PDES-Series

PDES-2DX-LA
PDES-2DX

npi PDES units are designed for pressure ejection of drugs in physiological and pharmacological studies. PDES systems can be equipped with high pressure outputs (up to Pmax = 4 bar / 87 psi) for drug application with fine-tipped micropipettes or with low-range pressure output (Pmax = 0.7 bar / 10 psi) for controlled droplet application from large-tipped pipettes. Analog (standard) or digital timers (optional) and a remote control unit facilitate the use of these instruments.

There is also a modular version of the PDES available.

About PDES

PDES-2DX-LA
PDES-2DX

Pressure ejection is a convenient method for applying both ionic and non-ionic solutions from micropipettes. First, it can apply to almost all solutions. Second, the amount of the ejected solution can be monitored by viewing the tip of the micropipette under a microscope. npi PDES units are designed for pressure ejection of drugs in physiological and pharmacological studies. PDES systems can are equipped with pressure outputs ( Pmax = 4 bar (58 psi) or 2 bar (29 psi)) for drug application with micropipettes. Analog or digital timers and a remote control unit facilitate the use of these instruments. They are available with one or two application channels. One channel instruments can also be equipped with a retain channel. All PDES units can be operated with internal valves as well as with external valves to reduce the minimal application time to less than one millisecond.

Each channel consists of a precision pressure regulator, pressure display, electronically controlled valves, control electronics, and a regulated power supply. Ejection of drugs can be activated manually or through a TTL input. The operational status is indicated by a red / green LED. Each system is equipped with a monitor BNC connector that reflects the opening time of the pressure valve. In digital systems the pressure is monitored at a BNC connector as well (1 V / bar or 0.1 V / psi).

Features

  • High pressure output for fine tipped micropipettes
  • Low-range pressure output for large tipped pipettes
  • Analog or digital timers
  • Anaolg or digital manometers
  • Remote control available
  • One or two channels versions (one channel versions can be upgraded)
  • External valves for fast applications available (< 1 ms)
  • System with holding pressure available

Also available as module for the EPMS-07 system.

PDES - Models

In this graphic, all possible combinations of PDES are depicted.

Ordering

The various configurations of PDES systems are reflected in the part number

PDES-0X-(U)Y(E)-M-LA-Z

where:
X = number of channels (1 or 2)
U = upgrade
Y = type of timer (T=analog; D=digital)
E = configuration with external valve(s), blank = configuration with internal valve(s)
M = module
LA = configuration with digital display(s), blank = configuration with analog display(s)
Z = maximum pressure (2 bar [29 psi] or 4 bar [58 psi])

External valve options:

  • PDES-0X-BOX (for “slow” valves [ca. 10 ms])
    where:
    X = number of channels (1 or 2)
  • PDES-EHM (for “fast” microJECT valves [<1 ms])
    for one channel

Technical Data

MODE SELECTION:
three position toggle switch, (TIMER, CONT., EXT.).

SOURCE GAS:

air, nitrogen, helium etc. no aggressive, combustible or explosive gases, filtered by a 5 µm filter element.

PRESSURE RANGE:
input pressure: max. 5 bar (1 bar = 100 kPa = 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:
quick connect type.

DIGITAL TIMER:
100 µs - 9.9 s set by five digit tumble-wheel switch
(0000.1 - 9999.9 ms).

ANALOG TIMER:
0.001 - 0.1 s, 0.01 - 1 s, 0.1 - 10 s and 1 - 100 s with linear control, range set by 4-postion toggle switch.

VALVE SWITCHING TIME:
15-20 ms (standard valves), <1 ms with microJECT

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:
standard BNC connector, TTL (LO = 0-2.5 V, HI = 2.5-5 V), input impedance 10 kΩ.

STATUS / EJECT TIME INDICATOR:
red/green LED
red light: channel has been turned on, valve is closed
green light: valve is open.


POWER REQUIREMENTS:
115/230 V AC, 20-40 W,

DIMENSIONS:
19" rackmount cabinet, 19" (483 mm), 10" (250 mm), 3.5" (88 mm)

REMOTE CONTROL (OPTION):
Toggle switch and status LED for each channel,
size: 25 x 40 x 100 mm.