Diffstak 250/2000P, 230-250 V, 1Ø, 50/60 Hz

The compact water-cooled Diffstak pumps with an integral cooled baffle offer exceptionally clean pumping with very low backstreaming, reduced outgassing, and a reduction in the number of elastomer seals required for installation.

The Edwards Diffstak 250 (ISO250 inlet) design has been proven over many years with thousands of pumps installed. 

This pump has a pneumatically actuated high vacuum isolation valve and is supplied with: NW40 elbow, NW40 centering-ring, NW40 clamp, water pipe couplings and ferrules, inlet ISO 250 trapped ‘O’ ring.

Pumping speed
nitrogen	2000 l s-1
hydrogen	3000 l s-1
Min backing pump displacement*	40 m3h-1
Recommended backing pump	E2M40
Recommended fluid	Santovac® 5
Fluid charge (dry)	500 ml
Inlet connection compatible with	ISO250
Backing connection	NW40
Cooling water connection	10 mm compression fittings
Heater power	2.25 kW
Min cooling-water flow at 20°C	180 l h-1
Pneumatic connections†	6mm coupling x ¼ BSP male stud
Pneumatic actuating pressure
Minimum	2.4bar / 35psi
Maximum	6.9bar / 100psi
Weight
250/2000M	59kg
250/2000P	60kg

* For maximum throughput
^† 250/2000P only