helium etc. No aggressive, combustible or explosive gases, filtered by a 5 µm filter element
Pressure range
Pressure range
Input pressure: max. 5 bar (1 bar = 105 pa = 14.5 psi), pressure control range: 0-4 bar, 0-58 psi; with microject 0-2 bar, 0-30 psi, display range: 0-4 bar, 0-58 psi, residual air pressure: 10 mbar (0.145 psi) - 100 mbar (1.45 psi)
Input and output couplings
Input and output couplings
Quick connect type
Digital timer
Digital timer
100 µs - 9.9 s set by five digit tumble-wheel switch (0000.1 - 9999.9 ms)
Analog timer
Analog timer
0.1 - 1 s and 1 - 10 s with linear control, range set by toggle switch time base selector (0.1 s, 1 s)
Minimum pressure pulse length
Minimum pressure pulse length
10 ms (digital timer), <1 ms with microject, 100 ms (analog timer)
Pulse output
Pulse output
Pressure Monitor: standard BNC connector, sensitivity: 1 V / bar or 0.1 V / psi, output impedance 249 Ω, timing Monitor: standard BNC connector, TTL (LO = 0-1 V, HI = 5 V), output impedance 249 Ω
Pulse input
Pulse input
Standard BNC connector, TTL (LO = 0-2.5 V, HI = 2.5-12 V), input impedance 10 kΩ
Status/eject time indicator
Status/eject time indicator
Red/green LED, red light: channel has been turned on, valve is closed, green light: valve is open
Power requirements
Power requirements
115/230 V AC, 20-40 W
Dimensions
Dimensions
19" rackmount cabinet, 19" (483 mm), 10" (250 mm), 3.5" (88 mm)
Remote control (option)
Remote control (option)
Toggle switch and status LED for each channel
Size: 25 x 40 x 100 mm