R H Designs Processmaster II

Mark Layne

Subscriber
Joined
Jun 9, 2003
Messages
967
Location
Nova Scotia
Format
Medium Format
I just purchased one of these from Richard Ross. It seems to be an excellent developing timer and has certainly replaced a monstrous old Tandy computer I was using and will compensate for temperature fluctuations as well
Mark
 

Ross Chambers

Member
Joined
Apr 26, 2004
Messages
701
Location
Blue Mountai
Format
Multi Format
Thanks for the tip Mark. I checked the RH site and I'm highly likely to buy one. I like the 30 sec agitation beep and the percentage N+ or N- capacity too. I'm just awaiting confirmation that open tray development is OK with a light source around, although apparently it turns off the lights after 30 seconds. The footswitch sounds a real bonus, too.

Regards - Ross
 
OP
OP

Mark Layne

Subscriber
Joined
Jun 9, 2003
Messages
967
Location
Nova Scotia
Format
Medium Format

It also beeps down the final 15 sec of each step
 

RH Designs

Advertiser
Advertiser
Joined
Apr 9, 2003
Messages
651
Location
Yorkshire Da
Format
Multi Format
Ross Chambers said:
I'm just awaiting confirmation that open tray development is OK with a light source around, although apparently it turns off the lights after 30 seconds.
Click to expand...

Providing the display lights don't fall directly on the film you should be OK - see Les McLean's posting (there was a url link here which no longer exists)

The display switches off after 30 seconds in stand-by but not when counting, to save the battery; this function can be disabled.

The "final countdown" is indeed 10sec, not 15. I was overruled by the software man . If you have a large tank that takes more than 10sec to empty, I wouldn't worry about it as a few seconds are unlikely to make any difference to a development time of several minutes.
 

jeroldharter

Member
Joined
Nov 6, 2005
Messages
1,955
Location
Wisconsin
Format
4x5 Format
Does the timer have a "Count Up" function?

If so, is that compatible with the automatic temperature adjustment?

I ask because when I develop BTZS tubes, I put my Gralab timer in count up mode and then remove the tubes sequentially from the shortest to longest development times, and hold them all in stop bath until moving on. It would be a nice convenience if I could do the same thing but with temperature compensation.
 

RH Designs

Advertiser
Advertiser
Joined
Apr 9, 2003
Messages
651
Location
Yorkshire Da
Format
Multi Format
jeroldharter said:
Does the timer have a "Count Up" function?

If so, is that compatible with the automatic temperature adjustment?
Click to expand...

Yes it does, optionally, and it is. If that mode is set, once the countdown has expired the timer will count up from zero until twice the original time has been reached. In conjunction with this the % display mode shows what percentage of the original time remains ( -ve display) or has elapsed since timeout (+ve display). You can swap between % and seconds at any time without affecting the count.

What it doesn't do is to optionally count upwards instead of downwards from the start, which if I understand correctly is what your Gralab is doing. I'm sure you could adapt your working method to the way the PM II works - maybe set countdown to the shortest dev time required, and then it will count up from the expiry of that period.
 
You must log in or register to reply here.
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…